Potassium channel alpha-subunit AtKC1 negatively regulates AKT1-mediated K+ uptake in Arabidopsis roots under low-K+ stress

文献类型： 外文期刊

第一作者： Wang, Yi

作者： Wang, Yi;He, Liu;Li, Hao-Dong;Xu, Jiang;Wu, Wei-Hua;He, Liu;Li, Hao-Dong;Xu, Jiang

作者机构：

关键词： Arabidopsis;potassium channel;low-K+ stress;AKT1;AtKC1

期刊名称：CELL RESEARCH （ 影响因子：25.617； 五年影响因子：25.924 ）

ISSN： 1001-0602

年卷期： 2010 年 20 卷 7 期

页码：

收录情况： SCI

摘要： Potassium transporters play crucial roles in K+ uptake and translocation in plants. However, so far little is known about the regulatory mechanism of potassium transporters. Here, we show that a Shaker-like potassium channel AtKC1, encoded by the AtLKT1 gene cloned from the Arabidopsis thaliana low-K+ (LK)-tolerant mutant Atlkt1, significantly regulates AKT1-mediated K+ uptake under LK conditions. Under LK conditions, the Atkc1 mutants maintained their root growth, whereas wild-type plants stopped their root growth. Lesion of AtKC1 significantly enhanced the tolerance of the Atkc1 mutants to LK stress and markedly increased K+ uptake and K+ accumulation in the Atkc1-mutant roots under LK conditions. Electrophysiological results showed that AtKC1 inhibited the AKT1-mediated inward K+ currents and negatively shifted the voltage dependence of AKT1 channels. These results demonstrate that the 'silent' K+ channel alpha-subunit AtKC1 negatively regulates the AKT1-mediated K+ uptake in Arabidopsis roots and consequently alters the ratio of root-to-shoot under LK stress conditions.

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