摘要 : Acibenzolar-S-methyl (ASM) is a chemical activator of systematic resistance in many plants. The effects of postharvest dipping with different concentrations of ASM (50, 100, 200 and 300 mg/litre) on the incidence of decay in Hami ... 展开 Acibenzolar-S-methyl (ASM) is a chemical activator of systematic resistance in many plants. The effects of postharvest dipping with different concentrations of ASM (50, 100, 200 and 300 mg/litre) on the incidence of decay in Hami melon (cultivars New Queen and 8601) were studied. ASM at 200 mg/litre was the most effective in the reduction of decay severity caused by Alternaria alternata, Fusarium semitectum [F. pallidoroseum] and Trichothecium roseum. The higher concentration of ASM (300 mg/litre) failed to enhance resistance against decay-causing agents and caused phytotoxicity. ASM had no significant fungicidal effect in vitro and suppressed lesion diameter in treated fruits, indicating that disease resistance was induced. The efficacy of suppression against T. roseum lasted 7 and 10 days for New Queen and 8601, respectively. Protection provided by ASM was associated with the activation of peroxidase, chitinase and phenylalanine ammonia-lyase in treated fruits.. 收起