Effect of jasmonic acid methylester treatment on blue mould and cell wall degrading enzymes activities in peach fruit

Peach fruit were used as materials to study the effects of jasmonic acid methylester(Me JA) treatment on blue mould of peach fruit and mycelia growth and spore germination of Penicillium expansum to screen the optimal concentration. The effect of Me JA treatment on cell wall degrading enzymes activities were also investigated in this paper. The results indicated that 100 μmol/L Me JA was the best concentration to control blue mould of peach fruit, and significantly( p ≤ 0. 05) inhibited mycelia growth and spore germination of P. expansum. The results also showed that the activity of cell wall degrading enzymes including polygalacturonase( PG), pectin methylesterase( PME), pectin methyl- trans- eliminase( PMTE), polygalacturonic acid trans-eliminase(PGTE) and β-glucosidase were inhibited by 100 μmol /L Me JA treatment. In conclusion,postharvest Me JA inhibited blue mould of peach fruit was related to delay fruit soft.