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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Plant Sci.</journal-id>
<journal-title>Frontiers in Plant Science</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Plant Sci.</abbrev-journal-title>
<issn pub-type="epub">1664-462X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fpls.2024.1377793</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Plant Science</subject>
<subj-group>
<subject>Review</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Regulatory mechanisms of plant rhizobacteria on plants to the adaptation of adverse agroclimatic variables</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" equal-contrib="yes">
<name>
<surname>Verma</surname>
<given-names>Krishan K.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn003">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author" equal-contrib="yes">
<name>
<surname>Joshi</surname>
<given-names>Abhishek</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="author-notes" rid="fn003">
<sup>&#x2020;</sup>
</xref>
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<contrib contrib-type="author" corresp="yes">
<name>
<surname>Song</surname>
<given-names>Xiu-Peng</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
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<contrib contrib-type="author">
<name>
<surname>Liang</surname>
<given-names>Qiang</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Xu</surname>
<given-names>Lin</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Huang</surname>
<given-names>Hai-rong</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Wu</surname>
<given-names>Kai-Chao</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Seth</surname>
<given-names>Chandra Shekhar</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
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<contrib contrib-type="author">
<name>
<surname>Arora</surname>
<given-names>Jaya</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
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</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Li</surname>
<given-names>Yang-Rui</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
<xref ref-type="author-notes" rid="fn004">
<sup>&#x2021;</sup>
</xref>
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<aff id="aff1">
<sup>1</sup>
<institution>Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/Guangxi Key Laboratory of Sugarcane Genetic Improvement</institution>, <addr-line>Nanning</addr-line>, <country>China</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Botany, Mohanlal Sukhadia University</institution>, <addr-line>Udaipur, Rajasthan</addr-line>, <country>India</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Department of Botany, University of Delhi</institution>, <addr-line>Delhi</addr-line>, <country>India</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by: Dinesh Yadav, Deen Dayal Upadhyay Gorakhpur University, India</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by: Suresh Kaushik, Retired, New Delhi, India</p>
<p>Rupali Gupta, Volcani Center, Israel</p>
</fn>
<fn fn-type="corresp" id="fn001">
<p>*Correspondence: Xiu-Peng Song, <email xlink:href="mailto:xiupengsong@gxaas.net">xiupengsong@gxaas.net</email>; Yang-Rui Li, <email xlink:href="mailto:liyr@gxaas.net">liyr@gxaas.net</email>
</p>
</fn>
<fn fn-type="equal" id="fn003">
<p>&#x2020;These authors have contributed equally to this work</p>
</fn>
<fn fn-type="other" id="fn004">
<p>&#x2021;ORCID: Yang-Rui Li, <uri xlink:href="https://orcid.org/0000-0002-7559-9244">orcid.org/0000-0002-7559-9244</uri>
</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>23</day>
<month>05</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>15</volume>
<elocation-id>1377793</elocation-id>
<history>
<date date-type="received">
<day>28</day>
<month>01</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>07</day>
<month>05</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2024 Verma, Joshi, Song, Liang, Xu, Huang, Wu, Seth, Arora and Li</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Verma, Joshi, Song, Liang, Xu, Huang, Wu, Seth, Arora and Li</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>The mutualistic plant rhizobacteria which improve plant development and productivity are known as plant growth-promoting rhizobacteria (PGPR). It is more significant due to their ability to help the plants in different ways. The main physiological responses, such as malondialdehyde, membrane stability index, relative leaf water content, photosynthetic leaf gas exchange, chlorophyll fluorescence efficiency of photosystem-II, and photosynthetic pigments are observed in plants during unfavorable environmental conditions. Plant rhizobacteria are one of the more crucial chemical messengers that mediate plant development in response to stressed conditions. The interaction of plant rhizobacteria with essential plant nutrition can enhance the agricultural sustainability of various plant genotypes or cultivars. Rhizobacterial inoculated plants induce biochemical variations resulting in increased stress resistance efficiency, defined as induced systemic resistance. Omic strategies revealed plant rhizobacteria inoculation caused the upregulation of stress-responsive genes&#x2014;numerous recent approaches have been developed to protect plants from unfavorable environmental threats. The plant microbes and compounds they secrete constitute valuable biostimulants and play significant roles in regulating plant stress mechanisms. The present review summarized the recent developments in the functional characteristics and action mechanisms of plant rhizobacteria in sustaining the development and production of plants under unfavorable environmental conditions, with special attention on plant rhizobacteria-mediated physiological and molecular responses associated with stress-induced responses.</p>
</abstract>
<kwd-group>
<kwd>adverse agroclimatic conditions</kwd>
<kwd>physiological and omic aspects</kwd>
<kwd>plant responses</kwd>
<kwd>plant hormones</kwd>
<kwd>agricultural sustainability</kwd>
<kwd>rhizobacteria</kwd>
</kwd-group>
<counts>
<fig-count count="1"/>
<table-count count="2"/>
<equation-count count="0"/>
<ref-count count="147"/>
<page-count count="12"/>
<word-count count="5355"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-in-acceptance</meta-name>
<meta-value>Plant Symbiotic Interactions</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<title>Introduction</title>
<p>Plant rhizobacteria-mediated abiotic stress reduction occurs directly through hormone induction or indirectly via signaling in the host plant. The direct function in nitrogen fixation, phosphate solubilization, auxin, cytokinin, gibberellin, and abscisic acid production are all documented. It also makes it easier for necessary mineral elements to be absorbed from the rhizospheric soil along with the production of plant growth regulators. However, the indirect roles include the production of metabolites, siderophores, antibiotics, volatile HCN, etc. Some of the compounds that the microbes may produce include deaminase enzyme, microbiocidal enzyme, siderophores, plant hormones, and PO<sub>4</sub>-solubilizing enzyme (<xref ref-type="bibr" rid="B54">Gujral et&#xa0;al., 2013</xref>; <xref ref-type="bibr" rid="B32">Ekinci et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B109">Saleem et&#xa0;al., 2015</xref>; <xref ref-type="bibr" rid="B78">Kumari and Khanna, 2016</xref>; <xref ref-type="bibr" rid="B92">Moustaine et&#xa0;al., 2017</xref>). Plants have unique microbiota, and the microbial structure in the rhizosphere is influenced by the bacteria and plants&#x2019; production of signal molecules and the chemical composition of root exudates (<xref ref-type="bibr" rid="B145">Zhang et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B62">Jalmi and Sinha, 2022</xref>). Plant-growth regulators, phytohormones, and various secondary metabolites can be produced by PRs to stimulate plant development (<xref ref-type="bibr" rid="B60">Islam et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B69">Kaushal and Wani, 2016</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>).</p>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>Schematic representation of PRs-mediated abiotic and biotic stress resistance mechanism in plants. ABA, abscisic acid; JA, jasmonic acid, GA, gibberellins, IAA, indole-3-acetic acid, SA, salicylic acid, EPS, exopolysaccharides, HCN, hydrogen cyanide; ACCD, 1-aminocyclopropane-1-carboxylate deaminase; SOD, superoxide dismutase; CAT, catalase; PAL, phenylalanine ammonia-lyase; APX, ascorbate peroxidase; POD, peroxidase; ASC, ascorbate; PPO, polyphenol oxidase; GPX, glutathione peroxidase; GR, glutathione reductase; Pas, polyamines; TPC, total phenolic content; PL, proline; SS, soluble sugar; HSPs, heat shock proteins; HKT&#x2014;High-affinity K<sup>+</sup> transporters; <italic>expA1,</italic> expansin<italic>; TPC1,</italic> calcium transporter; ADC1 and ADC2, putrescine synthesis; <italic>OsPCS1, </italic> phytochelatin synthase; <italic>OsMTP1,</italic> gene related to metal transport; <italic>OsMTP5</italic>, gene related to expulsion of excess metal<italic>; trpAa</italic>, and <italic>trpEa,</italic> genes related to tryptophan biosynthesis; <italic>betA</italic> and <italic>betB</italic>, genes related to betaine biosynthesis; <italic>GmVSP</italic> and <italic>GmPHD2,</italic> stress responsive genes; <italic>GSL1,</italic> gene related to cell wall synthesis; V-ATPase, Vacuolar-H<sup>+</sup> -pyrophosphatase; LEA, late embryogenesis abundant; NCED, WZE and SAMS = transcription factors.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpls-15-1377793-g001.tif"/>
</fig>
<p>The upregulated synthesis of metabolites, such as phytohormone, exopolysaccharides, siderophores, antioxidant enzymes, and volatile compounds, primarily minimizes plant resistance to environmental challenges. The production of phytohormones by rhizobacteria-inoculated plants, including cytokinins (CK), gibberellic acid (GA), indole-3-acetic acid (IAA), and abscisic acid (ABA) is employed during plant stressed conditions. 1-aminocyclopropane-1-carboxylate (ACC) deaminase plays a significant role in conferring stress resistance capacity to plants by downregulating the level of stress-induced ethylene level in plant roots system (<xref ref-type="bibr" rid="B38">Etesami and Maheshwari, 2018</xref>; <xref ref-type="bibr" rid="B116">Shahid et&#xa0;al., 2023</xref>). Plant-rhizobacteria downregulated the effects of abiotic stresses by modifying the expression of genes associated with the biosynthesis of hormones, i.e., <italic>ACO</italic> and <italic>ACS</italic> genes (ethylene biosynthesis), <italic>MYC2</italic> (Jasmonate), <italic>PR1</italic> (SA), genes encoding antioxidant enzymes, transcription factor <italic>NAC1</italic>, etc. (<xref ref-type="bibr" rid="B129">Tiwari et&#xa0;al., 2017</xref>) (<xref ref-type="table" rid="T1">
<bold>Tables&#xa0;1</bold>
</xref>, <xref ref-type="table" rid="T2">
<bold>2</bold>
</xref>). Extensive field trials are required to investigate the interaction between the functional activities of signaling networks and their association. The interaction between PRs and plants based on various factors, such as root composition, strains of bacteria, and exudation patterns from their roots (<xref ref-type="bibr" rid="B76">Kumar et&#xa0;al., 2019</xref>). Numerous secondary metabolites and root exudates depend as chemo-attractants in the rhizosphere, attracting beneficial soil bacteria and inhibiting phytopathogens, thereby stimulating a delicate network of signaling between microbes and plants (<xref ref-type="bibr" rid="B130">Ullah et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B66">Joshi et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>; <xref ref-type="bibr" rid="B65">Joshi et&#xa0;al., 2023</xref>). The physiological and molecular responses activated in plants in response to stress resistance are regulated by various key genes with metabolic and regulatory roles. Research demonstrations focusing on plant gene expression following plant-rhizobacteria inoculation may help understand which can be an effective environmentally friendly approach to alleviate the adverse environmental variables (<xref ref-type="bibr" rid="B43">Ferrante et&#xa0;al., 2023</xref>; <xref ref-type="bibr" rid="B135">Verma et&#xa0;al., 2023</xref>). The formation of the enzyme ACC deaminase by rhizobacteria and reduction in ethylene level had been the main function for enhanced plant growth and resistance ability during different stresses (<xref ref-type="bibr" rid="B16">Bharti et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B62">Jalmi and Sinha, 2022</xref>).</p>
<table-wrap id="T1" position="float">
<label>Table&#xa0;1</label>
<caption>
<p>PR-mediated abiotic stress reduction in crop plants and their tolerance mechanism.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="top" align="left">Stress condition</th>
<th valign="top" align="left">Plant</th>
<th valign="top" align="left">PR strains</th>
<th valign="top" align="left">PRs-mediated possible tolerance mechanism</th>
<th valign="top" align="left">Source</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Cold</td>
<td valign="top" align="left">Tomato</td>
<td valign="top" align="left">
<italic>Streptomyces</italic> sp. TOR3209</td>
<td valign="top" align="left">Upregulation of genes related to biosynthesis of abscisic acid (ABA), stress-related metabolism and photosynthesis</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B83">Ma et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Cold</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Lysinibacillus fusiformis</italic> YJ4<italic>, L. sphaericus</italic> YJ5</td>
<td valign="top" align="left">Upregulation of genes related to osmolytes, phenolic content, superoxide dismutase (SOD), catalase (CAT), phenylalanine ammonia-lyase (PAL), indole-3-acetic acid (IAA), and gibberellic acid (GA<sub>3</sub>)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B64">Jha and Mohamed, 2023b</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Cold</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Bacillus</italic> spp. CJCL2, <italic>B. velezensis</italic> FZB42</td>
<td valign="top" align="left">Downregulation of ABA and lipid peroxidation encoding genes <italic>ABARE</italic> and <italic>4-HNE</italic>, upregulation of gene related to Expansin <italic>(expA1)</italic>, Cytokinin <italic>(CKX2)</italic>, and Auxin <italic>(ARF)</italic>
</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B147">Zubair et&#xa0;al., 2019</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Drought</td>
<td valign="top" align="left">Barley</td>
<td valign="top" align="left">
<italic>Providencia rettgeri</italic>
</td>
<td valign="top" align="left">Increased production of IAA, siderophores (SDP), proline(PL), exopolysaccharides (EPS), and reduced level of malondialdehyde (MDA)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B42">Ferioun et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Drought</td>
<td valign="top" align="left">Chickpea</td>
<td valign="top" align="left">
<italic>Stenotrophomonas</italic> sp. CV83</td>
<td valign="top" align="left">Upregulation of genes related to antioxidant enzymes SOD, POD, ascorbate peroxidise (APX), and lipoxygenase</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B118">Sharma et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Drought</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Cronobacter</italic> sp.Y501</td>
<td valign="top" align="left">Constrain ABA signaling, increase IAA biosynthesis, decrease MDA, SOD, CAT, peroxidase (POD) activity</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B46">Gao et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Drought</td>
<td valign="top" align="left">Rice</td>
<td valign="top" align="left">
<italic>Pseudomonas putida</italic> AKMP7</td>
<td valign="top" align="left">Polyamines (PAs)homeostasis through biosynthesis, back-conversion and catabolism of PAs</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B97">Nikhil et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Drought</td>
<td valign="top" align="left">Soybean</td>
<td valign="top" align="left">
<italic>Bacillus pumilus</italic>
<break/>SH-9</td>
<td valign="top" align="left">Downregulation of ABA, upregulation of SOD, POD, APX, glutathione (GSH), EPS and SPD</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B114">Shaffique et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Drought</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Enterobacter bugandensis</italic> WRS7</td>
<td valign="top" align="left">Overexpression of genes related to antioxidants (<italic>CAT</italic>, <italic>APX</italic>, <italic>GPX</italic>), osmolyte (<italic>P5CS</italic>, <italic>P5CR</italic>, <italic>TPS1</italic>), stress hormone (<italic>NCED, WZE, SAMS, ACS1</italic>) and <italic>ACO</italic> encoding proteins for ABA, ethylene, and calcium transporter (<italic>TPC1</italic>)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B8">Arora and Jha, 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heat</td>
<td valign="top" align="left">Tomato</td>
<td valign="top" align="left">
<italic>Bacillus safensis SCAL1</italic>
</td>
<td valign="top" align="left">Increased level of ACCD, EPS, IAA, gibberellic acid (GA<sub>3</sub>), kinetin, SOD, CAT, POD</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B93">Mukhtar et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heat</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Bacillus</italic> spp. AH-08, AH-67, SH16 and <italic>Pseudomonas</italic> spp.<break/>SH-29</td>
<td valign="top" align="left">Upregulation of heat shock proteins (HSP1, <italic>HSP18, HSP70, HSP101</italic>), CAT, POD, and carotenoids</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B4">Ahmad et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heat</td>
<td valign="top" align="left">Mustered</td>
<td valign="top" align="left">
<italic>Bacillus aryabhattai</italic> NSRSSS-1<italic>, B. licheniformis</italic> SSA 61, <italic>Bacillus</italic> sp. MRD-17</td>
<td valign="top" align="left">Increased production of IAA, GA, CAT, SOD, APX, phenolic content and reduction in PL, and soluble sugar (SS)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B74">Kiruthika et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heat</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Bacillus safensis</italic>
</td>
<td valign="top" align="left">Elicited expression of ADC1 and ADC2 linked to putrescine synthesis, modulated expressions of HSPs, upregulate redox enzymes and antioxidants associated with ascorbate (ASC)-GSH cycle, enhanced GB, SS, and phenols</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B112">Sarkar et&#xa0;al., 2021</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heavy metal</td>
<td valign="top" align="left">Barley</td>
<td valign="top" align="left">
<italic>Rhodospirillum</italic> sp. JY3</td>
<td valign="top" align="left">Enhanced production of POX, CAT, SOD, GSH, ASC, polyphenols, phytochelatins, glutaredoxin, thioredoxin, peroxiredoxin</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B6">Alsiary et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heavy metal</td>
<td valign="top" align="left">Barley</td>
<td valign="top" align="left">
<italic>B. glycinifermentans</italic>
<break/>IS-2</td>
<td valign="top" align="left">Modulation of endogenous phytohormones and uptake of essential elements (K, P)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B15">Belhassan et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heavy metal</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Agrococcus terreus</italic> (MW 979614)</td>
<td valign="top" align="left">Augmented levels of antioxidant enzymes (SOD, POD), and nutrient uptake</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B117">Shahzad et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heavy metal</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Serratia</italic> CP-13</td>
<td valign="top" align="left">Upregulate IAA, osmolytes (SS, PL), antioxidants and downregulate MDA, ABA, and Cd uptake</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B125">Tanwir et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heavy metal</td>
<td valign="top" align="left">Rice</td>
<td valign="top" align="left">
<italic>Serratia marcescens</italic> DB1</td>
<td valign="top" align="left">Decreased expression of genes related to phytochelatin synthase (<italic>OsPCS1)</italic>,metal transport <italic>(OsMTP1)</italic>, expulsion of excess metal (<italic>OsMTP5)</italic>
</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B19">Bhatta et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Heavy metal</td>
<td valign="top" align="left">Tomato</td>
<td valign="top" align="left">
<italic>Serratia</italic> sp. D23, <italic>Sphingomonas</italic> sp.</td>
<td valign="top" align="left">Upregulation of defense genes (<italic>Hsp90</italic>, <italic>MT2</italic> and <italic>Nramp 3</italic>)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B138">Wei et&#xa0;al., 2022</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Barley</td>
<td valign="top" align="left">
<italic>Siccibacter</italic> sp. C2</td>
<td valign="top" align="left">Overexpression of <italic>HVA1</italic>,<break/>
<italic>HvDREB1, HvWRKY38</italic>, <italic>HvP5CS</italic> genes</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B113">Sayahi et&#xa0;al., 2022</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Chickpea</td>
<td valign="top" align="left">
<italic>Bacillus</italic> sp. BSE01</td>
<td valign="top" align="left">Maintained levels of ACC, ABA and K<sup>+</sup>/Na<sup>+</sup> ratio, enhanced production of, antioxidant enzyme, PL and decreased activity of NADPH oxidase</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B14">Basu et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Lettuce</td>
<td valign="top" align="left">
<italic>Bacillus velezensis</italic>
<break/>JB0319</td>
<td valign="top" align="left">Induce SOD, POD activity and decreased MDA</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B13">Bai et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Pseudomonas</italic> sp. MHR6</td>
<td valign="top" align="left">Induce production of EPS, reduce MDA and electrolyte leakage (EL)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B81">Liu et&#xa0;al., 2022</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Mustered</td>
<td valign="top" align="left">
<italic>Pseudomonas fluorescens</italic>
</td>
<td valign="top" align="left">Augmented production of glycine-betaine (GB), PL, SOD, CAT, APX and GR</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B71">Khan et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Oat</td>
<td valign="top" align="left">
<italic>Bacillus</italic> sp. LrM2</td>
<td valign="top" align="left">Induced production of ACCD, non&#x2013;enzymatic antioxidants, ASC, GSH, dehydroascorbate</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B144">Zhang et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Rice</td>
<td valign="top" align="left">
<italic>Pseudomonas promysalinigen</italic> RL-WG26</td>
<td valign="top" align="left">Induce biosynthesis of tryptophan (<italic>trpAa, trpB, trpC, trpD, trpEa</italic>), IAA (<italic>iaaM, iaaH</italic>), betaine (<italic>betA, betB, betT</italic>) and inhibit ethylene biosynthesis (acdS) related transcripts</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B106">Ren et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Rice</td>
<td valign="top" align="left">
<italic>Lysinibacillus fusiformis, L. sphaericus, Brevibacterium pityocampae</italic>
</td>
<td valign="top" align="left">Increased expression of JA,<italic>OsNHX1</italic>,<italic>OsAPX1</italic>, <italic>OsPIN1, OsCATA</italic> gene and reduced expression of ABA, salicylic acid (SA), and <italic>OsSOS</italic> gene</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B10">Asif et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Soybean</td>
<td valign="top" align="left">
<italic>Streptomyces lasalocidi</italic> JCM 3373</td>
<td valign="top" align="left">Induce expression of indole-3-carboxaldehyde (ICA1d), expression of stress-responsive genes (<italic>GmVSP, GmPHD2</italic>, <italic>GmWRKY54)</italic> and root growth related genes (<italic>GmPIN1a, GmPIN2a, GmYUCCA5</italic>,<break/>
<italic>GmYUCCA6)</italic>
</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B82">Lu et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Tomato</td>
<td valign="top" align="left">
<italic>Bacillus halotolerans</italic>
<break/>Gb67<italic>, B. subtilis</italic> All3,<break/>
<italic>B. mojavensis</italic> Gb7</td>
<td valign="top" align="left">Induced production of PAs, VCs, EPS and ACCD</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B1">Abdelkefi et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Variovorax</italic> sp. P1R9</td>
<td valign="top" align="left">Increased SOD, CAT activity and reduced thiobarbituric acid reactive substances (TBAR<sub>S</sub>)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B2">Acuna et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Salt</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Nocardioides</italic> sp.</td>
<td valign="top" align="left">Induce expression of ACCD, <italic>TaABARE</italic>, TaHAk1, hkt1, <italic>CAT</italic>, <italic>MnSOD</italic>, <italic>POD</italic>, <italic>APX</italic>, <italic>GPX</italic>, and <italic>GR</italic> gene transcripts</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B85">Meena et&#xa0;al., 2023</xref>
</td>
</tr>
</tbody>
</table>
</table-wrap>
<table-wrap id="T2" position="float">
<label>Table&#xa0;2</label>
<caption>
<p>PR-mediated biotic stress reduction in crop plants and their tolerance mechanism.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="top" align="left">Stress condition</th>
<th valign="top" align="left">Crop</th>
<th valign="top" align="left">PR strains</th>
<th valign="top" align="left">PRs-mediated possible tolerance mechanism</th>
<th valign="top" align="left">Source</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Net blotch fungus<break/>(<italic>Drechslera teres</italic>)</td>
<td valign="top" align="left">Barley</td>
<td valign="top" align="left">
<italic>Paraburkholderia phytofirmans</italic> B25</td>
<td valign="top" align="left">Upregulation of genes related to cell wall synthesis (<italic>GSL1,GSL3</italic>, and downregulation of genes related to defense (<italic>CAT2, AOC, PRB</italic>), phenylpropanoid pathway (<italic>PAL2</italic>, <italic>F3&#x2019;H</italic>), isovitexin, and lipid compounds</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B12">Backes et&#xa0;al., 2021</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Wilt disease<break/>(<italic>Fusarium oxysporum)</italic>
</td>
<td valign="top" align="left">Faba bean</td>
<td valign="top" align="left">
<italic>Bacillus velezensis</italic>,<break/>
<italic>B. paramycoides</italic>,<break/>
<italic>paramycoides</italic>
</td>
<td valign="top" align="left">Induced production of hydrogen cyanide (HCN), siderophores (SPD), indole-3-acetic acid (IAA), abscisic acid (ABA), benzyl, kinten, ziaten, and gibberellic acid (GA<sub>3</sub>)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B35">El-Sersawy et&#xa0;al., 2021</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Wilt disease<break/>(<italic>Fusarium oxysporum</italic>)</td>
<td valign="top" align="left">Maize</td>
<td valign="top" align="left">
<italic>Pseudomonas pseudoalcaligenes</italic>
<break/>(EU921258), <italic>Bacillus pumilus</italic> (EU921259)</td>
<td valign="top" align="left">Induce expression of &#x3b2;-1,3 glucanase genes, improved photosynthetic pigment, and cell membrane stability</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B63">Jha and Mohamed, 2023a</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Wilt disease<break/>(<italic>Fusarium oxysporum f.</italic> sp.<break/>
<italic>pisi</italic>
</td>
<td valign="top" align="left">Pea</td>
<td valign="top" align="left">
<italic>Bacillus subtilis</italic> (IS1)<italic>, B. amyloliquificiens</italic> (IS6), <italic>B. fortis</italic> (IS7)</td>
<td valign="top" align="left">Upregulation of total phenolic compounds and enzymes of phenylpropanoid pathway</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B105">Raza et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Sheath blight disease<break/>(<italic>Rhizoctonia solani</italic>)</td>
<td valign="top" align="left">Rice</td>
<td valign="top" align="left">
<italic>Bacillus velezensis</italic>,<break/>
<italic>B. megaterium, B. toyonensis</italic>
</td>
<td valign="top" align="left">Increased activity of polyphenol oxidase (PPO), superoxide dismutase (SOD), catalase(CAT)</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B102">Patil et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Leaf stripe disease<break/>(<italic>Burkholderia</italic>)</td>
<td valign="top" align="left">Sorghum</td>
<td valign="top" align="left">
<italic>A. chroococcum</italic>
<break/>Beijerinck 1901 (MCC 2351),<break/>
<italic>B. megaterium</italic>
<break/>(MCC 2336),<break/>
<italic>P. fluorescens</italic> (NAIMCC B-00,340)</td>
<td valign="top" align="left">Decreased levels of malondialdehyde<break/>(MDA), proline, CAT, SOD</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B107">Rizvi et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Speck disease<break/>(<italic>Pseudomonas syringae</italic> pv. tomato)</td>
<td valign="top" align="left">Tomato</td>
<td valign="top" align="left">
<italic>Pseudomonas koreensis</italic> 5<italic>, Bacillus mycoides</italic> 68<italic>, B. mojavensis</italic> 36<italic>,B. simplex</italic> 47</td>
<td valign="top" align="left">High levels of proline, POD, CAT</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B139">Yildiz et&#xa0;al., 2023</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Wilt disease<break/>(<italic>Ralstonia solanacearum</italic>)</td>
<td valign="top" align="left">Tomato</td>
<td valign="top" align="left">
<italic>Pseudomonas</italic>
<break/>
<italic>fluorescens</italic> Pf3,<break/>
<italic>Trichoderma</italic>
<break/>
<italic>longibrachiatum</italic>
<break/>UNS11</td>
<td valign="top" align="left">Increased activity of peroxidase (POX), phenylalanine ammonia-lyase (PAL), and PPO enzymes</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B75">Konappa et&#xa0;al., 2020</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Spot blotch disease<break/>(<italic>Bipolaris sorokiniana</italic>)</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Bacillus subtilis</italic>
<break/>BS87</td>
<td valign="top" align="left">Increased levels of nutrient solubilization, SPD, IAA, HCN and decrease levels of SOD, POD, PPO, MDA, PAL, proline</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B22">Chandra et&#xa0;al., 2024</xref>
</td>
</tr>
<tr>
<td valign="top" align="left">Fungal pathogens<break/>(<italic>Alternaria alternata</italic>, <italic>Rhizoctonia solani</italic>, <italic>F. oxysporum</italic>, <italic>Ustilaginoidea virens</italic>)</td>
<td valign="top" align="left">Wheat</td>
<td valign="top" align="left">
<italic>Beijerinckia fluminensis</italic> BFC-33</td>
<td valign="top" align="left">Increased levels of carotenoid, PAL, PPO, &#x3b2;-1,3 glucanase and reduce proline, thiobarbituric acid reactive substances (TBAR<sub>S</sub>) and electrolyte leakage</td>
<td valign="top" align="left">
<xref ref-type="bibr" rid="B5">Al-Shwaiman et&#xa0;al., 2022</xref>
</td>
</tr>
</tbody>
</table>
</table-wrap>
<p>Eco-physiological and omic responses of plant rhizobacteria required more attention and extensive field research demonstrations to increase stress resistance efficiency. Hence, the present article focused on the interactions between plants and rhizobacteria and their impact on tolerance to adverse agroclimatic variables for agricultural sustainability in an eco-friendly environment.</p>
</sec>
<sec id="s2">
<title>Impact of plant development, biomass, and productivity</title>
<p>Plant rhizobacteria (PRs) effectively improve plant morphological structures during adverse environmental conditions. Abiotic stresses, such as acidic and alkaline soil, insufficient water supply, low and high temperature, UV-radiation, soil flooding, and contaminated/toxic soil, affect agronomic, anatomical, cellular, and metabolic activities (<xref ref-type="bibr" rid="B49">Glick et&#xa0;al., 2007</xref>; <xref ref-type="bibr" rid="B133">Verma et&#xa0;al., 2020a</xref>, <xref ref-type="bibr" rid="B131">b</xref>). Higher levels of phytohormones, defense-related proteins and enzymes, antioxidants, and epoxypolysaccharides cause PGPR-induced resistance (<xref ref-type="bibr" rid="B69">Kaushal and Wani, 2016</xref>). It is accomplished by changing transcriptional and signaling processes, which lead to altered gene expression when PRs are present. Because PRs produce phytohormones that change root shape and improve root development, surface area, uptake, and accumulation of nutrients, plant productivity increases in the presence of PRs (<xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>). They can also increase total plant productivity by helping to induce ACC-deaminase activity in plants. The potential of PRs enhancing plant growth and development varies due to differences in their properties, such as ACC-deaminase activity, IAA generation, root colonization, P-solubilization, etc (<xref ref-type="bibr" rid="B48">Ghosh et&#xa0;al., 2018</xref>; <xref ref-type="bibr" rid="B55">Gupta and Pandey, 2019</xref>). The defense mechanisms of plants against unfavorable agroclimatic conditions depend on the variation in the development of roots (<xref ref-type="bibr" rid="B72">Khoshru et&#xa0;al., 2023</xref>). Different PGPR strains can enhance the overall root system by increasing the total number of root tips, surface area, and structure of the roots under stressful conditions (<xref ref-type="bibr" rid="B20">Brambilla et&#xa0;al., 2022</xref>). Lowering the ethylene content increases the plant&#x2019;s capacity to withstand stress by facilitating improved nutrition and water uptake capacity (<xref ref-type="bibr" rid="B24">Chieb and Gachomo, 2023</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>).</p>
<p>When under stress, PRs also improve the uptake of water and nutrients. The absorption of nutrients and antioxidant activities are associated with stress management. By diminishing the negative consequences of saline soil, inoculation with <italic>Klebsiella oxytoca</italic> (Rs-5) containing ACC-deaminase boosted plant establishment and increased the absorption of key mineral nutrients (<xref ref-type="bibr" rid="B140">Yue et&#xa0;al., 2007</xref>; <xref ref-type="bibr" rid="B141">Zahir et&#xa0;al., 2012</xref>). In a similar way, <italic>Pseudomonas</italic> spp. inoculation increased the antioxidative enzymatic activities and promoted the growth of plants during unfavorable climatic conditions (<xref ref-type="bibr" rid="B45">Fu et&#xa0;al., 2010</xref>; <xref ref-type="bibr" rid="B62">Jalmi and Sinha, 2022</xref>) (<xref ref-type="table" rid="T1">
<bold>Table&#xa0;1</bold>
</xref>).</p>
<p>According to <xref ref-type="bibr" rid="B142">Zahir et&#xa0;al. (2009)</xref> and <xref ref-type="bibr" rid="B100">Orozco-Mosqueda et&#xa0;al. (2020)</xref>, rhizobacterial strains have been explored to have a substantial influence on the improvement of a variety of plants, including cereals, legumes, and vegetables cultivated under challenging conditions. They also enhanced the production of exopolysaccharides and ACC-deaminase activity. PRs enhance plant growth in polluted soil by downregulating the level of ethylene (<xref ref-type="bibr" rid="B28">Dell&#x2019;Amico et&#xa0;al., 2008</xref>). PRs with 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity may promote plant development during stress. Compared to uninoculated plants, the inoculated plants with PRs containing ACC-deaminase activity improved plant growth and yield considerably. <italic>Pseudomonas</italic> sp. and <italic>Acinetobacter</italic> sp. have increased IAA and ACC-deaminase production in saline soil and enhanced stress tolerance efficiency in barley and oats (<xref ref-type="bibr" rid="B68">Kang et&#xa0;al., 2019</xref>).</p>
<p>It can be indicated by the significantly increased levels of chlorophyll, total phenolics, flavonoids, soluble sugars, protein contents, and antioxidative enzymatic activities, as well as the higher expression of stress-related genes, that resulted from inoculating Cd-stressed with <italic>Serratia marcescens</italic> BM1 in <italic>Glycine max</italic> L. plants. <italic>Phaseolus vulgaris</italic> subjected to the rhizobacterial consortia experienced reduced stress caused by salinity and improved overall plant growth and photosynthetic pigments (<xref ref-type="bibr" rid="B55">Gupta and Pandey, 2019</xref>). In tomato plants, <italic>Streptomyces</italic> sp. has been shown to reduce stress and promote growth (<xref ref-type="bibr" rid="B101">Palaniyandi et&#xa0;al., 2014</xref>). It has been observed that <italic>Burkholderia phytofirmans</italic> helps plants under drought stress (<xref ref-type="bibr" rid="B96">Naveed et&#xa0;al., 2014</xref>). They generate exopolysaccharides (EPS) during water-deficit conditions, enhancing seed germination and growth. Of all the strains, <italic>Pseudomonas fluorescens</italic> has the highest capacity to produce EPS and ACC deaminase. The saline rice field was employed by <xref ref-type="bibr" rid="B123">Sultana et&#xa0;al. (2020)</xref> to isolate rhizobacterial strains, which they found to enhance stomatal conductance, transpiration, and photosynthetic CO<sub>2</sub> assimilation rate, all of which contributed to increased crop yield, fruit and grains quality. According to the latest research, <italic>Azospirillum brasilense</italic> Sp245 increased <italic>Arabidopsis thaliana</italic> growth, suggesting that MAMPs produced from plant-rhizobacteria are essential for plant cultivation (<xref ref-type="bibr" rid="B88">M&#xe9;ndez-G&#xf3;mez et&#xa0;al., 2021</xref>) (<xref ref-type="table" rid="T1">
<bold>Tables&#xa0;1</bold>
</xref>, <xref ref-type="table" rid="T2">
<bold>2</bold>
</xref>).</p>
</sec>
<sec id="s3">
<title>Photosynthetic leaf gas exchange and chlorophyll fluorescence efficiency</title>
<p>Plant-rhizobacteria enhance inoculated plants&#x2019; photosynthetic response and leaf gas exchange capability during stress (<xref ref-type="bibr" rid="B131">Verma et&#xa0;al., 2020b</xref>; <xref ref-type="bibr" rid="B62">Jalmi and Sinha, 2022</xref>). By modifying the photosynthetic characteristics, osmolytes production, antioxidant machinery, and expression of stress-related genes, inoculating soybean plants with <italic>Serratia marcescens</italic> BM1 (PR) provides Cd tolerance to plants (<xref ref-type="bibr" rid="B34">El-Esawi et&#xa0;al., 2020</xref>). Under salt stress, <italic>Bacillus amyloliquefaciens</italic> SQR9 has demonstrated higher efficiency in photosynthesis and overexpression of the RBCS and RBCL genes in <italic>Zea mays</italic> plants (<xref ref-type="bibr" rid="B23">Chen et&#xa0;al., 2016</xref>). During bacterial strain inoculation, <italic>Arabidopsis helleri</italic> showed elevated photosynthesis and proteins associated with abiotic stress (<xref ref-type="bibr" rid="B70">Khan et&#xa0;al., 2021</xref>).</p>
<p>Enhanced photosynthetic pigments and the expression of important genes (<italic>RBCS</italic> and <italic>RBCL</italic>) regulating RUBISCO activities during stress condition (<xref ref-type="bibr" rid="B119">Sherin et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B7">Amaral et&#xa0;al., 2023</xref>). By modulating ion homeostasis, redox potential, photosynthetic CO<sub>2</sub> assimilation rate, and the expression of stress-related genes, maize plants inoculated with <italic>Serratia liquefaciens</italic> KM4 revealed enhanced growth and stress tolerance (<xref ref-type="bibr" rid="B33">El-Esawi et&#xa0;al., 2018</xref>). Reduced phenol, flavonoid, and leaf relative water content and photosynthetic responses in maize plants have resulted from salinity stress, which also decreased root damage and water uptake. However, inoculating maize under salt stress with <italic>Serratia liquefaciens</italic> KM4 enhanced LRWC, photosynthetic characteristics, and the biosynthesis pathways of phenols and flavonoids, enhancing plant stress tolerance efficiency. In comparison to uninoculated plants, rhizobacteria-inoculated maize and white clover have demonstrated enhanced photosynthesis, soluble proteins, sugars, and enzymatic activities following inoculation with HAS31 rhizobacteria (<xref ref-type="bibr" rid="B58">Han et&#xa0;al., 2014</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>; <xref ref-type="table" rid="T1">
<bold>Table&#xa0;1</bold>
</xref>).</p>
</sec>
<sec id="s4">
<title>Uptake and accumulation of mineral nutrients and water balance</title>
<p>By altering the solubility and absorption of nutrients, PRs improve the bioavailability of nutrients in plants under abiotic factors. Through N<sub>2</sub>-fixation, mobilization, and the promotion of N<sub>2</sub>-fixers through their secretions, several rhizobacteria can reduce the volume of nitrogen (N<sub>2</sub>) supplementation required for plant growth (<xref ref-type="bibr" rid="B115">Shah et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B73">Khoso et&#xa0;al., 2024</xref>). Additionally, they change the shape and surface area of the roots, improving nitrogen bioavailability (<xref ref-type="bibr" rid="B99">Olenska et&#xa0;al., 2020</xref>). Elevating ammonium transporters&#x2019; expression improves nutritional absorption during stresses (<xref ref-type="bibr" rid="B21">Calvo et&#xa0;al., 2019</xref>). According to <xref ref-type="bibr" rid="B50">Gomez-God&#xed;nez et&#xa0;al. (2023)</xref>, phosphorus (P) solubilizing PRs, such as <italic>Azotobacter, Bacillus, Burkholderia, Erwinia, Pseudomonas, Serratia</italic>, and <italic>Rhizobium</italic>, generate organic acids that chelate P-bound cations and make it available to plant roots. Furthermore, under Fe-deficient conditions, PRs assist in acquiring iron (Fe) by generating siderophores, which are low molecular weight organic molecules (<xref ref-type="bibr" rid="B91">Mohanty et&#xa0;al., 2021</xref>). Reducing metal ion availability and decreasing metal uptake, siderophores that generate PRs enhance plants&#x2019; survival under heavy metal stress (<xref ref-type="bibr" rid="B29">Dimkpa et&#xa0;al., 2009</xref>; <xref ref-type="bibr" rid="B77">Kumar et&#xa0;al., 2021</xref>) (<xref ref-type="table" rid="T1">
<bold>Tables&#xa0;1</bold>
</xref>, <xref ref-type="table" rid="T2">
<bold>2</bold>
</xref>).</p>
<p>
<italic>Ocimum basilicum</italic> L. has demonstrated the ability of PRs to enhance nutrient absorption and downregulate abiotic stresses (<xref ref-type="bibr" rid="B104">Rakshapal et&#xa0;al., 2013</xref>). Under salinity stress, PRs, such as <italic>Pseudomonas</italic> sp. and <italic>Azospirillum</italic> sp., increase nutrient availability, improving plant growth, biomass, and productivity (<xref ref-type="bibr" rid="B98">Noorieh et&#xa0;al., 2013</xref>). The application of rhizobial inoculants has been observed to trigger delayed senescence, as evidenced by higher potassium (K) ion levels and lower ethylene and cytokinin production. In plants with a higher K<sup>+</sup>/Na<sup>+</sup> ratio, PRs boost the absorption of K<sup>+</sup> ions by synthesizing <italic>AtHKT1</italic>, a high-affinity ion channel that promotes stress tolerance (<xref ref-type="bibr" rid="B84">Mahmud et&#xa0;al., 2021</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>).</p>
</sec>
<sec id="s5">
<title>Biosynthesis of plant hormones and compatible solutes</title>
<p>Along with metabolites and signaling molecules, the majority of rhizobacteria produce phytohormones (<xref ref-type="bibr" rid="B3">Ahmad et&#xa0;al., 2022</xref>; <xref ref-type="bibr" rid="B115">Shah et&#xa0;al., 2022</xref>). Among these include gibberellic acid, cytokinins, indole acetic acid (IAA), and abscisic acid (ABA) (<xref ref-type="bibr" rid="B126">Tariq et&#xa0;al., 2023</xref>). IAA is produced by 80% of soil microorganisms, including <italic>Pseudomonas</italic> sp., <italic>Bacillus</italic> sp., <italic>Burkholderia</italic> sp., and <italic>Rhizobium</italic> sp (<xref ref-type="bibr" rid="B70">Khan et&#xa0;al., 2021</xref>). It has been shown that IAA-producing rhizobacteria stimulate crop production and plant growth when exposed to abiotic stress (<xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>). Numerous IAA-producing rhizobacteria increase root biomass, length, and surface area, which improves nutrient accumulation, uptake, and plant growth (<xref ref-type="bibr" rid="B41">Fasusi et&#xa0;al., 2023</xref>). Increased IAA levels also foster lateral roots&#x2019; growth, minerals&#x2019; absorption, and root exudates&#x2019; formation. It is well known that some PRs, including <italic>Arthrobacter, Azotobacter, Bacillus, Pseudomonas</italic>, and <italic>Pantoea</italic>, synthesize cytokinins that enhance nutrient availability as well as plant tolerance responses (<xref ref-type="bibr" rid="B115">Shah et&#xa0;al., 2022</xref>) (<xref ref-type="table" rid="T1">
<bold>Table&#xa0;1</bold>
</xref>).</p>
<p>According to <xref ref-type="bibr" rid="B30">dos Santos et&#xa0;al. (2020)</xref>, gibberellin-releasing PRs such as <italic>Azospirillum, Shingomonas, Bacillus amyloliquafaciens</italic>, and <italic>Bacillus pumilus</italic> can also promote plant growth and yield. Regulation of abscisic acid also played a significant role in stress resistance capacity influenced by rhizobacteria (<xref ref-type="bibr" rid="B59">Herrera-Medina et&#xa0;al., 2007</xref>). When pepper (<italic>Capsicum annum</italic>) is inoculated with <italic>Serratia nematodiphila</italic> (that produces gibberellin), the plant expands more under low-temperature stress, releases more GA<sub>4</sub> and ABA, and lower salicylate and jasmonate activities (<xref ref-type="bibr" rid="B67">Kang et&#xa0;al., 2015</xref>).</p>
<p>The plant and bacterial species may impact the mechanism of ABA-mediated tolerance to stressful conditions. Under abiotic stress, specific PRs (strains of <italic>Rhizobium</italic> spp., <italic>B. pumilus, B. lycheniformis, Achromobacter xylosoxidans</italic>, and <italic>Azospirillium brasiliense</italic>) serve as ABA-stimulators or ABA-producers (<xref ref-type="bibr" rid="B111">Salomon et&#xa0;al., 2014</xref>; <xref ref-type="bibr" rid="B31">Egamberdieva et&#xa0;al., 2017</xref>). It can assist plants minimize water loss by activating Ca<sup>+2</sup> channels that cause stomatal closure (<xref ref-type="bibr" rid="B51">Goswami and Deka, 2020</xref>; <xref ref-type="bibr" rid="B53">Grover et&#xa0;al., 2021</xref>). Greater ABA biosynthesis has been observed in <italic>Arabidopsis</italic> plants inoculated with the spermidine-producing <italic>B. megaterium</italic> strain (<xref ref-type="bibr" rid="B146">Zhou et&#xa0;al., 2016</xref>). By upregulating the gene expression that regulates ABA production, the rhizobacteria inoculation of rice with <italic>Pseudomonas fluorescens</italic> enhanced the plant&#x2019;s resistance to stress. The upregulation of <italic>TaWRKY</italic> and <italic>TaMYB</italic> expression in ABA-signaling cascades has also been observed. It has also been suggested that specific rhizobacteria can use ABA as a carbon and energy source, limiting ABA uptake throughout the plant organs. These results indicated the changes in ABA-mediated signaling pathways as a means by which inoculated plants can survive abiotic challenges (<xref ref-type="bibr" rid="B99">Olenska et&#xa0;al., 2020</xref>; <xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>).</p>
<p>It has also been demonstrated that using rhizobacteria minimizes the negative effects of ethylene generated under abiotic stress circumstances (<xref ref-type="bibr" rid="B52">Grichko and Glick, 2001</xref>; <xref ref-type="bibr" rid="B94">Nadeem et&#xa0;al., 2007</xref>; <xref ref-type="bibr" rid="B143">Zahir et&#xa0;al., 2008</xref>). Under abiotic stresses, rhizobacteria-inoculated plants have been demonstrated to modify ethylene biosynthesis-related gene expression (<xref ref-type="bibr" rid="B79">Lephatsi et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B136">Verma et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B39">Fadiji et&#xa0;al., 2022</xref>). Plants can be spared the toxicity of ethylene through the presence of rhizobacteria that contain ACC deaminase, which can hydrolyze ACC, the precursor of ET (<xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>).</p>
<p>The impact of <italic>Paenibacillus lentimorbus</italic> B-30488 inoculation on the reduction of abiotic stress in <italic>Arabidopsis thaliana</italic>, as well as by modifications in plant hormones and RSA-related gene expression. According to <xref ref-type="bibr" rid="B72">Khoshru et&#xa0;al. (2023)</xref>, specific PRs also generate polyamines, which enhance root architecture and promote stomatal conductance and photosynthesis. The microbial community in the rhizosphere is mainly influenced by the exudates produced by plant roots, such as organic acids, mucilage, carbohydrates, sugars, and proteins, which also confer tolerance to inoculated rhizobacterial plants (<xref ref-type="bibr" rid="B11">Backer et&#xa0;al., 2018</xref>). Under abiotic stress, <italic>Azospirillum</italic> sp. has been demonstrated to accumulate appropriate solutes such as glutamate, proline, glycine, betaine, and trehalose (<xref ref-type="bibr" rid="B110">Saleena et&#xa0;al., 2002</xref>). <italic>Phaenibacillus polymyxa</italic> has been shown to possess the drought-responsive gene ERD15 (<xref ref-type="bibr" rid="B127">Timmusk and Wagner, 1999</xref>). Conjugated phytohormones and flavonoids in root tissue can be extracted or hydrolyzed by <italic>Azospirillum</italic>, releasing them in their active forms (<xref ref-type="bibr" rid="B122">Spaepen et&#xa0;al., 2007</xref>; <xref ref-type="bibr" rid="B26">Dardanelli et&#xa0;al., 2008</xref>; <xref ref-type="bibr" rid="B108">Saikia et&#xa0;al., 2010</xref>; <xref ref-type="bibr" rid="B40">Fahad et&#xa0;al., 2015</xref>).</p>
<p>The mechanisms of photosynthetic activity, hydraulic conductance, osmotic accumulation, and sequestering toxic ions are associated with rhizobacteria-stimulated resilience to stress (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>). Groundnut inoculated with <italic>Bradyrhizobium</italic> under drought conditions demonstrated stress resistance due to amino acids produced from the nitrogenase to catalyzed the conversion of atmospheric nitrogen (N<sub>2</sub>) to ammonia (NH<sub>3</sub>) ions (<xref ref-type="bibr" rid="B27">Delfini et&#xa0;al., 2010</xref>; <xref ref-type="bibr" rid="B36">Enebe and Babalola, 2018</xref>). Furthermore, nitrogenase assists the supply of nitrogen to inoculated legumes, and these plants have been shown to produce more leaves due to more root nodules (<xref ref-type="bibr" rid="B44">Ferreira et&#xa0;al., 2011</xref>). To avoid desiccation, lower toxicity, and promote root growth, PRs also generate polysaccharides (<xref ref-type="bibr" rid="B9">Arora et&#xa0;al., 2010</xref>). A vital aspect of stress mitigation under environmental stress at the plant rhizosphere consists of forming biofilm and exopolysaccharide. One fascinating strategy PRs employ to mitigate the impacts of heat stress in plants involves the induction of osmoprotectants and heat shock proteins (HSPs) (<xref ref-type="bibr" rid="B36">Enebe and Babalola, 2018</xref>). Under stressful conditions, pepper plants treated with gibberellin-producing rhizobacteria showed a reduction in the level of salicylate and jasmonate. When the bacteria <italic>Burkholderia phytofirmans</italic> occurs, tomato plants produce more phenolics, proline, and starch under stress (<xref ref-type="bibr" rid="B61">Issa et&#xa0;al., 2018</xref>).</p>
<p>In plants under abiotic stress, PRs also improve proline synthesis. <italic>Arthrobacter, Bacillus</italic>, and <italic>Burkholderia</italic> are the main rhizobacteria that synthesize proline. Better stress tolerance in rhizobacteria-inoculated plants is mostly due to increased dissolved sugar levels and solute storage. Other potential strategies to reduce oxidative stress include stabilizing membranes, protein&#x2013;protein complexes, and osmolytes, such as proline, glycine betaine, amino acids, and total sugars (<xref ref-type="bibr" rid="B24">Chieb and Gachomo, 2023</xref>).</p>
</sec>
<sec id="s6">
<title>Influence of enzymatic, non-enzymatic, and lignin biosynthesis</title>
<p>The synthesis of the enzyme ACC deaminase is a well-known mechanism for rhizobacteria-led abiotic stress tolerance (<xref ref-type="bibr" rid="B37">Etesami et&#xa0;al., 2015</xref>; <xref ref-type="bibr" rid="B55">Gupta and Pandey, 2019</xref>). By lowering ABA levels, plants inoculated with ACC-producing PRs expand more rapidly; the growth hormones regulate the synthesis of secondary metabolites (<xref ref-type="bibr" rid="B68">Kang et&#xa0;al., 2019</xref>). By promoting the activity of antioxidant enzymes (SOD, APX, and CAT) and upregulating the genes involved in the ROS pathway, it enhanced stress tolerance (<xref ref-type="bibr" rid="B56">Habib et&#xa0;al., 2016</xref>). Because ethylene causes stress-induced H<sub>2</sub>O<sub>2</sub> accumulation and apoptosis induction, ACC deaminase-producing PRs provide plants resistance against abiotic stress by lowering ethylene synthesis. It has been observed that inoculating different crops under stress with strains that include ACC-deaminase enhances plant development (<xref ref-type="bibr" rid="B80">Li et&#xa0;al., 2017</xref>; <xref ref-type="bibr" rid="B120">Singh and Jha, 2017</xref>; <xref ref-type="bibr" rid="B95">Namwongsa et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B25">Danish et&#xa0;al., 2020</xref>; <xref ref-type="bibr" rid="B86">Mellidou et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>).</p>
<p>Plant-to-microbe communication also occurs by an array of non-hormonal signaling molecules. Microbes produce volatile compounds (VOCs), signaling molecules that control plant growth and modify soil and plant health in response to stress (<xref ref-type="bibr" rid="B130">Ullah et&#xa0;al., 2021</xref>). Moreover, plants tolerate heavy metal stress due to rhizobacteria-releasing extracellular polymeric substances (EPS), which primarily help by lowering the metals&#x2019; bioavailability in the soil (<xref ref-type="bibr" rid="B89">Mishra et&#xa0;al., 2017</xref>). Some species of <italic>Bacillus, Azotobacter, Burkholderia, Enterobacter</italic>, and <italic>Pseudomonas</italic> can reprogram plants&#x2019; redox states, increasing their tolerance to environmental stresses. During stress, the overproduction of reactive oxygen species (ROS) changes redox states and causes DNA damage, proteins, and membrane fluidity, ultimately resulting in cell death. However, plants inoculated with PRs defended against abiotic stressors by activating their defense mechanisms. Antioxidant enzyme activity enhanced in an array of growth-promoting rhizobacterial species to assist them in combatting oxidative stress (<xref ref-type="bibr" rid="B90">Mitra et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>; <xref ref-type="table" rid="T1">
<bold>Tables&#xa0;1</bold>
</xref>, <xref ref-type="table" rid="T2">
<bold>2</bold>
</xref>).</p>
<p>Additionally, rhizobacteria are essential in reducing oxidative damage caused by various stressors, including heavy metals, water deficit, low and high temperatures, salt, and water scarcity. By lowering ROS levels in plant roots, rhizobacteria-induced antioxidant enzymes assist in reducing the stressors that plants experience in the environment. Additionally, they accelerate the growth rate in response to abiotic stressors by promoting the generation of antioxidant enzymes. Better stress tolerance in inoculated plants may be due to increased activities of antioxidant enzymes, such as catalase (CAT), ascorbate peroxidase (APX), or glutathione peroxidase (GPX) (<xref ref-type="bibr" rid="B86">Mellidou et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B124">Swain et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B39">Fadiji et&#xa0;al., 2022</xref>). Ascorbate peroxidase increased when tomato seedlings were inoculated with <italic>Enterobacter</italic> and subjected to abiotic stress. Gladiolus plants treated with rhizobacteria revealed increased levels of CAT and SOD activities as compared to their control group (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>).</p>
<p>Tomato seedlings inoculated with <italic>P. oryzihabitans</italic> AXSa06 (having ACC deaminase) experienced mild oxidative stress and enhanced lipid peroxidation to trigger the antioxidant machinery (<xref ref-type="bibr" rid="B86">Mellidou et&#xa0;al., 2021</xref>). Under abiotic stress, tomato plants inoculated with a strain of <italic>Sphingomonas</italic> sp. revealed reduced lipid peroxidation, increased glutathione levels, and antioxidant enzyme activities (<xref ref-type="bibr" rid="B57">Halo et&#xa0;al., 2015</xref>; <xref ref-type="bibr" rid="B87">Mellidou and Karamanoli, 2022</xref>). In contrast, rhizobacteria inoculation has been demonstrated in additional studies to decrease the production of ROS-scavenging or stress-responsive enzymes that are important for plant protection in stressful environments (<xref ref-type="bibr" rid="B55">Gupta and Pandey, 2019</xref>; <xref ref-type="bibr" rid="B51">Goswami and Deka, 2020</xref>; <xref ref-type="bibr" rid="B121">Song et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B137">Verma et&#xa0;al., 2022a</xref>, <xref ref-type="bibr" rid="B132">b</xref>, <xref ref-type="bibr" rid="B134">c</xref>). The generation of defensive enzymes like chitinase and glucanase to the rhizobacteria stress-tolerance mechanism (<xref ref-type="bibr" rid="B47">Garc&#xed;a-Fraile et&#xa0;al., 2015</xref>). <italic>Glycine max</italic> plants inoculated with <italic>Bacillus firmus</italic> SW5 exhibit stress tolerance through alterations in root ultrastructure, antioxidant levels, and stress-related gene expression (<xref ref-type="bibr" rid="B34">El-Esawi et&#xa0;al., 2020</xref>). The production of oxalic acid, gluconic acid, and citric acid by stressed rhizobacteria plays a crucial role in the mobilization of heavy metals. Biofilm-forming rhizobacteria were inoculated into <italic>Spartina densiflora</italic> plants, resulting in increased levels of SOD, CAT, and APOX activities as well as a decrease in the induced oxidative stress index (OSI) (<xref ref-type="bibr" rid="B103">Perez et&#xa0;al., 2019</xref>; <xref ref-type="bibr" rid="B70">Khan et&#xa0;al., 2021</xref>; <xref ref-type="bibr" rid="B18">Bhat et&#xa0;al., 2022</xref>).</p>
<p>In <italic>Cicer arietinum</italic> plants, <italic>Pseudomonas putida</italic> MTCC5279 has been shown to reduce stress by enhanced ROS scavenging ability, modulation of membrane integrity, and accumulation of osmolyte (proline, glycine, betaine). These findings have also been validated by differential expression of genes involved in dehydration-responsive element binding, transcription factors expressed under abiotic stress, salicylic acid, jasmonate, transcription activation, SOD, CAT, APX, and GST (<xref ref-type="bibr" rid="B128">Tiwari et&#xa0;al., 2016</xref>; <xref ref-type="bibr" rid="B24">Chieb and Gachomo, 2023</xref>). In <italic>Abelmoschus esculentus</italic> plants, the presence of ACC-producing PRs was associated with increased activities of antioxidant enzymes (SOD, APX, and CAT) and up-regulated genes of the ROS pathways (CAT, APX, GR, and DHAR) (<xref ref-type="bibr" rid="B56">Habib et&#xa0;al., 2016</xref>). These pathways have also been linked to enhanced POD/CAT activity, decreased cell death, and increased glutathione levels for ROS scavenging. When <italic>Dietzia natronolimnaea</italic> was inoculated into wheat (<italic>Triticum aestivum</italic>), it was observed that the ABA-signaling cascade genes, ion transporters, salt overly sensitive (SOS) pathway, and antioxidant enzymes upregulated (<xref ref-type="bibr" rid="B17">Bharti et&#xa0;al., 2016</xref>) (<xref ref-type="fig" rid="f1">
<bold>Figure&#xa0;1</bold>
</xref>).</p>
</sec>
<sec id="s7" sec-type="conclusions">
<title>Conclusion and future prospects</title>
<p>Adverse environmental variables severely affect crop growth, development, and output and downregulate the overall socio-economic growth of sustainable agriculture. Different application strategies have been developed to challenge stress, its benefits, and its applications. Nowadays, the requirement for higher food grain productivity and safety, enhanced plant yield, fertility of soil properties, and agricultural sustainability are upregulating. The research demonstrations are shifting toward soil rhizospheric-bio-based engineering to facilitate a better pollution-free environment for combining plants and rhizobacteria. The application of PRs is more beneficial in overcoming stressed conditions besides providing other significant direct and indirect ways to upregulate overall plant responses. PRs are more convenient, economical, and eco-enviro-friendly and can be applied in small cultivating areas to large fields. Variations in the modifications of plant responses under stress have been observed in inoculated plants, and these variations are dependent on the PRs mode of action, which represents the multifactorial processes regulated in stressful environments. The positive symbiotic associanship that plants develop with microbial physiology is fundamental for the plant development, especially in terms of biotic and abiotic stresses. It is necessary to set up deeply extensive field research demonstrations to understand better the interaction between the PRs-mediated signal and the metabolic/molecular reprogramming that improves plant tolerance to unfavorable environmental variables. Multi-strain bacterial strains can be substantial if a single strain of bacteria is not more significant in reducing stress resistance efficiency. The application, duration, and applicability of inoculation are more crucial as unmanaged methods may lead to consistent and correct results. Its successful agro-commercialization will based on the involvement of plant physiologists, plant biologists, plant pathologists, biotechnologists, agro-industrialists, and farmers. A better and deep understanding of the action mechanisms and interactions of plants and associated plant rhizobacteria directly in the matrix of interest can be favored by the adoption of a holistic approach that uses &#x201c;omic&#x201d; applications.</p>
</sec>
<sec id="s8" sec-type="author-contributions">
<title>Author contributions</title>
<p>KV: Conceptualization, Data curation, Formal analysis, Methodology, Resources, Software, Validation, Writing &#x2013; original draft. AJ: Conceptualization, Data curation, Formal analysis, Software, Writing &#x2013; original draft. X-PS: Conceptualization, Data curation, Funding acquisition, Investigation, Project administration, Software, Supervision, Validation, Visualization, Writing &#x2013; review &amp; editing. QL: Data curation, Formal analysis, Funding acquisition, Resources, Software, Writing &#x2013; review &amp; editing. LX: Data curation, Formal analysis, Resources, Software, Writing &#x2013; review &amp; editing. H-rH: Data curation, Formal analysis, Resources, Software, Writing &#x2013; review &amp; editing. K-CW: Data curation, Funding acquisition, Resources, Software, Supervision, Writing &#x2013; review &amp; editing. CS: Data curation, Formal analysis, Resources, Software, Writing &#x2013; review &amp; editing. JA: Data curation, Formal analysis, Resources, Software, Writing &#x2013; review &amp; editing. Y-RL: Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing &#x2013; review &amp; editing.</p>
</sec>
</body>
<back>
<sec id="s9" sec-type="funding-information">
<title>Funding</title>
<p>The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This research was financially supported by the Guangxi Key R &amp; D Program (Guike AB24010140), Guangxi Natural Science Foundation (2021GXNSFAA220022; 2023GXNSFAA026459; 2023GXNSFAA026460), Guangxi Innovation Teams of Modern Agriculture Technology (nycytxgxcxtd-2021&#x2013;03), Guangxi Characteristic Crop Experimental Station (GTS2022022), National Key Research and Development Project (2022YFD2301102&#x2013;07), The National Natural Science Foundation of China (31760415; 32060468), Fund of Guangxi Academy of Agricultural Sciences (2021YT011), Science and Technology Major Project of Guangxi (Guike AA22117002&#x2013;1), Fundamental Research Fund of Guangxi Academy of Agriculture Sciences (2023YM55) and Key Research and Development Program of Nanning (20232060).</p>
</sec>
<ack>
<title>Acknowledgments</title>
<p>The authors would like to thank the Guangxi Academy of Agricultural Sciences, Nanning, Guangxi, China, for providing the necessary facilities for this study.</p>
</ack>
<sec id="s10" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec id="s11" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors&#xa0;and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
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