Plant Molecular Biology

, Volume 59, Issue 5, pp 809–820

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
Article

DOI: 10.1007/s11103-005-1386-0

Cite this article as:
Luo, GZ., Wang, HW., Huang, J. et al. Plant Mol Biol (2005) 59: 809. doi:10.1007/s11103-005-1386-0

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

antiporterstress tolerancesoybean

Copyright information

© Springer 2005

Authors and Affiliations

  • Guang-Zuo Luo
    • 1
  • Hui-Wen Wang
    • 1
  • Jian Huang
    • 1
  • Ai-Guo Tian
    • 1
  • Yong-Jun Wang
    • 1
  • Jin-Song Zhang
    • 1
  • Shou-Yi Chen
    • 1
  1. 1.National Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of SciencesBeijingChina