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

Zhen Wang, Yechun Hong, Guangtao Zhu, Yumei Li, Qingfeng Niu, Juanjuan Yao, Kai Hua, Jinjuan Bai, Yingfang Zhu, Huazhong Shi, Sanwen Huang, Jian Kang Zhu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish
Article numbere103256
JournalEMBO Journal
Volume39
Issue number10
DOIs
StatePublished - May 18 2020

Keywords

  • Na-K transporter
  • SlHAK20
  • domestication
  • salt tolerance
  • tomato

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