[Objective]The aims of the present study were to identify and evaluate the grain quality traits of forage barley germplasm resources,and to provide references for the subsequent resource utilization.[Method]A total of 100 barley germplasm resources were chosen and the contents of moisture,protein,starch,fat,cellulose,ash and β-glucan of their grains were determined.The genetic diversities of the 7 quality traits were assessed using descriptive statistics,correlation analysis,cluster analysis and principal component analysis methods.[Result]The coefficients of variation for the 7 quality traits ranged from 2.92%to 13.93%,and the highest and the lowest were observed in cellulose content and starch content.Correlation analysis indicated that barley grain protein content had extremely significantly(P＜0.01)negative correlation with β-glucan content,cellulose content had extremely significantly(P＜0.01)negative correlation with starch content and β-glucan content,and starch content had extremely significantly(P＜0.01)positive correlation with β-glucan content.Cluster analysis divided the germplasm population into 3 categories.CategoryⅠwas composed of 30 materials which were characterized by high coefficients of variation in contents of cellulose,fat and ash.CategoryⅡwas composed of 69 materials which were characterized by the lowest average contents of protein,cellulose and fat as well as the highest average contents of starch,ash and β-glucan.CategoryⅢhad one material which was characterized by the highest protein content and the lowest contents of starch,ash and β-glucan.Principal component analysis demonstrated that the cumulative contribution rate of the first two principal components reached up to 76.47%.[Conclusion]The 7 grain quality traits of the tested forage barley germplasm resources were rich in genetic diversity.One germplasm,GNM,characterized by higher protein content and lower β-glucan content was obtained.
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