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Article: Low-Affinity Na^sup +^ Uptake in the Halophyte Suaeda maritima1[C][W][OA]
- Article from:
- Plant Physiology
- Article date:
- October 1, 2007
- Author:
CopyrightCopyright American Society of Plant Biologists Oct 2007. Provided by ProQuest LLC. (Hide copyright information)
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Na^sup +^ uptake by plant roots has largely been explored using species that accumulate little Na^sup +^ into their shoots. By way of contrast, Nathe halophyte Suaeda maritima accumulates, without injury, concentrations of the order of 400 mM NaCl in its leaves. Here we report that cAMP and Ca^su
p 2+^ (blockers of nonselective cation channels) and Li1 (a competitive inhibitor of Na^sup +^ uptake) did not have any significant effect on the uptake of Na^sup +^ by the halophyte S. maritima when plants were in 25 or 150 mM NaCl (150 m M NaCl is near optimal for growth). However, the inhibitors of K^sup +^ channels, TEA^sup +^ (10 mM ), Cs^sup +^ (3 mM ), and Ba^sup 2+^ (5 m M ), significantly ...