Genome-Wide Association Study Reveals Marker-Trait Associations for Early Vegetative Stage Salinity Tolerance in Rice

Overview

Journal Plants (Basel)

Date 2021 Apr 3

PMID 33809618

Citations 10

Authors

Ashutosh Kumar Yadav

Aruna Kumar

Nitasha Grover

Ranjith Kumar Ellur

Haritha Bollinedi

Subbaiyan Gopala Krishnan

Prolay Kumar Bhowmick

Kunnummal Kurungara Vinod

Mariappan Nagarajan

Ashok Kumar Singh

Affiliations

Soon will be listed here.

Abstract

Rice germplasm is a rich resource for discovering genes associated with salt tolerance. In the current study, a set of 96 accessions were evaluated for seedling stage salinity tolerance and its component traits. Significant phenotypic variation was observed among the genotypes for all the measured traits and eleven accessions with high level of salt tolerance at seedling stage were identified. The germplasm set comprised of three sub-populations and genome-wide association study (GWAS) identified a total of 23 marker-trait associations (MTAs) for traits studied. These MTAs were located on rice chromosomes 1, 2, 5, 6, 7, 9, and 12 and explained the trait phenotypic variances ranging from 13.98 to 29.88 %. Twenty-one MTAs identified in this study were located either in or near the previously reported quantitative trait loci (QTLs), while two MTAs namely, qSDW2.1 and qSNC5 were novel. A total of 18 and 13 putative annotated candidate genes were identified in a genomic region spanning ~200 kb around the MTAs and respectively. Some of the important genes underlying the novel MTAs were , and which are known to be associated with salinity tolerance in crops. These MTAs pave way for combining salinity tolerance with high yield in rice genotypes through molecular breeding.

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