Cluster Analysis of Fruit Quality Evaluation Indices of Nanfeng Tangerine

The main fruit quality indices such as simple fruit weight,fruit shape index,juice percentage,soluble sugar,tritrable,vitamin C and soluble solids content in Nanfeng tangerine cv 'Yangxiao-26' coming from twenty different cultivating regions were studied by using multivariate statistics.The selection types of fruit quality factors were confirmed by means of principal component analysis and systematic cluster analysis.The results revealed that the cumulative proportion of the former 6 principal components reached 95.20% through principal component analysis with 9 main quality indices.By using systematic cluster analysis with eigenvectors of the former 6 principal components,five evaluation factors were selected to simplify evaluation course,and these five selected factors were:(1) fruit shape index or juice percentage;(2) melting grade or segment number;(3) titratable acid content;(4) vitamin C content;(5) simple fruit weight or soluble sugar or soluble solids contents.The cluster analysis of fruit quality in Nanfeng tangerine was carried out by selecting simplification indices of fruit shape index,melting grade,titratable acid content,vitamin C content and soluble solids contents.