Characterization of a highly pathogenic Bacillus thuringiensis strain isolated from common cockchafer, Melolontha melolontha.
A bacterial isolate (Mm2) of Melolontha melolontha was identified and characterized. Based on various morphological, physiological, biochemical and molecular characteristics, it was identified as Bacillus thuringiensis subsp. tenebrionis. This isolate was compared to the reference strains by electron microscopy, SDS-PAGE analysis, plasmid pattern, cry gene content and insecticidal activity. Cells of the isolate harbored flat square inclusions containing a protein component of approximately equal to65 kDa. After trypsin digestion of solubilized crystals, SDS-PAGE resolved a unique proteinase-resistant peptide of approximately equal to 50 kDa. Plasmid pattern showed similar bands to those of the reference strain, PCR analysis showed that the isolate has cry3 gene. Toxicity tests (against 5 coleopteran species) showed 80 % insecticidal activity against the larvae of M. melolontha. The isolate Mm2 may be valuable as biological control agent for M. melolontha and other coleopteran insects.
Kati
H
H
Department of Biology, Faculty ofArts and Sciences, Giresun University, 28049 Giresun, Turkey. hkati@ktu.edu.tr
Sezen
K
K
Demirbağ
Z
Z
D000818:Animals; D001413:Bacillus thuringiensis / Q000145:classification / Q000302:isolation & purification / Q000502:physiology*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D001427:Bacterial Toxins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D001517:Coleoptera / Q000382:microbiology*; D004731:Endotoxins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D005798:Genes, Bacterial; D006460:Hemolysin Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D002479:Inclusion Bodies / Q000648:ultrastructure; D008970:Molecular Weight; D010572:Pest Control, Biological; D013045:Species Specificity
D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis