Factor analysis and evaluation index selection of fruit quality of 11 apple varieties
With the fruits of 11 apple varieties introduced from Yili River Valley as test materials by coefficient of variation,correlation analysis,factor analysis and cluster analysis to study the evaluation and classification of apple appearance and internal quality traits,in order to provide a basis for the rapid establishment of fruit quality evaluation index system of different apple varieties.The results showed that there were significant differences in the coefficient of variation of each quality index,among which the difference of vitamin C was the largest,with a coefficient of variation of 72.45％.The difference of total sugar content,Fe content,fruit vertical diameter and fruit transverse diameter was small,with a coefficient of variation of less than 10％.Factor analysis extracted five main factors of fruit quality,flavor,mineral nutrition and acidity,and the cumulative variance contribution rate was 92.81％.The main factor load value was analyzed by principal component analysis,and the simplified evaluation indexes of fruit quality were single fruit quality,soluble solids content,Ca content,hardness and total acid content.The simplified fruit quality evaluation indexes were selected for cluster analysis.When the square Euclidean distance was 11,the 11 apple varieties could be classified into 4 categories;the first category had better sweet and sour taste with higher soluble solids content;the second one had better Ca content with high hardness;the third one contained higher total sugar content and better flavor;the fourth one had larger fruits with higher proportion of acidity and lower hardness.
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