Larvicidal activity of Bacillus thuringiensis subsp. israelensis in the dipteran Haematobia irritans.
AUTOR(ES)
Temeyer, K B
RESUMO
A strain of Bacillus thuringiensis subsp. israelensis was found to be larvicidal to horn flies, Haematobia irritans (L. [Diptera:Muscidae]). The toxic activity was particulate, appeared during sporulation, and could be prevented by the addition of streptomycin before sporulation. Density gradient centrifugation in Renografin was used to separate endospores, crystals, and low-density particulate matter (fraction 3) from sporulated preparations. Larvicidal activity was restricted to purified crystals and fraction 3, indicating that delta-endotoxin of B. thuringiensis subsp. israelensis was active against horn fly larvae. Purified crystals produced mortality during larval feeding stages, but not pupal stages. Fraction 3 produced significant mortality during both larval and pupal stages. The mortality data indicated the presence of at least two dipteran-active toxins.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=240024Documentos Relacionados
- Stability of the larvicidal activity of Bacillus thuringiensis subsp. israelensis: amino acid modification and denaturants.
- Mosquito larvicidal activity of Escherichia coli with combinations of genes from Bacillus thuringiensis subsp. israelensis.
- Activation Process of Dipteran-Specific Insecticidal Protein Produced by Bacillus thuringiensis subsp. israelensis
- Analysis of mosquito larvicidal potential exhibited by vegetative cells of Bacillus thuringiensis subsp. israelensis.
- Transcriptional regulation of Bacillus thuringiensis subsp. israelensis mosquito larvicidal crystal protein gene cryIVA.