Loss of salt tolerance during tomato domestication conferred by variation in a Na+ /K+ transporter.

The EMBO Journal
Zhen WangJian-Kang Zhu

Abstract

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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Citations

Apr 15, 2020·The EMBO Journal·Yanli Xiang, José M Jiménez-Gómez
Nov 19, 2020·International Journal of Molecular Sciences·Seher YolcuByeong-Ha Lee
Dec 29, 2020·Journal of Plant Physiology·Federico ScossaAlisdair R Fernie
Feb 13, 2021·Plant Phenomics : a Science Partner Journal·Jacinto GandulloChrista Testerink
Jul 10, 2021·Frontiers in Plant Science·Alexander M C BowlesUlrike Bechtold
Jun 12, 2021·Journal of Experimental Botany·Ali RazzaqSergey Shabala

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