FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (22): 286-291.

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Induction of Disease Resistance to Gray Mold by Pichia membranaefaciens in Postharvest Strawberry Fruit

ZHANG Lu,ZHANG Yao,LIU Li-dan,ZENG Kai-fang   

  1. 1. College of Food Science, Southwest University, Chongqing 400715, China;
    2. Laboratory of Quality and Safety Risk Assessment for Agro-products on Storage and Presevation (Chongqing),Ministry of Agriculture, Chongqing 400715, China
  • Received:2013-05-22 Revised:2013-10-25 Online:2013-11-25 Published:2013-12-05

Abstract:

Strawberry is highly susceptible to pathogen infection during storage, and gray mold caused by Botrytis cinerea
is one of the common diseases of strawberry fruit. The ability of the yeast Pichia membranaefaciens to control gray mold
of strawberry fruit during storage were examined in this study. The possible biocontrol mechanism of P. membranaefaciens
was also discussed. It was showed that there was a positive correlation between yeast concentration and the effect of disease
control. Treatment with 1 × 107 CFU/mL P. membranaefaciens suspension resulted in lower disease incidence of gray mold, and
had no harm to the epidermis. The fruit treated with P. membranaefaciens demonstrated accumulated activities of defense-related
enzymes such as β-1,3-glucanase (GLU), phenylalanine ammonia-lyase (PAL) and peroxidase (POD) in strawberry fruit. These
results indicated that P. membranaefaciens could effectively reduce the incidence of gray mold in strawberry. The induction of
resistance was one of the most important mechanisms of P. membranaefaciens control of strawberry gray mold.

Key words: Pichia membranaefaciens, strawberry, induced disease resistance, gray mold

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