Antagonistic Activity of Chilean Strains of Pseudomonas protegens Against Fungi Causing Crown and Root Rot of Wheat (Triticum aestivum L.)

Seed treatments with antagonistic bacteria could reduce the severity of crown and root rot diseases in wheat crops. The objective of this study was to evaluate the potential antagonistic activity of a bacterial consortium of three Chilean strains of Pseudomonas protegens against the wheat crown and...

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Published inFrontiers in plant science Vol. 11; p. 951
Main Authors Castro Tapia, María Paz, Madariaga Burrows, Ricardo P., Ruiz Sepúlveda, Braulio, Vargas Concha, Marisol, Vera Palma, Carola, Moya-Elizondo, Ernesto A.
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 25.06.2020
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Summary:Seed treatments with antagonistic bacteria could reduce the severity of crown and root rot diseases in wheat crops. The objective of this study was to evaluate the potential antagonistic activity of a bacterial consortium of three Chilean strains of Pseudomonas protegens against the wheat crown and root rot pathogens Gaeumannomyces graminis var. tritici , Rhizoctonia cerealis , and Fusarium culmorum . Two field experiments were carried out on artificially infested soil during two consecutive seasons (2016–2017 and 2017–2018) in an Andisol soil of southern Chile. Control treatments (not inoculated with fungi) were also included. Each treatment included a seed treatment of spring wheat cv. Pantera-INIA with and without the bacterial consortium. Both phytosanitary damage (incidence and severity) and agronomic components were evaluated. Bacterial populations with the phlD + gene in the wheat plant rhizosphere during anthesis state (Z6) were also quantified. In both seasons, infection severity decreased by an average of 16.8% in seeds treated with P. protegens consortium, while yield components such as spikes m −1 and number of grains per spike increased. The use of antagonistic bacteria resulted in a total yield increase only during the first experimental season (P < 0.05). In general, accumulated rainfall influenced the antagonistic effect of the consortium of P. protegens strains, accounting for the differences observed between the two seasons. The results suggest that this P. protegens consortium applied on seeds can promote plant growth and protect wheat crops against crown and root rot pathogens in Southern Chile under field conditions.
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This article was submitted to Plant Pathogen Interactions, a section of the journal Frontiers in Plant Science
Edited by: Maria Rosa Simon, Faculty of Agriculture and Forestry Sciences, National University of La Plata, Argentina
Reviewed by: Olga Mavrodi, Mississippi State University, United States; Linda Thomashow, Agricultural Research Service, United States Department of Agriculture, United States
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2020.00951