Genome-wide association study dissects the genetic bases of salt tolerance in maize seedlings

Journal of Integrative Plant Biology
Xi LuoMingqiu Dai

Abstract

Excess salinity is a natural stress that causes crop yield losses worldwide. The genetic bases of maize salt tolerance remain largely unknown. Here we investigated the survival rates of 445 maize natural accessions after salt treatments. A skewed distribution of the salt-tolerant phenotypes was observed in this population. Genome-wide association studies (GWAS) revealed 57 loci significantly associated with salt tolerance. Forty-nine candidate genes were detected from these loci. About 10% of these genes were co-localized with loci from QTL mapping. Forty four percent of the candidate genes were involved in stress responses, ABA signaling, stomata division, DNA binding/transcription regulation and auxin signaling, suggesting that they are key genetic mechanisms of maize salt tolerance. Transgenic studies showed that two genes, the salt-tolerance-associated-gene 4 (SAG4, GRMZM2G077295) and SAG6 (GRMZM2G106056), which encode a protein transport protein and the double-strand break repair protein MRE11, respectively, had positive roles in plant salt tolerance, and their salt-tolerant haplotypes were revealed. The genes we identified in this study provide a list of candidate targets for further study of maize salt tolerance, and of ...Continue Reading

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Citations

May 18, 2019·Journal of Integrative Plant Biology·Jianbing Yan, Bao-Cai Tan
Jul 25, 2019·International Journal of Molecular Sciences·Zhenghua HeMingqiu Dai
Sep 16, 2019·Functional & Integrative Genomics·Devinder SandhuRajandeep S Sekhon
Mar 7, 2021·Genes·Ruwani DissanayakeSukhjiwan Kaur
Nov 2, 2020·Journal of Experimental Botany·Long LiRuilian Jing
May 9, 2021·Scientific Reports·Yunxiao ZhengJinjie Guo
Aug 8, 2021·International Journal of Molecular Sciences·Guoliang HanBaoshan Wang
Jul 5, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Langlang MaYaou Shen

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