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We have investigated whether the overexpression of RCI2A gene causes an enhanced salt‐tolerant phenotype in Arabidopsis thaliana. Although the growth of RCI2A‐overexpressing transgenic plants was comparable with that of wild type under normal conditions, high salinity treatment caused decreased accumulation of Na+ and ameliorated suppression of the shoot growth of transgenic plants than that of wild type. Under high salinity treatment, the chlorophyll content of the shoots of wild‐type plants significantly decreased compared with transgenic plants. The increases of malondialdehyde (MDA) and of H2O2 production caused by high salinity were greater in the shoots of wild type than in that of transgenic plants. These results suggest that overexpression of RCI2A can alleviate salinity‐induced growth suppression and photooxidative damages via reducing Na+ uptake into the shoots.
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Mitsuya et al. (2006) studied this question.
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