Food Science and Technology. 2011, (05) Core

Inhibition of postharvest green mold decay and induction of disease resistance by P. membranaefaciens in Chinese bayberry fruitChinese Full Text

WANG Kai-tuo1,2, ZHENG Yong-hua2 (1.Department of Biology, Chongqing Three Gorges University, Chongqing 404100; 2.College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095)

Abstract: The effects of Pichia membranaefaciens on green mold decay caused by Penicillium citrinum on postharvest Chinese bayberry fruit and its relation to the induced disease resistance were investigated in this study. The fruit were pretreated with 1×109 cfu/ mL of washed cell suspensions of the yeast （15 L） and allowed to dry for 1 h. Then the wounds were then inoculated with 15 L of 1.0×105 cfu/mL suspension of P. citrinum. Afterwards the fruits were incubated at 1 ℃ for 8 d. The disease incidence and lesion diameter, activities of defense-related enzymes including chitinase, -1, 3-glucanase, peroxidase（POD）, polyphenol oxidase（PPO） and phenylalanine ammonia-lyase（PAL）, and total phenolic content as well as effects of P. membranaefaciens on spore germination and germ tube elongation of the pathogen were determined at 2-day intervals during incubation. The results showed P. membranaefaciens significantly inhibited disease development, and induced the activities of chitinase, -1,3-glucanase, POD, PPO and PAL enhanced total phenolic content. In addition, the in vitro experiment showed that P. membranaefaciens signicantly inhibited spore germination and germ tube elongation of P. citrinum. Thus, these results indicate that P. membranaefaciens can effectively reduce fruit decay possibly by directly inhibiting pathogen growth and indirectly inducing disease resistance.

Keywords：

Chinese bayberry; disease; P. membranaefaciens; P. citrinum; inducing disease resistance;

DOI：
10.13684/j.cnki.spkj.2011.05.002
Series：
Subject：
Classification Code：
S436.67

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Inhibition of postharvest green mold decay and induction of disease resistance by P. membranaefaciens in Chinese bayberry fruitChinese Full Text

WANG Kai-tuo1,2, ZHENG Yong-hua2 (1.Department of Biology, Chongqing Three Gorges University, Chongqing 404100; 2.College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095)

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