A novel mitochondrial protein is required for cell wall integrity, auxin accumulation and root elongation in Arabidopsis under salt stress

Abstract Maintenance of root elongation is beneficial for the growth and survival plants under salt stress, but currently cellular components involved in regulation high salinity are not fully understood. In this study, we identified an Arabidopsis mutant, rres1 , which exhibited reduced treatment a variety salts, including NaCl, NaNO 3 KCl, KNO . RRES1 encodes novel mitochondrial protein its molecular function still unknown. Under meristem length was shorter mutant compared to wild type, correlated with auxin accumulation mutant. Reactive oxygen species (ROS), as important signals that regulate elongation, were accumulated higher levels than type after treatment. Measurement monosaccharides cell wall showed arabinose xylose contents decreased application boric acid, required crosslinking pectic polysaccharide rhamnogalacturonan-II (RG-II), largely rescued arrest suggesting participates maintenance integrity stress. GUS staining assay indicated gene expressed leaves weakly tip normal conditions, expression dramatically increased roots Together, our study reveals regulates stress via modulation integrity, accumulation, ROS homeostasis.