关键词: 脐橙, 果实, 果胶甲酯酶, 多聚半乳糖醛酸酶, &beta, -葡萄糖苷酶, 纤维素酶

Abstract: Navel orange (Citrus sinensis cvs.Robertson,Fengqi and Newhall) were chosen as testing materials in Zhoupo,Jingyan County.The studies of pectinmethylesterase (PE),polygalacturonase (PG),β-glycosidase and cellulase in navel orange during development of fruits were shown as follows.PE,PG and β-glycosidase could be tested at different stages.PE activity of pulp was greater than that of peel obviously,the changes of PE activities from Newhall and Robertson navel oranges had three peaks;PE activity of Newhall varied greatly than those of Robertson and Fengqi.PG activity was greater at maturity stage than at young and the expanding stages;PG activity in pulp was greater than in peel.β-glycosidase activity was tested firstly in fruits and the peak of β-glycosidase activity was at maturity stage.The peak of PE activity appeared earlier than those of PG and β-glycosidase.PE and PG were the major enzymes effected the development of navel orange fruits.

Key words: Navel orange, fruit, pectinmethylesterase, polygalacturonase, β-glycosidase, cellulase