摘 要：探讨贵州晚熟李品质差异，为新品种选育及定向育种提供理论支撑。采

Abstract: To explore the quality differences of late-maturing plums in Guizhou, to provide theoretical support for new varieties selection and directional breeding. Collect plum fruits that mature in and after mid-August in Guizhou, and measure the fruit size, water content, energy, soluble solids, total sugar, total acid, vitamin C, and amino acids and nutrients required by the human body, using SPSS 26.0 statistical software The description method, correlation method, dimensionality reduction method and classification method in the analysis. The results show that the dispersion degree of the component content is different, and the difference is large. The main components that affect plum fruit quality are energy, soluble solids, total sugar, sugar/acid, and vitamin C. The cumulative contribution rate of the three principal component eigenvalues ​​extracted by principal component analysis is 86.537%, and the comprehensive score intuitively reflects the excellent order. The cluster analysis divides the comprehensive quality into three categories, and the cluster analysis is consistent with the comprehensive evaluation results. The higher the moisture content, the softer the pulp of plum fruit, the more sticky the core, and the shorter the fruit storage time. The selection of edible late-maturing plum breeding materials with sweet taste and high sugar content can be determined by measuring the soluble solid content of the fruit. The higher the soluble solid content is better; the top 3 late fragrant and crisp plums, and late plums Gaoping plum can be used as an excellent material for new varieties selection and directional breeding. <br>Keywords: Guizhou late-ripening plum; fruit quality; principal component analysis; cluster analysis; comprehensive evaluation

Abstract: To explore the differences in the quality of late-maturing Plum in Guizhou, and to provide theoretical support for the selection of new varieties and directed breeding. Collected in guizhou in mid-August and later mature Li fruit, to determine its fruit size, moisture content, energy, soluble solids, total sugar, total acid, vitamin C and the human body required amino acids and nutrients, using SPSS 26.0 statistical software description, related methods, dimensional reduction and classification methods for analysis. The results show that the degree of dispersion between the component content shass different lying and the difference is great. The main components that affect the quality of Li's fruit are energy, soluble solids, total sugar, sugar/acid and vitamin C. The cumulative contribution rate of the main component analysis and extraction of 3 main component feature values was 86.537 percent, and the comprehensive score visually reflected the good order. Cluster analysis divides the comprehensive quality into three categories, and the cluster analysis is consistent with the results of the comprehensive evaluation. The higher the moisture content, the softer the fruit meat, the more sticky the core, the shorter the shelf life of the fruit. Screening sweet taste, high sugar content of edible late-maturing plum breeding materials, can be determined by determining the soluble solid seoid content of fruit, with high content of soluble solids, the pre-sort 3 late-crisp, chimor Li and Gao Ping Li can be selected as a new variety of breeding and directional breeding of good materials.<br>Keywords: Guizhou late-ripe Li; Fruit quality; main ingredient analysis; cluster analysis; comprehensive evaluation.

Abstract: To explore the quality difference of late maturing plum in Guizhou, and provide theoretical support for new variety breeding and directional breeding. The size, moisture content, energy, soluble solids, total sugar, total acid, vitamin C, amino acids and nutritional elements needed by human body were measured. The data were analyzed by descriptive method, correlation method, dimension reduction method and classification method in SPSS 26.0 statistical software. The results showed that the dispersion degree of the components was different, and the difference was large. Energy, soluble solids, total sugar, sugar / acid and vitamin C were the main components affecting the quality of plum fruit. The cumulative contribution rate of the three principal component eigenvalues extracted by principal component analysis is 86.537%, and the comprehensive score directly reflects the excellent order. The results of cluster analysis are consistent with the results of comprehensive evaluation. The higher the moisture content, the softer the pulp, the more sticky the core and the shorter the storage time. In order to screen the sweet taste and high sugar content of edible late maturing plum breeding materials, we can determine the soluble solid content of the fruit, and the high soluble solid content is the best; the top three of late fragrant crisp, Qimo and Gaoping plum can be used as excellent materials for new variety breeding and directional breeding.<br>Key words: Guizhou late ripening plum; fruit quality; principal component analysis; cluster analysis; comprehensive evaluation