关键词: 脐橙, 糖积累, 蔗糖合成酶, 蔗糖磷酸合成酶

Abstract: The activity changes of enzymes related to sucrose accumulation during "Robertson Navel" fruit development and their relationships with the sugar accumulation were studied. The results show that before 150 days after anthesis(DAA) and after 150 DAA, the key enzymes of sugar accumulation are sucrose phosphate synthase and sucrose synthase(synthetic direction) due their activities and sugar content are significant correlation, respectively. The sucrose synthase activity including synthetic direction and cleavage direction have a similar variance curve, and when the activities of sucrose phosphate synthase and sucrose synthase(synthetic direction) increase gradually, the sucrose synthase activity(cleavage direction) rises again correspondently, thus, sucrose synthase(cleavage direction) is important to sugar accumulation due, it adjusts fruit sink strength by regulating sucrose content in fruit.

Key words: Navel orange, sugar accumulation, sucrose synthase, sucrose phosphate synthase