A putative plasma membrane cation/proton antiporter from soybean confers salt tolerance in Arabidopsis

Guang Zuo Luo, Hui Wen Wang, Jian Huang, Ai Guo Tian, Yong Jun Wang, Jin Song Zhang, Shou Yi Chen

Research output: Contribution to journalArticle

61 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)809-820
Number of pages12
JournalPlant Molecular Biology
Issue number5
StatePublished - Nov 1 2005



  • Antiporter
  • Soybean
  • Stress tolerance

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

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