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
作者： Zhu, Hong 1 ; Guo, Jiayu 1 ; Ma, Tao 1 ; Liu, Shuyan 1 ; Zhou, Yuanyuan 3 ; Yang, Xue 1 ; Li, Qiyan 1 ; Yu, Kaiyue 1 ; Wang, Tongshuai 1 ; He, Sixiang 1 ; Zhao, Chunmei 1 ; Wang, Jingshan 1 ; Sui, Jiongming 1 ;
作者机构： 1.Qingdao Agr Univ, Coll Agron, Qingdao 266109, Peoples R China
2.Qingdao Agr Univ, Acad Dongying Efficient Agr Technol & Ind Saline &, Dongying 257091, Peoples R China
3.Shandong Acad Agr Sci, Crop Res Inst, Sci Observing & Expt Stn Tuber & Root Crops Huang, Minist Agr & Rural Affairs, Jinan 250100, Peoples R China
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 ）
ISSN：
年卷期： 2023 年 12 卷 13 期
页码：
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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