158份裸大麦种质资源主要性状的多样性分析与综合评价OA

To efficiently utilize naked barley germplasm resources,15 traits of 158 naked barley germplasm resources from different sources were analyzed using coefficients of variation,Shannon-Wiener genetic diversity indexes,correlation analysis,principal component analysis,and cluster analysis,and comprehensive evaluation was conducted to screen for excellent germplasm.The results showed that there was abundant variation in the 15 traits among different naked barley resources,with the coefficient of variation ranging from 7.84%to 69.65%and an average of 26.69%.Among them,the degree of dispersion of spike color was the highest,and the coefficient of variation of grain perimeter was the lowest.The diversity index ranged from 0.51 to 2.09,with an average of 1.62,among which grain width had the highest diversity index and awn type had the lowest.A regression equation was established through stepwise regression,indicating that 1000-grain weight,spike color,grain perimeter,β-glucan content,row type,grain area,and grain width can be used as comprehensive evaluation indicators for screening excellent naked barley germplasm.Principal component analysis transformed the 15 individual indicators into six independent comprehensive indicators with a cumulative contribution rate of 82.111%.Cluster analysis classified the tested materials into five groups,among which Group Ⅳ(21 materials)had the highest average D-value.The top five varieties based on D-value were Jet,Tet,22DJ2,Zangqing 3000,and 12-10-556,which can serve as excellent parents for naked barley breeding.