The Sweetpotato Voltage-Gated K+ Channel beta Subunit, KIbB1, Positively Regulates Low-K+ and High-Salinity Tolerance by Maintaining Ion Homeostasis

文献类型： 外文期刊

第一作者： Zhu, Hong

作者： Zhu, Hong;Yang, Xue;Li, Qiyan;Guo, Jiayu;Ma, Tao;Liu, Shuyan;Lin, Shunyu;Zhao, Chunmei;Wang, Jingshan;Sui, Jiongming;Yang, Xue;Zhou, Yuanyuan

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关键词： sweetpotato; voltage-gated K+ channel beta subunit; KIbB1; low K+; high salinity; ion homeostasis

期刊名称：GENES （ 影响因子：4.141； 五年影响因子：4.474 ）

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年卷期： 2022 年 13 卷 6 期

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收录情况： SCI

摘要： Voltage-gated K+ channel beta subunits act as a structural component of K-in channels in different species. The beta subunits are not essential to the channel activity but confer different properties through binding the T1 domain or the C-terminal of alpha subunits. Here, we studied the physiological function of a novel gene, KIbB1, encoding a voltage-gated K+ channel beta subunit in sweetpotato. The transcriptional level of this gene was significantly higher in the low-K+-tolerant line than that in the low-K+-sensitive line under K+ deficiency conditions. In Arabidopsis, KIbB1 positively regulated low-K+ tolerance through regulating K+ uptake and translocation. Under high-salinity stress, the growth conditions of transgenic lines were obviously better than wild typr (WT). Enzymatic and nonenzymatic reactive oxygen species (ROS) scavenging were activated in transgenic plants. Accordingly, the malondialdehyde (MDA) content and the accumulation of ROS such as H2O2 and O2- were lower in transgenic lines under salt stress. It was also found that the overexpression of KIbB1 enhanced K+ uptake, but the translocation from root to shoot was not affected under salt stress. This demonstrates that KIbB1 acted as a positive regulator in high-salinity stress resistance through regulating Na+ and K+ uptake to maintain K+/Na+ homeostasis. These results collectively suggest that the mechanisms of KIbB1 in regulating K+ were somewhat different between low-K+ and high-salinity conditions.

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