Based on the analysis of genomic DNA sequence and PCR,the genotypes of grain length gene qGL3 were identified in sequenced wild species of genus Oryza,294 accessions of rice mini core collection(RMCC)and 65 japonica varieties certificated in Jiangsu Province from 2007 to 2013.Homologous sequences of gene qGL3 were found in all the wild rices involved.The phylogeny based on the coding sequence of gene qGL3 demonstrated an apparent differentiation among the wild species of genus Oryza.Subsequently one conveni...