关键词: 葡萄, 库源关系, 叶果比, 花色苷, 果实品质, 主成分分析

Abstract: In order to explore the effect of sink-source relationship on anthocyanin accumulation and quality of Beimei grape,the ratio of leaf number to ear number of fruiting branches was adjusted before veraison as 18 leaves/ panicle(CK),10 leaves/panicle(T1),14 leaves/ panicle(T2),22 leaves/ panicle(T3) and 26 leaves/ panicle (T4),and the anthocyanin content in grape peel and fruit quality were determined.The results showed that compared with CK, increasing the ratio of leaf to fruit could significantly increase the contents of total soluble sugar and total phenol,decrease the contents of titratable acid and tannin,and increase the contents of total anthocyanins and five kinds of anthocyanins in grape peel.When the fruit was harvested,the total anthocyanin content in the pericarp treated with T3 and T4 was significantly increased compared with that of CK by 12.7% and 15.1%,respectively.Compared with CK, the contents of petunidin-3-O-glucoside, cyanidin-3-O-glucoside, delphinidin-3-O-glucoside,peonidin-3-O-glucoside and malvidin-3-O-glucoside in pericarp treated with T3 increased significantly by 22.6%,20.4%,59.4%,28.7% and 4.1%,respectively,and the contents of five anthocyanin monomers in pericarp treated with T4 increased significantly by 21.9%,9.3%,23.2%,16.5% and 14.4%,respectively. The principal component analysis of the fruit quality of Beimei grape showed that the first principal component contained the contents of peonidin-3-O-glucoside, delphinidin-3-O-glucoside, total soluble sugar,cyanidin-3-O-glucoside,the second principal component contained the contents of titratable acid and petunidin-3-O-glucoside.The comprehensive score of fruit quality of Beimei grape with different leaf-fruit ratio treatment was the highest in T3 treatment,followed by T4 treatment,and the lowest in T1 treatment.Therefore,in order to ensure the grape yield,it is suggested that the leaf-fruit ratio of grape
plant should be adjusted to 22 leaves/panicle,so as to improve the anthocyanin content in the pericarp and fruit quality of Beimei grape.

Key words: Grape, Sink-source relationship, Ratio of leaf number to ear number of fruiting branches;Anthocyanin, Fruit quality, Principal component analysis