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Genome-wide association study reveals a genomic region on 5AL for salinity tolerance in wheat
journal contributionposted on 2023-05-21, 13:21 authored by Quamruzzaman, MD, S M Nuruzzaman ManikS M Nuruzzaman Manik, Sergey ShabalaSergey Shabala, Cao, F, Meixue ZhouMeixue Zhou
Soil salinity is a major threat to crop productivity and quality worldwide. In order to reduce the negative effects of salinity stress, it is important to understand the genetic basis of salinity tolerance. Identifying new salinity tolerance QTL or genes is crucial for breeders to pyramid different tolerance mechanisms to improve crop adaptability to salinity. Being one of the major cereal crops, wheat is known as a salt-sensitive glycophyte and subject to substantial yield losses when grown in the presence of salt. In this study, both pot and tank experiments were conducted to investigate the genotypic variation present in 328 wheat varieties in their salinity tolerance at the vegetative stage. A Genome-Wide Association Studies (GWAS) were carried out to identify QTL conferring salinity tolerance through a mixed linear model. Six, five and eight significant marker-trait associations (MTAs) were identified from pot experiments, tank experiments and average damage scores, respectively. These markers are located on the wheat chromosomes 1B, 2B, 2D, 3A, 4B, and 5A. These tolerance alleles were additive in their effects and, when combined, increased tolerance to salinity. Candidate genes identified in these QTL regions encoded a diverse class of proteins involved in salinity tolerance in plants. A Na+/H+ exchanger and a potassium transporter on chromosome 5A (IWB30519) will be of a potential value for improvement of salt tolerance of wheat cultivars using marker assisted selection programs. Some useful genotypes, which showed consistent tolerance in different trials, can also be effectively used in breeding programs.
Grains Research & Development Corporation
Publication titleTheoretical and Applied Genetics
Department/SchoolTasmanian Institute of Agriculture (TIA)
Place of publication175 Fifth Ave, New York, USA, Ny, 10010
Rights statement© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021.