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Identification of a novel strain, Streptomyces blastmyceticus JZB130180, and evaluation of its biocontrol efficacy against Monilinia fructicola

Ni, Mi, Wu, Qiong, Wang, Hong-li, Liu, Wei-cheng, Hu, Bin, Zhang, Dian-peng, Zhao, Juan, Liu, De-wen, Lu, Cai-ge
Journal of Zhejiang University 2019 v.20 no.1 pp. 84-94
Monilinia fructicola, Streptomyces blastmyceticus, biological control, chitinase, culture media, endo-1,4-beta-glucanase, median effective concentration, peaches, physicochemical properties, proteinases, temperature, toxicity testing, ultraviolet radiation
Peach brown rot, caused by Monilinia fructicola, is one of the most serious peach diseases. A strain belonging to the Actinomycetales, named Streptomyces blastmyceticus JZB130180, was found to have a strong inhibitory effect on M. fructicola in confrontation culture. Following the inoculation of peaches in vitro, it was revealed that the fermentation broth of S. blastmyceticus JZB130180 had a significant inhibitory effect on disease development by M. fructicola. The fermentation broth of S. blastmyceticus> JZB130180 had an EC₅₀ (concentration for 50% of maximal effect) of 38.3 μg/mL against M. fructicola, as determined in an indoor toxicity test. Analysis of the physicochemical properties of the fermentation broth revealed that it was tolerant of acid and alkaline conditions, temperature, and ultraviolet radiation. In addition, chitinase, cellulase, and protease were also found to be secreted by the strain. The results of this study suggest that S. blastmyceticus JZB130180 may be used for the biocontrol of peach brown rot.