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Open AccessArticle

Genome-Wide Association Mapping for Heat Stress Responsive Traits in Field Pea

1
Department of Plant Sciences, College of Agriculture and Bio-resources, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada
2
AgriGenome Labs Pvt. Ltd., Hyderabad 500 078, India
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(6), 2043; https://doi.org/10.3390/ijms21062043
Received: 14 February 2020 / Revised: 9 March 2020 / Accepted: 14 March 2020 / Published: 17 March 2020
(This article belongs to the Special Issue Legume Genetics and Biology: From Mendel's Pea to Legume Genomics)
Environmental stress hampers pea productivity. To understand the genetic basis of heat resistance, a genome-wide association study (GWAS) was conducted on six stress responsive traits of physiological and agronomic importance in pea, with an objective to identify the genetic loci associated with these traits. One hundred and thirty-five genetically diverse pea accessions from major pea growing areas of the world were phenotyped in field trials across five environments, under generally ambient (control) and heat stress conditions. Statistical analysis of phenotype indicated significant effects of genotype (G), environment (E), and G × E interaction for all traits. A total of 16,877 known high-quality SNPs were used for association analysis to determine marker-trait associations (MTA). We identified 32 MTAs that were consistent in at least three environments for association with the traits of stress resistance: six for chlorophyll concentration measured by a soil plant analysis development meter; two each for photochemical reflectance index and canopy temperature; seven for reproductive stem length; six for internode length; and nine for pod number. Forty-eight candidate genes were identified within 15 kb distance of these markers. The identified markers and candidate genes have potential for marker-assisted selection towards the development of heat resistant pea cultivars. View Full-Text
Keywords: pea; heat stress; genetic diversity; GWAS; genotyping-by-sequencing; marker-trait association; candidate-gene pea; heat stress; genetic diversity; GWAS; genotyping-by-sequencing; marker-trait association; candidate-gene
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MDPI and ACS Style

Tafesse, E.G.; Gali, K.K.; Lachagari, V.B.R.; Bueckert, R.; Warkentin, T.D. Genome-Wide Association Mapping for Heat Stress Responsive Traits in Field Pea. Int. J. Mol. Sci. 2020, 21, 2043. https://doi.org/10.3390/ijms21062043

AMA Style

Tafesse EG, Gali KK, Lachagari VBR, Bueckert R, Warkentin TD. Genome-Wide Association Mapping for Heat Stress Responsive Traits in Field Pea. International Journal of Molecular Sciences. 2020; 21(6):2043. https://doi.org/10.3390/ijms21062043

Chicago/Turabian Style

Tafesse, Endale G.; Gali, Krishna K.; Lachagari, V.B. R.; Bueckert, Rosalind; Warkentin, Thomas D. 2020. "Genome-Wide Association Mapping for Heat Stress Responsive Traits in Field Pea" Int. J. Mol. Sci. 21, no. 6: 2043. https://doi.org/10.3390/ijms21062043

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