Association Mapping of Kernel Size and Milling Quality in Wheat (Triticum aestivum L.) Cultivars

Genetics - Tập 172 Số 2 - Trang 1165-1177 - 2006
F. Breseghello1,2, Mark E. Sorrells1
1Department of Plant Breeding and Genetics, Cornell University, Ithaca, New York 14853 and
2Embrapa Rice and Beans, Santo Antônio de Goiás, Goiás 75375, Brazil

Tóm tắt

Abstract Association mapping is a method for detection of gene effects based on linkage disequilibrium (LD) that complements QTL analysis in the development of tools for molecular plant breeding. In this study, association mapping was performed on a selected sample of 95 cultivars of soft winter wheat. Population structure was estimated on the basis of 36 unlinked simple-sequence repeat (SSR) markers. The extent of LD was estimated on chromosomes 2D and part of 5A, relative to the LD observed among unlinked markers. Consistent LD on chromosome 2D was <1 cM, whereas in the centromeric region of 5A, LD extended for ∼5 cM. Association of 62 SSR loci on chromosomes 2D, 5A, and 5B with kernel morphology and milling quality was analyzed through a mixed-effects model, where subpopulation was considered as a random factor and the marker tested was considered as a fixed factor. Permutations were used to adjust the threshold of significance for multiple testing within chromosomes. In agreement with previous QTL analysis, significant markers for kernel size were detected on the three chromosomes tested, and alleles potentially useful for selection were identified. Our results demonstrated that association mapping could complement and enhance previous QTL information for marker-assisted selection.

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Thông tin xuất bản

Genetics

Tập 172 Số 2

1165-1177

Thông tin tác giả