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Rice shaker potassium channel OsAKT2 positively regulates salt tolerance and grain yield by mediating K+ redistribution

文献类型： 外文期刊

作者： Tian, Quanxiang 1 ; Shen, Like 1 ; Luan, Junxia 1 ; Zhou, Zhenzhen 2 ; Guo, Dongshu 2 ; Shen, Yue 1 ; Jing, Wen 1 ; Zhang, Baolong 2 ; Zhang, Qun 1 ; Zhang, Wenhua 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Life Sci, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China

2.Jiangsu Acad Agr Sci, Prov Key Lab Agrobiol, Nanjing, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Ind Crops, Nanjing, Peoples R China

关键词： ion homeostasis; phloem transport; rice; salinity; shaker K+ channel

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.228； 五年影响因子：7.791 ）

ISSN： 0140-7791

年卷期：

页码：

收录情况： SCI

摘要： Maintaining Na+/K+ homeostasis is a critical feature for plant survival under salt stress, which depends on the operation of Na+ and K+ transporters. Although some K+ transporters mediating root K+ uptake have been reported to be essential to the maintenance of Na+/K+ homeostasis, the effect of K+ long-distance translocation via phloem on plant salt tolerance remains unclear. Here, we provide physiological and genetic evidence of the involvement of phloem-localized OsAKT2 in rice salt tolerance. OsAKT2 is a K+ channel permeable to K+ but not to Na+. Under salt stress, a T-DNA knock-out mutant, osakt2 and two CRISPR lines showed a more sensitive phenotype and higher Na+ accumulation than wild type. They also contained more K+ in shoots but less K+ in roots, showing higher Na+/K+ ratios. Disruption of OsAKT2 decreases K+ concentration in phloem sap and inhibits shoot-to-root redistribution of K+. In addition, OsAKT2 also regulates the translocation of K+ and sucrose from old leaves to young leaves, and affects grain shape and yield. These results indicate that OsAKT2-mediated K+ redistribution from shoots to roots contributes to maintenance of Na+/K+ homeostasis and inhibition of root Na+ uptake, providing novel insights into the roles of K+ transporters in plant salt tolerance.

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