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Effect of Elicitors and Precursors on Azadirachtin Production in Hairy Root Culture of Azadirachta indica

Abstract

The present study involved strategies for enhancement in in vitro azadirachtin (commercially used biopesticide) production by hairy root cultivation of Azadirachta indica. Improvement in the azadirachtin production via triggering its biosynthetic pathway in plant cells was carried out by the exogenous addition of precursors and elicitors in the growth medium. Among the different abiotic stress inducers (Ag+, Hg+2, Co+2, Cu+2) and signal molecules (methyl jasmonate and salicylic acid) tested, salicylic acid at 15 mg l−1 of concentration was found to enhance the azadirachtin yield in the hairy roots to the maximum (up to 4.95 mg g−1). Similarly, among the different biotic elicitors tested (filter-sterilized fungal culture filtrates of Phoma herbarium, Alternaria alternata, Myrothecium sp., Fusarium solani, Curvularia lunata, and Sclerotium rolfsii; yeast extract; and yeast extract carbohydrate fraction), addition of filter-sterilized fungal culture filtrate of C. lunata (1 % v/v) resulted in maximum azadirachtin yield enhancement in hairy root biomass (up to 7.1 mg g−1) with respect to the control (3.3 mg g−1). Among all the biosynthetic precursors studied (sodium acetate, cholesterol, squalene, isopentynyl pyrophosphate, mavalonic acid lactone, and geranyl pyrophosphate), the overall azadirachtin production (70.42 mg l−1 in 25 days) was found to be the highest with cholesterol (50 mg l−1) addition as an indirect precursor in the medium.

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Acknowledgments

The financial support by Department of Biotechnology, Ministry of Science and Technology, New Delhi (India) for the execution of the above research is gratefully acknowledged.

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Correspondence to A. K. Srivastava.

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Srivastava, S., Srivastava, A.K. Effect of Elicitors and Precursors on Azadirachtin Production in Hairy Root Culture of Azadirachta indica . Appl Biochem Biotechnol 172, 2286–2297 (2014). https://doi.org/10.1007/s12010-013-0664-6

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Keywords

  • Azadirachta indica
  • Hairy roots
  • Azadirachtin
  • Yield
  • Elicitors
  • Precursors