Rice roots avoid asymmetric heavy metal and salinity stress via an RBOH-ROS-auxin signaling cascade
作者机构：State Key Laboratory of Crop Genetics&Germplasm Enhancement and UtilizationCollege of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China
出 版 物：《Molecular Plant》 (分子植物（英文版）)
年 卷 期：2023年第16卷第10期
页 面：1678-1694页
核心收录：
基 金：supported by the Key R&D Program of the Ministry of Science&Technology of China(2022YFD1700102) the Key Research and Development Program of Jiangsu Province(BE2021717) the Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(KYCX220756) the Fundamental Research Funds for the Central Universities(QTPY2023003 and XUEKEN2023042)
主 题：root system architecture heterogenous abiotic stress reactive oxygen species signaling
摘 要：Root developmental plasticity is crucial for plants to adapt to a changing soil environment,where nutrients and abiotic stress factors are distributed *** plant roots sense and avoid heterogeneous abiotic stress in soil remains ***,we show that,in response to asymmetric stress of heavy metals(cadmium,copper,or lead)and salt,rice roots rapidly proliferate lateral roots(LRs)in the stress-free area,thereby remodeling root architecture to avoid localized *** and quantitative analyses of reactive oxygen species(ROS)showed that asymmetric stress induces a ROS burst in the tips of the exposed roots and simultaneously triggers rapid systemic ROS signaling to the unexposed *** of a ROS scavenger to either the stressed or stress-free area abolished systemic ROS signaling and LR proliferation induced by asymmetric *** stress also enhanced cytosolic calcium(Ca^(2+))signaling;blocking Ca^(2+)signaling inhibited systemic ROS propagation and LR branching in the stress-free *** identified two plasma-membrane-localized respiratory burst oxidase homologs,OsRBOHA and OsRBOHI,as key players in systemic ROS signaling under asymmetric *** of OsRBOHA and OsRBOHI in roots was upregulated by Cd stress,and knockout of either gene reduced systemic ROS signaling and LR proliferation under asymmetric ***,we demonstrated that auxin signaling and cell wall remodeling act downstream of the systemic ROS signaling to promote LR ***,our study reveals an RBOH-ROS-auxin signaling cascade that enables rice roots to avoid localized stress of heavy metals and salt and provides new insight into root system plasticity in heterogenous soil.
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