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. 2011 Dec 4;44(1):32-9.
doi: 10.1038/ng.1018.

Genome-wide Association Study of Flowering Time and Grain Yield Traits in a Worldwide Collection of Rice Germplasm

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Genome-wide Association Study of Flowering Time and Grain Yield Traits in a Worldwide Collection of Rice Germplasm

Xuehui Huang et al. Nat Genet. .

Abstract

A high-density haplotype map recently enabled a genome-wide association study (GWAS) in a population of indica subspecies of Chinese rice landraces. Here we extend this methodology to a larger and more diverse sample of 950 worldwide rice varieties, including the Oryza sativa indica and Oryza sativa japonica subspecies, to perform an additional GWAS. We identified a total of 32 new loci associated with flowering time and with ten grain-related traits, indicating that the larger sample increased the power to detect trait-associated variants using GWAS. To characterize various alleles and complex genetic variation, we developed an analytical framework for haplotype-based de novo assembly of the low-coverage sequencing data in rice. We identified candidate genes for 18 associated loci through detailed annotation. This study shows that the integrated approach of sequence-based GWAS and functional genome annotation has the potential to match complex traits to their causal polymorphisms in rice.

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