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Molecular approaches towards development of novel Bacillus thuringiensis biopesticides

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Abstract

Bacillus thuringiensis (Bt) has been used for control of lepidopteran, dipteran and coleopteran insects for over three decades. Novel Bt strains harbouring new types of insecticidal genes are being discovered worldwide. Recombinant strains with enhanced toxicity and broadened insecticidal spectrum have been constructed. To increase the field persistence of insecticidal crystal proteins (ICPs), alternative modes of their delivery in Pseudomonas sp. and endophytes have been developed. ICPs have been modified by site-directed mutagenesis to improve their insecticidal efficacy. Higher yields of ICPs have been achieved by use of strong expression promoters and other regulatory elements. Gene-disabling of the sporulation-specific protease has led to yield enhancement of ICPs. Interestingly, Bt toxins have been found to act synergistically with some other pesticidal agents. Optimization of fermentation conditions is an essential requirement for cost-effective commercial production of Bt biopesticides. The environmental impact of deployment of genetically engineered biopesticides has been assessed. Recombinant Bt strains that do not carry any non-Bt DNA, endophytes, encapsulation in killed bacteria (such as Pseudomonas) and asporogenous Bt strains are ecologically safe approaches. Efficient resistance management strategies require judicious use of Bt transgenic plants in conjunction with refugia and Bt biopesticides in an Integrated Pest Management (IPM) program.

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  1. National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India

    Sarvjeet Kaur

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Kaur, S. Molecular approaches towards development of novel Bacillus thuringiensis biopesticides. World Journal of Microbiology and Biotechnology 16, 781–793 (2000). https://doi.org/10.1023/A:1008931207374

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