title: PCR-based method for the detection of cry genes in local isolates of Bacillus thuringiensis from Thailand.
abstract: A total of 134 isolates of Bacillus thuringiensis obtained from different geographical and ecological origins in Thailand were analyzed to determine the distribution and diversity of cry1, cry2 and cry9 genes encoding for Cry proteins toxic to lepidopteran insects. Strains containing cry1-type genes (109/134 or 81.3%) were found at the same frequency as strains harboring cry2 gene (108/134 or 80.6%) whereas only 50 strains contained cry9 gene (50/134 or 37.3%). Seventeen percent (23/134) of the B. thuringiensis isolates did not harbor any cry1, cry2 or cry9 genes. Among cry1 containing isolates, cry1A (49.3%), cry1B (50.0%), cry1G (48.5%), cry1I (49.3%), cry1J (35.1%) and cry1L (47.0%) were considered abundant. The cry2 gene was distributed with high frequency (>70%) in every region of the country. The study of cry gene combinations revealed 14 cry gene profiles.
authors.affiliation: Department of Science, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen, Nakorn Pathom 73140, Thailand. faasant@ku.ac.th
authors.forename: Anon
authors.initials: A
authors.lastname: Thammasittirong
authors.forename: Tipvadee
authors.initials: T
authors.lastname: Attathom
mesh_terms: D001413:Bacillus thuringiensis / Q000235:genetics*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics*; D017931:DNA Primers; D004731:Endotoxins / Q000235:genetics*; D005798:Genes, Bacterial; D006460:Hemolysin Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000379:methods; D013785:Thailand
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D017931:DNA Primers; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis