Corrigendum: Polyamine regulates tolerance to water stress in leaves of white clover associated with antioxidant defense and dehydrin genes via involvement in calcium messenger system and hydrogen peroxide signaling - Li, Zhou; Zhang, Yan; Peng, Dandan; Wang, Xiaojuan; Peng, Yan; He, Xiaoshuang; Zhang, Xinquan; Ma, Xiao; Huang, Linkai; Yan, Yanhong (Frontiers in Physiology, 2016)