Resumo

BAUTISTA-GALVEZ, A et al. Genetic characterisation of Metarhizium anisopliae (Metchnikoff) Sorokin isolates from sugarcane fields and their pathogenicity against Aeneolamia postica (Walker) (Hemiptera: Cercopidae). Universidad y ciencia [online]. 2012, vol.28, n.3, pp.217-229. ISSN 0186-2979.

A commercial strain of Metarhizium anisopliae (Metchnikoff) Sorokin was used by farmers in 2005 to control the sugarcane froghopper Aeneolamia postica (Walker) in Los Ríos, Tabasco, Mexico. The persistence and the effect of this introduced isolate on the genetic diversity and pathogenicity of the native fungus population are unknown. The purpose of this study was to characterise the genetic diversity and pathogenicity of M. anisopliae isolates collected from sugarcane fields in the region. The Galleria baiting method was used to sample the fungus from the soil, whereas the insect netting method was used to capture adults infected by A. postica. Samples were collected from a total of 33 sugarcane fields. Ten isolates of M. anisopliae were obtained, three in 2007 and seven in 2008; seven isolates were collected near the Usumacinta river. Random amplified polymorphic DNA markers and amplified ribosomal DNA restriction analysis of the 10 isolates revealed the presence of seven subgroups. Two of the isolates obtained in 2008 were genetically similar to the commercial strain used in 2005. At least two genotypes of M. anisopliae were found in this region. No clear relationship between genotype similarity and isolate pathogenicity against A. postica was recorded. Some of the native M. anisopliae isolates are promising candidates as agents of biological control against A. postica.

Palavras-chave : Sugarcane; entomopathogenic fungi; biological control; molecular characterisation; pathogenicity.

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