characterization of lepidopteran-specific cry1 and cry2 gene harbouring native bacillus thuringiensis isolates toxic against helicoverpa armigera
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2017
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Abstract
Bacillus thuringiensis (Bt) based biopesticides are feasible alternatives to chemical pesticides. Here, we present the distribution of lepidopteran-specific cry1 and cry2 genes in native B. thuringiensis. Forty four out of 86 colonies were found to harbour crystals by phase contrast microscopy exhibiting a Bt index of 0.51. PCR analysis resulted in the amplification of cry1 in 24 and cry2 in 14 isolates. Twelve of the isolates showed presence of both cry1 and cry2, while 18 isolates did not show presence of either of the genes. Toxicity screening using spore-crystal mixtures against 2nd instar larvae of Helicoverpa armigera revealed that the isolates (50%) were either mildly toxic or not toxic (36.36%), and only 13.63% were toxic. The results are interesting, particularly so because the same isolates were previously reported to contain lepidopteran specific vip3A genes also, hence can complement the toxicity of the isolates harbouring vip3A genes.
| Reference Key |
lone2017biotechnologycharacterization
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|---|---|
| Authors | ;Showkat Ahmad Lone;Abdul Malik;Jasdeep Chatrath Padaria |
| Journal | PLoS genetics |
| Year | 2017 |
| DOI |
10.1016/j.btre.2017.05.001
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