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Title of Journal: Mol Breeding

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Abbravation: Molecular Breeding

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Springer Netherlands

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1572-9788

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Genomewide association mapping for grain yield co

Authors: Javed Akhatar Surinder S Banga
Publish Date: 2015/01/24
Volume: 35, Issue: 1, Pages: 48-
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Abstract

We used a Diversity Fixed Foundation Set comprising 48 inbred lines of Brassica juncea and representing all the adaption zones of the crop for association mapping Extensive phenotypic variations were observed for all the grain yield components and root traits under both irrigated and restricted moisture conditions The genotypes differed in their responses to moisture stress Trait averages declined numerically under restricted moisture conditions when compared to a standard irrigation schedule Canonical analysis demonstrated the importance of primary branches and seed size as the traits of significance for drought susceptibility index Microsatellite markers 158 representing all the 18 chromosomes were used to assess the population structure linkage disequilibrium LD in the association panel and marker–trait associations MTAs A comparison of four association models general linear model/GLMQmatrix/Q mixed linear model MLMQ+kinship matrix/K GLM principal components/PC and MLMPC + K showed that GLMPC and MLMPC + K incorporating principal components and kinship matrix were the best models Maximum proportions of significant results were observed in the models GLMPC and MLMPC + K MLM was preferred as there were fewer false positives than GLM Thirteen significant associations were detected between the molecular markers and agronomic traits Of these seven were identified under normal moisture conditions and six under restricted moisture conditions Marker–trait associations included four markers associated with grain yield three with seed size two with secondary branches and one marker each with plant height root diameter and root length A single marker SB18221 was repeatedly detected for seed size and grain yield and was localized at 175 cM centiMorgans on chromosome B3 Marker SB38723 revealed a significant effect under normal moisture conditions on seed size R 2 = 1516 at 609 cM on chromosome B5 during the first year Among the favorable alleles SB18221 had the average positive phenotypic effect for seed size and grain yield Marker cnu3163 had maximum positive phenotypic effects on grain yield

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