Study On Selection Of Suitable Paper Bag,Sugar Accumulation And Its Metabolism-Related Enzymes In Red Fuji Apple After Bagging

The experiment was carried on in red Fuji apple, which 16 and 12 kind of fruit bags was used in northern loess plateau of Shaanxi Weihe and Guanzhong fruit areas from 2003to2004. Meanwhile, the changes of carbohydrate content and the metabolism-related enzymes activity of fruit were measured after bagging. The aim was to select more better fruit bags for shaanxi fruit area and research the inherent physiology mechanism that the fruit bag lowered the inside qualities of fruit, which hoped perfecting the bagging technology and guiding the apple production. The results indicated as follows: 1. The double paper bag clearly improved the fruit outside quality, enhanced the content of anthocyanin, decreased the content of chlorophyll, accelerated fruit coloring; it also decreased the fruit rust index ,increased the clearness index, but they gave rise to unfavorable influence on fruit inside quality, such as lowering the content of sugar, acid and vitamin C, etc. The comprehensive results indicated that the better double paper bags were XunBao, Jing Gong, GuangLiangâ…¡, GuangLiangâ… , SanQin, XiaoLin, ZhaoFeng , QingHe in LuoChuan and XiaoLin, SanQin, JingGong, ShenNong, GuangLiangâ… in YangLing, they were more suitable to Shaanxi fruit area than other paper bag. 2. The chlorophyll content in bagging apple fruit skin was lower than control. Among them, Chl.a was lowered most and it was parallel with total chlorophyll content. The capacity of carrotenoid was lowered little, which is more advantageous to the fruit coloring. The content of anthocyanin was notably lower than control during the purity. After 3 days of bag removal, It was rapidly increased and surpassed the control after 6 days of bag removal. when harvesting, the anthocyanin content of bagging fruit surpassed control more than one times. 3. The fruit bagging influenced the content of the carbohydrate. The experiment indicated that the titratable acid is notably lowered in red Fuji apple after bagging. It was lowered in the content of various soluble sugar( total sugar, reducing sugar, sucrose, fructose, glucose) and the starch to some extent. There is the same change trend between bagging and control. 4. Correspondingly, the bagging greatly influenced the activity of the metabolism-related enzymes. The result indicated the activity of sucrose phosphate synthase(SPS), sucrose synthase(SS), neutral invertase(NI), acid invertase(AI) and amylase is almost lower than control during the bagging course. There was bigger wave range in activity of SPS and SS in control and the raising trend along with the fruit ripen, but the change wave in bagging fruit is not big during the whole growth period. The activity of NI, AI and amylase is gradually reduced from bagging to harvest, the same trend as control.