6Souza E,Sorrells M E.Relationships among 70 North American oat germplasms:I.Cluster analysis using quantitative characters[J].Crop Science,1991,31(3):599-605.
7Perry M C,Mcintosh M S.Geographical patterns of variation in the USDA soybean germplasm collection:I.Morphological traits[J].Crop Science,1991,31(5):1350-1355.
8Aulicino M B,Arturi M J.Phenotypic diversity in Argentinian populations of Bromus catharticus(Poaceae).Genetic and environmental components of quantitative traits[J].New Zealand Journal of Botany,2002,40(2):223-234.
