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- W2067702557 abstract "Aims: To investigate the distribution of chitinase in Bacillus thuringiensis strains, and the enhancing effects of the chitinase-producing B. thuringiensis strains on insecticidal toxicity of active B. thuringiensis strain against Spodoptera exigua larvae. Methods and Results: The chitinolytic activities of B.thuringiensis strains representing the 70 serotypes were investigated by the whitish opaque halo and the colorimetric method. Thirty-eight strains produced different levels of chitinase at pH 7·0, and so did 17 strains at pH 10·0. The strain T04A001 exhibited the highest production, reaching a specific activity of 355 U ml−1 in liquid medium. SDS-PAGE and Western blotting showed that the chitinase produced by some B. thuringiensis strains had a molecular weight of about 61 kDa. The bioassay results indicated that the chitinase-producing B. thuringiensis strains could enhance the insecticidal activity of B. thuringiensis strain DL5789 against S. exigua larvae, with an enhancing ratio of 2·35-fold. Conclusion: This study demonstrated that chitinase was widely produced in B. thuringiensis strains and some of the strains could enhance the toxicity of active B. thuringiensis strain. Significance and Impact of the Study: This is the first investigation devoted exclusively to analyse the distribution of chitinase in B. thuringiensis. It infers that the chitinase produced by B. thuringiensis might play a role in the activity of the biopesticide." @default.
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- W2067702557 date "2002-09-01" @default.
- W2067702557 modified "2023-10-17" @default.
- W2067702557 title "Chitinolytic activities in Bacillus thuringiensis and their synergistic effects on larvicidal activity" @default.
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- W2067702557 doi "https://doi.org/10.1046/j.1365-2672.2002.01693.x" @default.
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