The Sweet Potato K+ Transporter IbHAK11 Regulates K+ Deficiency and High Salinity Stress Tolerance by Maintaining Positive Ion Homeostasis

文献类型： 外文期刊

第一作者： Zhu, Hong

作者： Zhu, Hong;Guo, Jiayu;Ma, Tao;Liu, Shuyan;Yang, Xue;Li, Qiyan;Yu, Kaiyue;Wang, Tongshuai;He, Sixiang;Zhao, Chunmei;Wang, Jingshan;Sui, Jiongming;Zhu, Hong;Zhou, Yuanyuan;Sui, Jiongming

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关键词： sweet potato; K+ transporter; IbHAK11; K+ deficiency tolerance; high salinity tolerance; K+; Na+ homeostasis

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

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年卷期： 2023 年 12 卷 13 期

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收录情况： SCI

摘要： The K+ transporter KT/HAK/KUP (K+ transporter/high-affinity K+/K+ uptake) family has a critical effect on K+ uptake and translocation in plants under different environmental conditions. However, the functional analysis of KT/HAK/KUP members in sweet potatoes is still limited. The present work reported the physiological activity of a new gene, IbHAK11, in the KT/HAK/KUP family in sweet potatoes. IbHAK11 expression increased significantly in the low K+-tolerant line compared with the low K+-sensitive line following treatment with low K+ concentrations. IbHAK11 upregulation promoted root growth in Arabidopsis under low K+ conditions. Under high saline stress, transgenic lines had superior growth and photosynthetic characteristics compared with the wild-type (WT). As for IbHAK11-overexpressing plants, activation of both the non-enzymatic and enzymatic reactive oxygen species (ROS) scavenging systems was observed. Therefore, IbHAK11-overexpressing plants had lower malondialdehyde (MDA) and ROS levels (including H2O2 and O2-) compared with WT under salt-induced stress. We also found that under both low K+ and high salinity conditions, overexpression of IbHAK11 enhanced K+ translocation from the root to the shoot and decreased Na+ absorption in Arabidopsis. Consequently, IbHAK11 positively regulated K+ deficiency and high salinity stresses by regulating K+ translocation and Na+ uptake, thus maintaining K+/Na+ homeostasis in plants.

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