A Putative Plasma Membrane Cation/proton Antiporter from Soybean Confers Salt Tolerance in Arabidopsis

A Putative Plasma Membrane Cation/proton Antiporter from Soybean Confers Salt Tolerance in... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

A Putative Plasma Membrane Cation/proton Antiporter from Soybean Confers Salt Tolerance in Arabidopsis

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Kluwer Academic Publishers
Copyright © 2005 by Springer
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
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