title: The plasma membrane Na+/H+ antiporter SOS1 interacts with RCD1 and functions in oxidative stress tolerance in Arabidopsis.
abstract: The adverse effects of high salt on plants include Na(+) toxicity and hyperosmotic and oxidative stresses. The plasma membrane-localized Na(+)/H(+) antiporter SOS1 functions in the extrusion of toxic Na(+) from cells and is essential for plant salt tolerance. We report here that, under salt or oxidative stress, SOS1 interacts through its predicted cytoplasmic tail with RCD1, a regulator of oxidative-stress responses. Without stress treatment, RCD1 is localized in the nucleus. Under high salt or oxidative stress, RCD1 is found not only in the nucleus but also in the cytoplasm. Like rcd1 mutants, sos1 mutant plants show an altered sensitivity to oxidative stresses. The rcd1mutation causes a decrease in salt tolerance and enhances the salt-stress sensitivity of sos1 mutant plants. Several genes related to oxidative-stress tolerance were found to be regulated by both RCD1 and SOS1. These results reveal a previously uncharacterized function of a plasma membrane Na(+)/H(+) antiporter in oxidative-stress tolerance and shed light on the cross-talk between the ion-homeostasis and oxidative-stress detoxification pathways involved in plant salt tolerance.
authors.affiliation: Institute for Integrative Genome Biology and Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
authors.forename: Surekha
authors.initials: S
authors.lastname: Katiyar-Agarwal
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhu
authors.forename: Kangmin
authors.initials: K
authors.lastname: Kim
authors.forename: Manu
authors.initials: M
authors.lastname: Agarwal
authors.forename: Xinmiao
authors.initials: X
authors.lastname: Fu
authors.forename: Alex
authors.initials: A
authors.lastname: Huang
authors.forename: Jian-Kang
authors.initials: JK
authors.lastname: Zhu
mesh_terms: D017360:Arabidopsis / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000502:physiology*; D009687:Nuclear Proteins / Q000502:physiology*; D018384:Oxidative Stress / Q000502:physiology*; D017923:Sodium-Hydrogen Exchangers / Q000502:physiology*
chemical_list: D029681:Arabidopsis Proteins; D009687:Nuclear Proteins; C492758:RCD1 protein, Arabidopsis; C477653:SOS1 protein, Arabidopsis; D017923:Sodium-Hydrogen Exchangers