Inhibition of green mold disease in mandarins by preventive applications of methyl jasmonate and antagonistic yeast Cryptococcus laurentii

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• 作者：Jun Guo ; Weiwen Fang ; Huangping Lu ; Ruiyu Zhu ; Laifeng Lu ; Xiaodong Zheng ; Ting Yu
• 关键词：Biocontrol ; Citrus fruit ; Cryptococcus laurentii ; MeJA ; Penicillium digitatum
• 刊名：Postharvest Biology and Technology
• 出版年：February, 2014
• 年：2014
• 卷：88
• 期：Complete
• 页码：72-78
• 全文大小：1687 K

文摘

The objective of this study was to evaluate the preventive activity of methyl jasmonate (MeJA) alone and in combination with antagonistic yeast in suppressing green mold decay in citrus fruit, and to explore the mechanisms involved. At 100 渭mol/L, MeJA inhibited disease incidence and lesion diameter of mold decay compared with the control (P < 0.05) The preventive application of Cryptococcus laurentii at 1 脳 10⁸ cells/mL combined with 100 渭mol/L MeJA reduced green mold incidence compared to the control and the other treatment groups (P < 0.05) when tested in wounded citrus fruit inoculated with Penicillium digitatum. MeJA and C. laurentii induced higher activity of polyphenol oxidase, peroxidase and catalase than control. Moreover, treatment with MeJA and C. laurentii induced a rise in the mRNA expression level of PR5 (pathogenesis-related protein family 5), which was stronger than in the single-treatment groups and the control. In addition, 100 渭mol/L MeJA improved the rapid proliferation of C. laurentii in citrus fruit wounds. This combined treatment can induce natural resistance and stimulate the proliferation of antagonistic yeast on the fruit surface.