Effects of bagging on fruit coloration and phenylalanine ammonia lyase and polyphenol oxidase in 'Feizixiao' litchi.

摘要

In a field trial conducted in Guangdong, China during 997/98, fruit of litchi (Litchi chinensis) cv. Feizixiao litchi were bagged in cellophane paper, adhesive-bonded fabric, newspaper and craft paper 15 or 30 days after the blooming stage, and de-bagged 10 days before or during harvest. Cellophane or fabric bags advanced fruit colouration by 10 days compared with de-bagged fruits. It is recommended that fruits should be bagged 15 days after full bloom stage until harvest. Diffused light with 70% full sunlight promoted the colouration of Feizixiao. The effect of bagging on colouration is associated with the metabolism of phenols and flavonoids, and the activities of phenylalanine ammonia lyase and polyphenol oxidase [catechol oxidase] as well.