Interactive effects of potassium and sodium on root growth and expression of K/Na transporter genes in rice |
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Authors: | Yanshou Wu Yibing Hu Guohua Xu |
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Institution: | (1) State Key Laboratory of Crop Genetics & Germplasm Enhancement, College of Resource & Environmental Sciences, Nanjing Agriculture University, 210095 Jiangsu, China;(2) Key Laboratory of Marine Biology in Jiangsu Province, College of Resource & Environmental Sciences, Nanjing Agriculture University, 210095 Jiangsu, China |
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Abstract: | Sufficient supply of potassium (K) can alleviate the adverse effects of excess sodium (Na) on plant growth. However, it remains
unclear if such a beneficial function is related to regulation of root growth and/or expression of K/Na transporters. Herein
we report the responses of a rice cultivar, which was pretreated with normal nutrient solution for 1 month, to three levels
of Na (0, 25, and 100 mM) without or with supply of K for 9 days. High Na (100 mM) significantly decreased plant growth, root
activity, and total K uptake, and increased biomass ratio of roots to shoots. Short-term removal of K supply (9 days) did
not affect root morphology and biomass ratio of roots to shoots, but decreased root activity of seedlings grown in high Na
solution. K deficiency increased uptake of Na and transport of K from roots to shoots. Moreover, expression of OsHAK1, a putative K transporter gene, was upregulated by low Na (25 mM) and downregulated by high Na (100 mM) in roots. In leaves,
its expression was suppressed by the Na treatments when K supply was maintained. Expression of OsHKT2;1, which encodes a protein that acts mainly as a Na transporter, was downregulated by high Na, but was enhanced by K deficiency
both in roots and leaves. Expression of five other putative K/Na transporter or Na+/H+ genes, OsHKT1;1, OsHKT1;2, OsHKT2;3, OsNHX1, and OsSOS1, was not affected by the treatments. The results suggest that OsHAK1 and OsHKT2;1 were involved in the interactive effects of K and Na on their uptake and distribution in rice.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Oryza sativa Sodium Potassium OsHAK1 OsHKT2 1 |
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