EFFECTS OF GROWTH REGULATOR TREATMENT ON POST HARVEST QUALITY OF BANANA(GAOZHOU‘ AI)FRUITS Cloning, Characterization and Expression of Alcohol Acyltransferase Gene which Responses to Exogenous Ethylene in Peach Fruit Aroma Volatiles Biosynthesis and Relative Enzyme Activities Regulated by Exogenous Ethylene in Peach Fruits Stored at Low Temperature