Biocontrol potential and genetic diversity of Metarhizium anisopliae lineage in agricultural habitats.

AIMS

To assess phylogenetic and genotypic diversity of Metarhizium anisopliae lineage within diverse agroecosystems in the Karnataka State of India and to compare their chitinase activity and pathogenicity against insect pest of field crops subterranean termite, Odontotermes obesus.

METHODS AND RESULTS

Three phylogenetic and 27 microsatellite markers were used to assess the genetic diversity of M. anisopliae lineage within multiple agroecosystems. Multilocus phylogeny of the Metarhizium isolates identified two species: Metarhizium pingshaense and Metarhizium guizhouense. Multilocus phylogeny and microsatellite markers resolved two phylogenetic species of M. pingshaense, Mp_1 and Mp_2, and one phylogenetic species of M. guizhouense, Mg_1. Phylogenetic species, Mp_2 and Mg_1, were detected with one genotype each and Mp_1 with eleven genotypes. Metarhizium pingshaense GKVK 02_16 isolate caused significantly high mortality of O. obesus in bioassays and detected with high chitinase activity.

CONCLUSIONS

The study revealed phylogenetic and genotypic diversity of M. anisopliae lineage in agroecosystems of Karnataka State. Findings of pathogenicity and chitinase activity suggest that M. pingshaense GKVK 02_16 isolate provides effective control of O. obesus.

SIGNIFICANCE AND IMPACT OF THE STUDY

The investigation provided an understanding of the genetic diversity and biocontrol efficiency of M. anisopliae lineage in agroecosystem. These data will serve as a resource in the future pest management strategies at a regional scale.