Comprehensive evaluation of fruit quality of 22 cold-resistant pear varieties
[Objective]In order to explore the main influencing indexes of fruit quality evaluation of cold-resistant pear,the fruit quality evaluation system of varieties was established to provide reference for the optimization and upgrading of regional pear varieties and reasonable zoning.[Method]The fruits of 22 cold-resistant pear varieties were used as test materials,and six quality indexes were determined.The comprehensive scores were calculated according to the scores of the first four principal components and the corresponding weights by difference analysis,correlation analysis,principal component analysis and cluster analysis.[Result]There were significant differences in the same quality index among the tested varieties,and the coefficient of variation was from 11%to 85%.There was no significant correlation between fruit shape index and other five quality indexes.Soluble solids content was significantly positively correlated with soluble sugar content,sugar-acid ratio and solid-acid ratio(P＜0.01).Titratable acid content was significantly negatively correlated with sugar-acid ratio and solid-acid ratio(P＜0.01).Four principal components were extracted from the transformation data analysis,and principal component 1 represented the sugar-acid ratio and solid-acid ratio.Principal component 2 represents the index of soluble solids;principal component 3 represents fruit shape index;principal component 4 represents the index of titratable acid,and the cumulative contribution rate of these four principal components reached 99.58%;factor analysis screened out'Hanluli''Hansuli''Nanguoli''Hanxiangli''Hongnanguo'five top-ranking varieties;cluster analysis divided 22 cold-resistant pear varieties into five categories at a genetic distance of 9.Group I included 10 varieties with autumn pear or autumn pear blood relationship.The four varieties of group Ⅱhad neat fruit shape and outstanding appearance quality.The five varieties of group Ⅲ and the two varieties of group Ⅳmostly had the pedigree of apple pear,but the fruit of group Ⅳ was crisper.Group Ⅴ had only one variety of'Hanluli',and its sugar-acid ratio and solid-acid ratio were significantly higher than other varieties,and the flavor was sweet.[Conclusion]Fruit shape index,soluble solids,sugar-acid ratio and solid-acid ratio can be used as the core indicators for the evaluation of cold-resistant pear fruit quality.The results of factor analysis and cluster analysis were consistent,which could be used to comprehensively evaluate the quality of cold-resistant pear fruit.
NETL
NSTL
万方数据
