Corrigendum: Populus trichocarpa PtNF-YA9, a Multifunctional Transcription Factor, Regulates Seed Germination, Abiotic Stress, Plant Growth and Development in Arabidopsis - Lian, Conglong; Li, Qing; Yao, Kun; Zhang, Ying; Meng, Sen; Yin, Weilun; Xia, Xinli (Frontiers in Plant Science, 2018)