Prediction of insecticidal activity of Bacillus thuringiensis strains by polymerase chain reaction product profiles.
AUTOR(ES)
Carozzi, N B
RESUMO
A rapid analysis of Bacillus thuringiensis strains predictive of insecticidal activity was established by using polymerase chain reaction (PCR) technology. Primers specific to regions of high homology within genes encoding three major classes of B. thuringiensis crystal proteins were used to generate a PCR product profile characteristic of each insecticidal class. Predictions of insecticidal activity were made on the basis of the electrophoretic patterns of the PCR products. Included in the screen were PCR primers specific for cryI, cryIII, and cryIV genes, which are insecticidal for lepidopterans, coleopterans, and dipterans, respectively. Known B. thuringiensis strains as well as unidentified strains isolated from soil and insect cadavers were analyzed by PCR. Small amounts of crude sample lysates were assayed in a single PCR reaction containing 12 to 20 primers capable of distinguishing between the different insecticidal genes. Insecticidal activity predicted by the PCR screen was found to correspond with the insecticidal activity of insect bioassays. In addition to identifying strains with known insecticidal genes, the PCR screen can identify strains with altered electrophoretic patterns containing potentially novel genes.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=183927Documentos Relacionados
- Arbitrary primer polymerase chain reaction, a powerful method to identify Bacillus thuringiensis serovars and strains.
- Screening by polymerase chain reaction of Bacillus thuringiensis serotypes for the presence of cryV-like insecticidal protein genes and characterization of a cryV gene cloned from B. thuringiensis subsp. kurstaki.
- Diversity of Bacillus thuringiensis Strains from Latin America with Insecticidal Activity against Different Mosquito Species
- Construction of Novel Bacillus thuringiensis Strains with Different Insecticidal Activities by Transduction and Transformation
- Multiplex polymerase chain reaction for detection and differentiation of the microbial insecticide Bacillus thuringiensis.