Effect of methyl jasmonate on in vitro strawberry ripening.

摘要

Strawberry fruits (Fragaria X ananassa cv. Camarosa), were harvested at green immature stages and grown on media containing 88 mm sucrose in a growth chamber with photoperiod 16 h, RH 85%, dayight temperature 25/15deg C and light flux 300μmol m-2s-1. The effect of added methyl jasmonate (JAMe, 50μM) on in vitro development and ripening of strawberry was evaluated through different parameters. A significant increase in respiratory activity and ethylene production was detected in white and pink strawberries treated with JAMe, while different responses were elicited from ripe and overripe fruits. A higher growth rate was found in JAMe-treated fruits, with a 55% weight gain against 33% for control fruits. A significant effect of JAMe treatment on strawberry colour development was also observed: stimulation of anthocyanin biosynthesis occurred after 2 days of treatment, with accelerated degradation of chlorophyll a, chlorophyll b and, to a lesser extent, beta-carotene and lutein [xanthophyll].