Different strategies to kill the host presented byMetarhizium anisopliaeandBeauveria bassiana

Author:

Rustiguel Cynthia Barbosa1,Fernández-Bravo María2,Guimarães Luis Henrique Souza1,Quesada-Moraga Enrique2

Affiliation:

1. Department of Biology, Faculty of Philosophy, Science and Letters from Ribeirão Preto, University of São Paulo, Avenida Bandeirantes 3900, 14040-901 Ribeirão Preto, Monte Alegre, São Paulo, Brazil.

2. Department of Agricultural and Forestry Sciences, ETSIAM, University of Cordoba, Campus of Rabanales, C4 Building, 14071 Cordoba, Spain.

Abstract

Studies conducted over the last decades have shown the potential of entomopathogenic fungi for the biocontrol of some insect pests. Entomopathogenic fungi infect their host through the cuticle, so they do not need to be ingested to be effective. These fungi also secrete secondary metabolites and proteins that are toxic to insect pests. In this context, we analyzed the pathogenicity of Metarhizium anisopliae (Metschn.) strains IBCB 384 and IBCB 425 and Beauveria bassiana (Bals.-Criv.) Vuill. strains E 1764 and E 3158 against Galleria mellonella (Linn.) larvae, during pre-invasion and post-invasion phases. The results showed M. anisopliae, especially strain IBCB 384, was most virulent in the pre-invasion phase against G. mellonella, whereas B. bassiana, especially strain E 1764, was most virulent in the post-invasion phase. During in vivo development and in the production of toxic serum, B. bassiana E 3158 was the most virulent. Different fungal growth (or toxin) strategies were observed for studied strains. Metarhizium anisopliae IBCB 425 prioritizes the growth strategy, whereas strain IBCB 384 and B. bassiana strains E 1764 and E 3158 have a toxic strategy. All strains have pathogenicity against G. mellonella, indicating their possible use for biocontrol.

Publisher

Canadian Science Publishing

Subject

Genetics,Molecular Biology,Applied Microbiology and Biotechnology,General Medicine,Immunology,Microbiology

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