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C.H. Li
C.H. Li
College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404100, P.R. China
Chinese-Hungarian Cooperative Research Centre for Food Science, Southwest University, Chongqing 400715, P.R. China
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Chinese-Hungarian Cooperative Research Centre for Food Science, Southwest University, Chongqing 400715, P.R. China
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M.Y. Du
M.Y. Du
Chinese-Hungarian Cooperative Research Centre for Food Science, Southwest University, Chongqing 400715, P.R. China
College of Food Science, Southwest University, Chongqing 400715, P.R. China
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College of Food Science, Southwest University, Chongqing 400715, P.R. China
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K.T. Wang
wangkaituo83@gmail.com
K.T. Wang
College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing 404100, P.R. China
Chinese-Hungarian Cooperative Research Centre for Food Science, Southwest University, Chongqing 400715, P.R. China
College of Food Science, Southwest University, Chongqing 400715, P.R. China
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Chinese-Hungarian Cooperative Research Centre for Food Science, Southwest University, Chongqing 400715, P.R. China
College of Food Science, Southwest University, Chongqing 400715, P.R. China
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This study was conducted to assess the effects of 2,4-epibrassionolide (EBR) on mold decay caused by Rhizopus stolonifer and its capability to activate biochemical defense reactions in postharvest peaches. The treatment of EBR at 5 μM possessed the optimum effectiveness on inhibiting the Rhizopus rot in peach fruit among all treatments. The EBR treatment significantly up-regulated the expression levels of a set of defense-related enzymes and PR genes that included PpCHI, PpGns1, PpPAL, PpNPR1, PpPR1 and PpPR4 as well as led to an enhancement for biosynthesis of phenolics and lignins in peaches during the incubation at 20 °C. Interestingly, the EBR-treated peaches exhibited more striking expressions of PR genes and accumulation of antifungal compounds upon inoculation with the pathogen, indicating a priming defense could be activated by EBR. On the other hand, 5 μM EBR exhibited direct toxicity on fungal proliferation of R. stolonifer in vitro. Thus, we concluded that 5 μM EBR inhibited the Rhizopus rot in peach fruit probably by a direct inhibitory effect on pathogen growth and an indirect induction of a priming resistance. These findings provided a potential alternative for control of fungal infection in peaches during the postharvest storage.
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