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Effect of Cryptococcus laurentii and calcium chloride on control of Penicillium expansum and Botrytis cinerea infections in pear fruit

Yu, Ting, Yu, Chen, Lu, Huangping, Zunun, Mahbuba, Chen, Fangxia, Zhou, Tao, Sheng, Kuang, Zheng, Xiaodong
Biological control 2012 v.61 no.2 pp. 169-175
Botrytis cinerea, Cryptococcus laurentii, Penicillium expansum, biological control, calcium chloride, pears, peroxidase, yeasts
This study was conducted to evaluate the efficacy of the biocontrol yeast Cryptococcus laurentii and calcium chloride (CaCl₂) in suppressing the blue and gray mold rots in pear fruit wounds and the possible mechanisms involved. The results from the presented investigation showed that combined treatment of pear fruit wounds with C. laurentii and CaCl₂ was a much better approach for inhibition of Penicillium expansum and Botrytis cinerea infections than C. laurentii or CaCl₂ alone. CaCl₂ neither affected the growth of C. laurentiiin vitro or in vivo, nor directly inhibited the mold rots in pear fruit. However, CaCl₂ was shown to elicit the fruit resistance to mold rots when the time interval between CaCl₂-treatment and pathogen-inoculation was increased up to 24h, being associated with an activation of the peroxidase activity of pear fruit. Therefore, it could be proposed that the mechanism by which CaCl₂ reinforced the biocontrol efficacy of C. laurentii was mainly due to its ability to induce the fruit natural resistance.