Abstract
The yellow pigment content (YPC) of endosperm affects the quality and nutritional value of wheat grain products. Major quantitative trait loci (QTL) for endosperm YPC have been repeatedly mapped on chromosomes 7A and 7B in durum and bread wheats. The genes coding for phytoene synthase (PSY1), which is involved in the biosynthesis of carotenoids, generally co-segregate with these QTL, indicating their role in determining YPC. Here, to study the genetic factors underlying endosperm YPC in bread wheat, the sequence polymorphism of the homoeologous A, B and D copies of genes coding for PSY1, Psy-A1, Psy-B1, and Psy-D1, was studied in a worldwide core collection, which was also phenotyped for flour YPC. Seven novel alleles of Psy-A1 and two novel alleles of Psy-B1 were detected, which confirms the high level of polymorphism of these genes. Two major QTL with respective candidate genes Psy-A1 and Psy-B1 were identified in the distal region of chromosomes 7A and 7B using progeny of a cross between Apache and Ornicar, high and low YPC cultivars, respectively. Association mapping confirms the role of these genes in YPC and shows that the D copy also significantly influences this trait. These results indicate that breeders need to consider all three Psy1 copies when seeking to improve the YPC of wheat endosperm.
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Acknowledgments
The authors thank Rachel Carol and her team from Emendo Bioscience Ltd for English corrections. They are grateful to the staff of the Clermont-Ferrand INRA experimental unit led by B. Debote for field trials. Only sequences of novel alleles were deposited in Genbank. When sequences were 100 % identical for several lines, only one was deposited.
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Ravel, C., Dardevet, M., Leenhardt, F. et al. Improving the yellow pigment content of bread wheat flour by selecting the three homoeologous copies of Psy1 . Mol Breeding 31, 87–99 (2013). https://doi.org/10.1007/s11032-012-9772-1
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DOI: https://doi.org/10.1007/s11032-012-9772-1