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, Ca(2+), 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.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Antiporters / chemistry
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Antiporters / genetics*
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Antiporters / metabolism*
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Arabidopsis / cytology
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Arabidopsis / drug effects*
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Arabidopsis / genetics
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Arabidopsis / metabolism
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Calcium-Binding Proteins / chemistry
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Calcium-Binding Proteins / genetics*
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Calcium-Binding Proteins / metabolism*
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Cation Transport Proteins / chemistry
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Cation Transport Proteins / genetics*
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Cation Transport Proteins / metabolism*
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Cell Membrane / metabolism*
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Gene Expression Regulation, Plant
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Glycine max / genetics*
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Lithium / metabolism
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Lithium / pharmacology*
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Molecular Sequence Data
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Plant Proteins / genetics
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Plant Proteins / metabolism
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Plants, Genetically Modified
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Sequence Alignment
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Sequence Homology, Amino Acid
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Sodium Chloride / metabolism
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Sodium Chloride / pharmacology*
Substances
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Antiporters
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Calcium-Binding Proteins
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Cation Transport Proteins
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Plant Proteins
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calcium-hydrogen antiporters
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Sodium Chloride
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Lithium