Abstract
Improvement of end-use quality in bread wheat (Triticum aestivum L.) depends on a thorough understanding of the genetic basis of important quality traits. The main goal of our study was to investigate the genetic basis of 1,000-kernel weight, protein content, sedimentation volume, test weight, and starch concentration using an association mapping approach. We fingerprinted 207 diverse European elite soft winter wheat lines with 115 SSR markers and evaluated the genotypes in multi-environment trials. The principal coordinate analysis revealed absence of a clear population but presence of a family structure. Therefore, we used linear mixed models and marker-based kinship matrices to correct for family structure. In genome-wide scans, we detected main effect QTL for all five traits. In contrast, epistatic QTL were only observed for sedimentation volume and test weight explaining a small proportion of the genotypic variation. Consequently, our findings suggested that integrating epistasis in marker-assisted breeding will not lead to substantially increased selection gain for quality traits in soft winter wheat.
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Acknowledgments
This research was conducted within the Biometric and Bioinformatic Tools for Genomics based Plant Breeding project supported by the German Federal Ministry of Education and Research (BMBF) within the framework of GABI–FUTURE initiative.
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Communicated by X. Xia.
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Supplementary Fig. S1.
Histogram of the proportion of marker loci with shared variants (Sij) among the 207 soft winter wheat lines. Moreover, optimum values for the average probability that two alleles are alike in state, given that they are not identical by descent are indicated by arrows for 1000-kernel weight (TA), protein content (TB), sedimentation volume (TC), test weight (TD), and starch concentration (TE) (EPS 670 kb)
Supplementary Fig. S2.
Associations among the average probability that two alleles are alike in state, given that they are not identical by descent (T values) and the fit of the mixed model based on the phenotypic data for A protein content (%), B sedimentation volume (ml), C test weight (kg hL−1), and D starch concentration (%). Associations among T values and the number of (1) significant (P < 0.01) main effect QTL and (2) significant (P < 0.05 applying a Bonferroni-Holm correction for multiple tests) epistatic QTL detected in the genome-wide scan (EPS 1710 kb)
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Reif, J.C., Gowda, M., Maurer, H.P. et al. Association mapping for quality traits in soft winter wheat. Theor Appl Genet 122, 961–970 (2011). https://doi.org/10.1007/s00122-010-1502-7
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DOI: https://doi.org/10.1007/s00122-010-1502-7