数字农科院2.0

Loss Of Salt Tolerance During Tomato Domestication Conferred By Variation In A Na+/K+ Transporter

文献类型： 外文期刊

作者： Wang, Z; Hong, YC; Zhu, GT; Li, YM; Niu, QF; Yao, JJ; Hua, K; Bai, JJ; Zhu, YF; Shi, HZ; Huang, SW; Zhu, JK

作者机构：

关键词： Domestication; Na+-K+ Transporter; Salt Tolerance; Slhak20; Tomato

期刊名称： EMBO JOURNAL

ISSN： 0261-4189

年卷期： 2020 年 39 卷 10 期

页码：

收录情况： JCR（2021版）

摘要： Domestication has resulted in reduced salt tolerance in tomato. To identify the genetic components causing this deficiency, we performed a genome-wide association study (GWAS) for root Na+/K+ ratio in a population consisting of 369 tomato accessions with large natural variations. The most significant variations associated with root Na+/K+ ratio were identified within the gene SlHAK20 encoding a member of the clade IV HAK/KUP/KT transporters. We further found that SlHAK20 transports Na+ and K+ and regulates Na+ and K+ homeostasis under salt stress conditions. A variation in the coding sequence of SlHAK20 was found to be the causative variant associated with Na+/K+ ratio and confer salt tolerance in tomato. Knockout mutations in tomato SlHAK20 and the rice homologous genes resulted in hypersensitivity to salt stress. Together, our study uncovered a previously unknown molecular mechanism of salt tolerance responsible for the deficiency in salt tolerance in cultivated tomato varieties. Our findings provide critical information for molecular breeding to improve salt tolerance in tomato and other crops.

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