ZHANG Haizhou, XIE Yiqi, WANG Yunfei, MU Xin, LIU Yiqian, CHENG Qing, SUN Liang, SHEN Huolin
In order to evaluate and analyze the nutritional quality of pepper germplasm resources,and identify the excellent germplasm. Seven fruit nutritional quality indexes including dry matter,vitamin C,capsaicinoid,capsanthin,soluble sugar,crude fiber and α-glucosidase inhibition rate were determined from 103 capsaicin germplasm resources provided by the Vegetable Department of Horticulture College of China Agricultural University.The nutritional quality of pepper germplasm resources was evaluated by correlation analysis,principal component analysis,membership function value method and systematic cluster analysis.The results showed that the coefficient of variation of 7 nutritional quality indexes was more than 20%,and the coefficient of variation of capsaicinoid content was the largest,reaching 147.53%.Through principal component analysis,three principal components were selected,and the cumulative percentage was 61.229%.Combined with the correlation among the indexes,the contents of dry matter,capsaicin and capsaicin were used as the representative indexes to evaluate the nutritional quality of capsaicin germplasm resources.The comprehensive evaluation model was used to calculate the comprehensive score of pepper germplasm resources,and 10 germplasm resources with the highest score were selected.At the same time,the average membership value of pepper germplasm resources was systematically clustered,and there were 6 pepper germplasm resources with good quality.Through cluster analysis,103 pepper germplasm resources were divided into four groups.In summary,the contents of capsaicinoid,dry matter and capsanthin can be used as representative indexes to evaluate the nutritional quality of capsicum. The pepper materials with excellent comprehensive quality include 21QS54,21QS69,21QS84 and 21QS96,which further provide a basis for the improvement of the nutritional quality of capsicum.