GA_3对柿果实成熟软化及细胞壁组分代谢的影响

Effect of GA_3 on ripening and cell wall component metabolism of persimmon fruit.

为探讨柿果实软化机理和延缓成熟软化的技术措施,以扁花柿为试材,研究了20℃下50 mg?kg-1的GA3处理对采后柿果实成熟软化和细胞壁组分代谢的影响.结果表明:GA3处理不但推迟柿果实呼吸高峰和乙烯高峰的出现,而且还抑制了柿果实PE、PG和-βGal酶活性的增加,延缓纤维素和原果胶降解以及水溶性果胶含量增加,保持果肉硬度.表明GA3可延缓柿果实的软化进程,延长贮藏期限.

Effect of GA3 on the ripening and cell wall component metabolism of persimmon fruit （Diospyros kaki L. cv. Bianhua） was investigated after the fruit was treated with 50 mg·kg^-1 GA3 for 10 minutes or not （control） at 20℃. Results showed that GA3 treatment not only significantly delayed the onset of ethylene production peaks and respiration climacteric in persimmon fruit, but also significantly retarded the activities of polygalacturonase （PG）, pectinesterase （PE）, β-galactosidase（β- Gal）and cellulase during storage. Consistent with the activity declining of cell wall hydrolase, GA3 treatment also delayed the depolymerization of propectin, cellulose and retarded the increasing of water soluble pectin （WSP） compared with the control fruit. The results suggest that application of GA3 can delay ripening and extend the postharvest life of persimmon fruit.