Combination of the biocontrol yeast Cryptococcus laurentii with UV-C treatment for control of postharvest diseases of tomato fruit
2013
Zhang, Changfeng | Chen, Kunsong | Wang, Guoli
Integrated management that combines different methods is being actively pursued in the control of postharvest disease. In this study, the biocontrol yeast Cryptococcus laurentii and ultraviolet-C (UV-C) treatment were evaluated for controlling infection following artificial inoculation with Botrytis cinerea or Alternaria alternata, and natural infection in tomato fruit. Applied separately, C. laurentii and UV-C (4 kJ m⁻²) effectively inhibited decay caused by B. cinerea or A. alternata, and natural infection. The combination of C. laurentii and UV-C showed better control efficiency. UV-C treatment did not affect yeast growth in fruit wounds, while the treatment induced the transcript expression of β-1,3-glucanase, phenylalanine ammonia-lyase, peroxidase and superoxide dismutase based on real-time PCR analysis, as well as increased the activity of these enzymes in tomato fruit. Results indicate that the mechanism by which UV-C enhanced the biocontrol efficacy of C. laurentii may be associated with the elicitation of defense response in tomato fruit.
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