Objective The study aims to comprehensively evaluate the fruit quality of grape cultivar resources in Turpan-Hami region of Xinjiang,to provide a scientific basis for the breeding of high-quality grape varieties and the comprehensive utilization of cultivar resources. Method 110 grape cultivars from the Turpan-Hami region were adopted as research subject,and 20 quality indicators related to fruit color,texture,and nutritional content were measured.The correlation analysis,cluster analysis,principal component analysis (PCA),and fuzzy set analysis were used to systematically evaluate the comprehensive quality of the grape cultivar resources. Result Significant difference was observed in fruit color of 110 grape cultivars.The mean L* value of the fruit peel was 29.07,while that of the fruit flesh was 28.13,with coefficients of variation(CV) being 16.22% and 29.90%,respectively.The coefficients of variation for the six fruit-texture parameters-hardness,chewiness,gumminess,springiness,cohesiveness,and resilience-ranged from 5.52% to 45.78%.The soluble sugar content of the 110 grape cultivars ranged from 9.21 % to 21.74 %,the titratable acid content from 0.11% to 0.64%,and the vitamin C (VC) content from 13.33-292.50 g/kg.The CV for fruit phenolic substance ranked,in descending order,as follows:total anthocyanins,tannins,total flavonoids,and total phenols.The cluster weight ranged from 124.54 to 1 220.12 g.The a* and b* values of the grape fruit peel and pulp were significantly or highly significantly negatively correlated with the content of phenolic substances.Fruit hardness,chewiness,gumminess,and cluster weight were highly significantly positively correlated.The titratable acid content was highly significantly positively correlated with fruit springiness,cohesiveness,resilience,and significantly positively correlated with total anthocyanin content,but was highly significantly negatively correlated with fruit hardness.The contents of fruit total phenols,total flavonoids,tannins,and total anthocyanins were highly significantly positively correlated.According to the results of cluster analysis of fruit quality traits,110 grape cultivars could be divided into 7 groups,and each group showed different quality characteristics.Six principal components were determined in PCA,with a cumulative variance contribution rate of 73.97%,and 12 key traits including fruit hardness,gumminess,total anthocyanin content,VC content,resilience,titratable acid content,cohesiveness,and soluble sugar content,fruit peel b*,fruit pulp L*,fruit peel L*,fruit pulp b* were selected as the main indicators for evaluating grape resources.The comprehensive quality score (D) of the grape resources ranged from 0.207 to 0.721. Conclusion The fruit quality traits of 110 grape cultivar resources in the Turpan-Hami region of Xinjiang exhibit great genetic diversity,and there are significant correlations among indicators such as fruit color,texture,and nutrition.Fruit hardness,gumminess,total anthocyanin content,etc.could be selected as the main indicators for evaluating grape cultivar resources.‘Otilia seedless’,‘Heiqi seedless’,‘Huozhouziyu’,‘Bofaer’ and ‘Kelinbamake (Huangshao)’ can be considered as priority candidate resources for grape variety improvement in the Turpan-Hami region of Xinjiang.
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