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PLoS One

Title:		Plant growth-promoting rhizobacteria associated with avocado display antagonistic activity against Phytophthora cinnamomi through volatile emissions
Author(s):		Mendez-Bravo A; Cortazar-Murillo EM; Guevara-Avendano E; Ceballos-Luna O; Rodriguez-Haas B; Kiel-Martinez AL; Hernandez-Cristobal O; Guerrero-Analco JA; Reverchon F;
Address:		"CONACYT-Escuela Nacional de Estudios Superiores, Laboratorio Nacional de Analisis y Sintesis Ecologica, Universidad Nacional Autonoma de Mexico; Morelia, Michoacan, Mexico. Facultad de Ingenierias y Ciencias Quimicas, Quimica Farmaceutica Biologica, Universidad Veracruzana; Xalapa, Veracruz, Mexico. Red de Estudios Moleculares Avanzados, Instituto de Ecologia, A.C.; Xalapa, Veracruz, Mexico. Facultad de Biologia, Universidad Veracruzana; Xalapa, Veracruz, Mexico. Escuela Nacional de Estudios Superiores, Laboratorio de Microscopia, Universidad Nacional Autonoma de Mexico; Morelia, Michoacan, Mexico"
Journal Title:		PLoS One
Year:		2018
Volume:		20180320
Issue:		3
Page Number:		e0194665 -
DOI:		10.1371/journal.pone.0194665
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"Rhizobacteria associated with crops constitute an important source of potentially beneficial microorganisms with plant growth promoting activity or antagonistic effects against phytopathogens. In this study, we evaluated the plant growth promoting activity of 11 bacterial isolates that were obtained from the rhizosphere of healthy avocado trees and from that of avocado trees having survived root rot infestations. Seven bacterial isolates, belonging to the genera Bacillus, Pseudomonas and Arthrobacter, promoted in vitro growth of Arabidopsis thaliana. These isolates were then tested for antagonistic activity against Phytophthora cinnamomi, in direct dual culture assays. Two of those rhizobacterial isolates, obtained from symptomatic-declining trees, displayed antagonistic activity. Isolate A8a, which is closely related to Bacillus acidiceler, was also able to inhibit P. cinnamomi growth in vitro by 76% through the production of volatile compounds. Solid phase microextraction (SPME) and analysis by gas chromatography coupled with mass spectrometry (GC-MS) allowed to tentatively identify the main volatiles emitted by isolate A8a as 2,3,5-trimethylpyrazine, 6,10-dimethyl-5,9-undecadien-2-one and 3-amino-1,3-oxazolidin-2-one. These volatile compounds have been reported to show antifungal activity when produced by other bacterial isolates. These results confirm the significance of rhizobacteria and suggest that these bacteria could be used for biocontrol of soil borne oomycetes through their volatiles emissions"
Keywords:		Antibiosis/drug effects/*physiology Persea/growth & development/*microbiology Phytophthora/*drug effects Plant Development/drug effects/physiology Plant Roots/drug effects/growth & development/microbiology Rhizobiaceae/metabolism/*physiology *Rhizosphere;
Notes:		"MedlineMendez-Bravo, Alfonso Cortazar-Murillo, Elvis Marian Guevara-Avendano, Edgar Ceballos-Luna, Oscar Rodriguez-Haas, Benjamin Kiel-Martinez, Ana L Hernandez-Cristobal, Orlando Guerrero-Analco, Jose A Reverchon, Frederique eng Research Support, Non-U.S. Gov't 2018/03/21 PLoS One. 2018 Mar 20; 13(3):e0194665. doi: 10.1371/journal.pone.0194665. eCollection 2018"