果树学报2011，Vol.28Issue(3)：428-432,5.
饥饿胁迫对龙眼果实脱落及糖代谢的影响
Effects of starvation stress on fruit abscission and sugar metabolism in longan
摘要
Abstract
Effects of carbohydrate starvation stress created by girdling plus defoliation made on bearing shoots on sugar contents and composition and the activities of sugar metabolism-related enzymes in fruit were investigated in longan (Dimocarpus Longana Lout.) cv. Chuliang. Girdling plus defoliation treatment was carried out on bearing shoots at two fruit developmental stages, ie. the middle stage (May 22, 2009)and the late stage (June 22, 2009) and changes in fruit drop rate, sugar contents and related enzymes were observed or analyzed. The results showed that girdling plus defoliation on bearing shoots interrupted the supply of carbon nutrition to fruit and caused severe fruit abscission. The treatment also induced a significant decline in soluble sugar concentrations in fruit at both stages, but fruit sugars were not fully depleted.It was suggested that there might be a threshold sugar level in fruit, below which fruit abscission occurs.Starvation stress also led to the changes in sugar composition. The relative declines of sucrose and glucose were higher than that of fructose. Sucrose degradation enzymes (invertase and sucrose synthase) increased within 2 d after starvation stress, but with the decreasing of sucrose in fruit, activities of these enzymes decreased. The activity of sucrose phosphate synthase (SPS) that catalyzes sucrose synthesis was not significantly affected by starvation.关键词
龙眼/落果/糖代谢/转化酶/蔗糖合成酶/蔗糖磷酸合成酶Key words
Longan/ Abscission/ Carbohydrate metabolism/ Invertase/ Sucrose synthase/ Sucrose phosphate synthase分类
农业科技引用本文复制引用
杨子琴,李茂,章笑赟,余意,王惠聪,黄旭明..饥饿胁迫对龙眼果实脱落及糖代谢的影响[J].果树学报,2011,28(3):428-432,5.基金项目
国家自然科学基金项目(30871693) （30871693）
