【摘要】 本研究结果表明 ,增施氮肥后汁囊中光合产物的分配量减少 ,ABA/IAA的比值降低 ,蔗糖代谢相关酶 (特别是分解酶类 )的活性增加 ,最终造成了汁囊中的糖含量降低。对处理引起汁囊中糖含量变化的生理机制进行了探讨。更多还原

【Abstract】 Urea was applied at the root of Citrus unshiu on the 27th of June and the 5th of september(once 0 5kg urea/fruit tree).Sugar accumulation,contents of ABA and IAA,content of organic acid,distribution of 14 C\|photosynthates from source leaf in fruit and the activities of sucrose\|metabolizing enzymes were investigated in juice sacs of treatment and control satsuma mandarin fruits respectively.The results showed that the treatment of urea reduced partitioning of 14 C\|photosynthates into juice sacs of satsuma mandarin fruit,decreased the ratio of ABA/IAA,increased the activities of sucrose metabolizing enzymes(especially the activities of enzymes on sucrose cleavage).These factors may finally result in reducing the content of sugar in juice sacs of satsuma mandarin fruit.更多还原