关键词: 垂穗披碱草, 种质资源, 产量, 品质, 综合评价

Abstract:

In order to select the elite germplasm resource as the breeding materials of the cultivars with high yield and good quality in the future, the nine yield and quality characters of 45 wild Elymus nutans populations were comprehensively evaluated by principal component analysis and cluster analysis. The results indicated that each character of 45 Elymus nutans germplasm resource had significant difference. Hey yield had the highest variable coefficient (40.86%), whereas both neutral detergent fiber and acid detergent fiber had lower variable coefficients (2.43% and 5.37%). Correlation analysis indicated that there were varying degrees of connection between each character of tested materials, especially yield was significantly negative correlation with water soluble carbohydrate, and crude protein was significantly negative correlation with agronomic characters such as plant height and dry matter content, respectively. The nine characters were transformed to four principal components that basically represented the main information of the original target and the cumulative contribution rate was 85.53%. Cluster analysis showed that 45 Elymus nutans populations were divided into 8 categories. The materials would not be divided into the same group strictly according to the same provenance, however, they would be clustered into one group if they came from the similar habitat. The results of principal component analysis and cluster analysis indicated that the material of P16 had the character of high yield, the materials of P22, P23 and P42 had the character of high sugar, the material of P36 had the character of high protein, and the materials of P30, P31, P38 and P39 had better comprehensive performance.

Key words: Elymus nutans, Germplasm resource, Production, Quality, Comprehensive evaluation