WU Yuxia, LIU Yulian, MA Chaoling, MAO Juan, YANG Jiangshan, WANG Yanxiu, CHANG Yongyi
The quality of grape berries is greatly affected by the ecological environment.Under the delayed cultivation conditions in the alpine desert, the quality of berries is significantly different from that in open cultivation.The aim of this research is to verify and Compare the adaptability and quality performance of eight cultivars of table grape.It could provide a theoretical reference for the variety selection and quality identification of delay-cultivated grape in the alpine desert.Under the delayed cultivation conditions, the eight grape cultivars were preliminarily selected as the research object.The test cultivars were collected from the introduction greenhouses located in Tianzhu county.The experiment determined the berry sensory quality, intrinsic quality, efficacy components, sugar and organic acid composition and content.In order to improve the credibility of the analysis, the method of principal component analysis was adopted.The comprehensive quality of 8 cultivars were ranked according to the comprehensive scores.The results showed that, the fruit mass, vertical and horizontal diameter of ‘Red Globe’ and ‘Zidiqiu’ could maintain the original characteristics of large fruits.The berries of the seed cultivars were larger than the seedless.The fruit shape index of 8 cultivars was greater than 1, which were oval.Except for ‘Ruidu Xiangyu’, the peel color of other cultivars was darker.The darker the peel, the higher the content of anthocyanins, flavonoids and total phenols.In terms of intrinsic quality and active ingredients, ‘Ruby Seedless’, ‘Zitian Seedless’, and ‘Red Globe’ had higher soluble solids content, with an average content of more than 21%.No sucrose was detected in berry of 8 cultivars.The sugar components were mainly fructose and glucose.Glucose content was slightly lower than fructose.The main organic acids were tartaric acid and malic acid, and the content of citric acid and oxalic acid were extremely small.Fruit sweetness value showed that the taste ‘Ruby Seedless’ was the sweetest, followed by ‘Red Globe’, and the worst were ‘Moldova’.Using the method of principal component analysis, the quality indexes were converted into 5 independent principal components, which cumulative contribution rate was 93.150%.‘Ruby Seedless’, ‘Red Globe’ and ‘Muscat Hamburg’ had the best comprehensive quality among the 8 cultivars.
