| Abstract: | Fruits from 9-year-old apple trees (Malus domestic Borkh. cv. Fuji) were wrappedby two-layer bag in middle of June, and bags were removed in middle of September. The bag-removed treatment was performed in following three ways: once-removing all inner and outer bags; twice-removing bag (removing inner bag 3 d after removing outer bag); dipping 5 s in 1 mM salicylic acid (SA)after once-removing all bags. Changes of phenolic compounds in fruit peel in response to light environment were studied before or after removing bag. The results showed that the bagged treatment could significantly decrease the contents of UV (ultraviolet) absorbing compounds,rutin and anthocyanins of the fruit peel, but increased chlorogenic acid level. After removal of bag, the level of SA and quercetin in the fruit peel appeared peak 1 d after bag-removed,except that quercetin was decreased in SA-treated fruits. UVabsorbing compounds, anthocyanins and rutin were kept increasing all along after the removal of bag, except that chlorogenic acid was decreased during being retained inner bag in the treatment of twice removing bag. The positive correlations existed between changes of UV absorbing compounds and changes of anthocyanins or rutin. It was suggested that light played an important role in phenolics metabolism. |
