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Braz J Microbiol

Title:		Diffusible and volatile organic compounds produced by avocado rhizobacteria exhibit antifungal effects against Fusarium kuroshium
Author(s):		Guevara-Avendano E; Bravo-Castillo KR; Monribot-Villanueva JL; Kiel-Martinez AL; Ramirez-Vazquez M; Guerrero-Analco JA; Reverchon F;
Address:		"Red de Estudios Moleculares Avanzados, Instituto de Ecologia, A.C., Carretera antigua a Coatepec 351, Col. El Haya, 91070, Xalapa, Veracruz, Mexico. Instituto de Agroindustrias, Universidad Tecnologica de la Mixteca, 69000, Huajuapan de Leon, Oaxaca, Mexico. Facultad de Ciencias Quimicas, Universidad Veracruzana, 94340, Orizaba, Veracruz, Mexico. Red de Estudios Moleculares Avanzados, Instituto de Ecologia, A.C., Carretera antigua a Coatepec 351, Col. El Haya, 91070, Xalapa, Veracruz, Mexico. joseantonio.guerrero@inecol.mx. Red de Estudios Moleculares Avanzados, Instituto de Ecologia, A.C., Calle Prol. Lazaro Cardenas 253, Col. Centro, 61600, Patzcuaro, Michoacan, Mexico. frederique.reverchon@inecol.mx"
Journal Title:		Braz J Microbiol
Year:		2020
Volume:		20200312
Issue:		3
Page Number:		861 - 873
DOI:		10.1007/s42770-020-00249-6
ISSN/ISBN:		1678-4405 (Electronic) 1517-8382 (Print) 1517-8382 (Linking)
Abstract:		"Rhizobacteria emit bioactive metabolites with antifungal properties that could be used for biocontrol of fungal diseases. In this study, we evaluated the potential of diffusible and volatile organic compounds (VOCs) emitted by avocado rhizobacteria to inhibit the growth of Fusarium kuroshium, one of the causal agents of Fusarium dieback (FD) in avocado. Three bacterial isolates (INECOL-6004, INECOL-6005, and INECOL-6006), belonging to the Bacillus genus, were selected based on their capacity to inhibit several avocado fungal pathogens, and tested in antagonism assays against F. kuroshium. The three bacterial isolates significantly inhibited F. kuroshium mycelial growth by up to 48%. The composition of bacterial diffusible compounds was characterized by the analysis of EtOAc and n-BuOH extracts by using ultra-performance liquid chromatography (UPLC) coupled to high-resolution mass spectrometry (HRMS). The three bacterial isolates produced cyclo-lipopeptides belonging to the iturin, fengycin, and surfactin families. The antifungal activity of n-BuOH extracts was larger than that of EtOAc extracts, probably due to the greater relative abundance of fengycin in the former than in the latter. In addition, isolates INECOL-6004 and INECOL-6006 significantly inhibited F. kuroshium mycelial growth through VOC emission by up to 69.88%. The analysis of their VOC profiles by solid phase micro-extraction (SPME) coupled to gas chromatography and mass spectrometry (GC-MS) revealed the presence of ketones and pyrazine compounds, particularly of 2-nonanone, which was not detected in the VOC profile of isolate INECOL-6005. These results emphasize the need to further investigate the antifungal activity of each bioactive compound for the development of new formulations against fungal phytopathogens"
Keywords:		Antibiosis Antifungal Agents/chemistry/metabolism/*pharmacology Bacillus/isolation & purification/metabolism Fusarium/*drug effects/growth & development Lipopeptides/chemistry/metabolism/pharmacology Mycelium/drug effects/growth & development Persea/*micr;
Notes:		"MedlineGuevara-Avendano, Edgar Bravo-Castillo, Karla R Monribot-Villanueva, Juan L Kiel-Martinez, Ana L Ramirez-Vazquez, Monica Guerrero-Analco, Jose A Reverchon, Frederique eng 2016/agreement SENASICA-INECOL/ 292399/(Fondo Nacional de Desarrollo Cientifico y Tecnologico or FORDECyT/ Brazil 2020/03/14 Braz J Microbiol. 2020 Sep; 51(3):861-873. doi: 10.1007/s42770-020-00249-6. Epub 2020 Mar 12"