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Awn is one of the most important domesticated traits in rice(Oryza sativa).Understanding the genetic basis of awn length is important for grain harvest and production because long awn length is disadvantageous for both grain harvest and milling.We investigated the awn length of 529 rice cultivarsand performed a genome-wide association studies(GWAS)in the indicaandjaponica subpopulation,and the whole population.In total,we found 17 loci associated with awn length.Of these loci,seven were linked to previously reported quantitative trait loci(QTL),and one was linked to the awn geneAn-1.Nine novel loci were repeatedly identified in different environments.One of the nine associations was identified in both the whole and japonica populations.Of special interest was the detection ofthemostsignificant association SNP,sf0136352825,which was less than 95 kb fromthe seed shattering geneqSH1.These results may provide potentially favorable haplotypes for molecular breeding in rice.