Effect of potassium on uptake and translocation of sodium and potassium in Chinese cabbage under NaCl stress |
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Authors: | Hai Yun Li |
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Affiliation: | Department of Horticulture, College of Agriculture, Liaocheng University, Liaocheng, Shandong province, PR China |
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Abstract: | To investigate the influence of potassium (K+) on the salinity tolerance of Chinese cabbage (Brassica pekinensis Rupr.) seedlings, the plants were cultured at three K+ levels (0, 5, or 10?mM), under normal (0?mM NaCl) and high-salt (100?mM NaCl) conditions. The results indicated that the dry weight of Chinese cabbage increased with the application of K+ under salt stress. Addition of K+ increased K+ concentrations and suppressed sodium (Na+) concentration, which eventually increased the K+/Na+ ratios in roots or shoots. Application of K+ enhanced the uptake of K+ and suppressed the uptake of Na+. Moreover, the ratios of shoot-K+/root-K+ increased considerably, but the ratios of shoot-Na+/root-Na+ decreased in response to K+ application. It was concluded that the application of K+ could enhance the salt stress tolerance in Chinese cabbage because more K+ than Na+ was absorbed and translocated from roots to shoots. |
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Keywords: | Brassica pekinensis Rupr. K+/Na+ ratio potassium salinity uptake and translocation |
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