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Food Microbiol

Title:		Biocontrol ability and action mechanism of Metschnikowia citriensis against Geotrichum citri-aurantii causing sour rot of postharvest citrus fruit
Author(s):		Wang S; Ruan C; Yi L; Deng L; Yao S; Zeng K;
Address:		"College of Food Science, Southwest University, Chongqing, 400715, PR China. College of Food Science, Southwest University, Chongqing, 400715, PR China; Food Storage and Logistics Research Center, Southwest University, Chongqing, 400715, PR China. College of Food Science, Southwest University, Chongqing, 400715, PR China; Food Storage and Logistics Research Center, Southwest University, Chongqing, 400715, PR China. Electronic address: zengkaifang@hotmail.com"
Journal Title:		Food Microbiol
Year:		2020
Volume:		20191108
Issue:
Page Number:		103375 -
DOI:		10.1016/j.fm.2019.103375
ISSN/ISBN:		1095-9998 (Electronic) 0740-0020 (Linking)
Abstract:		"This study investigated the biocontrol efficiency of Metschnikowia citriensis strain FL01 against Geotrichum citri-aurantii, and evaluated possible mechanisms. The results showed that M. citriensis could effectively control the development of sour rot, and significantly inhibit the mycelial growth and spore germination of G. citri-aurantii. The population dynamics results and Scanning electron microscopy (SEM) analysis indicated that M. citriensis could rapidly colonize wounds and tightly adhere to the surface of the wounds to compete with G. citri-aurantii for nutrition and space. M. citriensis also showed the biofilm formation action in vitro. The response of G. citri-aurantii to different components of M. citriensis culture showed that only the yeast cells but not the extracellular metabolites and the volatile organic compounds (VOCs) exhibited inhibitory effect on the growth of G. citri-aurantii. M. citriensis adhered to the hyphae of G. citri-aurantii loosely and sparsely, and the production of lytic enzymes beta-1, 3-glucanase (GLU) and Chitinase (CHI) could not be induced by G. citri-auranti. Iron affected the pulcherrimin pigment production and antagonism of M. citriensis indicating iron depletion as the most important antagonistic mechanism. Besides, M. citriensis also induced resistance of fruit against sour rot. These results suggested that M. citriensis could be used as the potential alternative of fungicides to control postharvest pathogens on citrus fruit"
Keywords:		*Antibiosis Citrus/*microbiology Fruit/microbiology Geotrichum/*growth & development/physiology Metschnikowia/growth & development/*physiology Plant Diseases/*microbiology Citrus Geotrichum citri-aurantii Iron depletion Metschnikowia citriensis Sour rot;
Notes:		"MedlineWang, Shupei Ruan, Changqing Yi, Lanhua Deng, Lili Yao, Shixiang Zeng, Kaifang eng England 2020/01/18 Food Microbiol. 2020 May; 87:103375. doi: 10.1016/j.fm.2019.103375. Epub 2019 Nov 8"