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A Putative Plasma Membrane Cation/proton Antiporter from Soybean Confers Salt Tolerance in <Emphasis Type="Italic">Arabidopsis</Emphasis>
Authors:Guang-Zuo?Luo  Hui-Wen?Wang  Jian?Huang  Ai-Guo?Tian  Yong-Jun?Wang  Jin-Song?Zhang  Email author" target="_blank">Shou-Yi?ChenEmail author
Institution:(1) National Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 100101 Beijing, China
Abstract:Cation transport is thought to be an important process for ion homeostasis in plant cells. Here, we report that a soybean putative cation/proton antiporter GmCAX1 may be a mediator of this process. GmCAX1 is expressed in all tissues of the soybean plants but at a lower level in roots. Its expression was induced by PEG, ABA, Ca2+, Na+ and Li+ treatments. The GmCAX1-GFP fusion protein was mainly localized in plasma membrane of the transgenic Arabidopsis plant cells and onion epidermal cells. Transgenic Arabidopsis plants overexpressing GmCAX1 accumulated less Na+, K+, and Li+, and were more tolerant to elevated Li+ and Na+ levels during germination when compared with the controls. These results suggest that GmCAX1 may function as an antiporter for Na+, K+ and Li+. Modulation of this antiporter may be beneficial for regulation of ion homeostasis and thus plant salt tolerance.
Keywords:antiporter  stress tolerance  soybean
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