Abstract
A trypsin inhibitor from Cocculus hirsutus, commonly known as “Farid Buti” has been demonstrated to exhibit insecticidal, fungicidal, as well as nematocidal activity. The ChTI (Cocculus hirsutus Trypsin Inhibitor) gene was designed in silico and synthesized by PCR-based gene synthesis and cloned in the plant expression vector pBI121, with kanamycin, as the selectable marker. Agrobacterium strain LBA4404 was transformed with pBI121:ChTI vector for plant transformation. For develo** insect-tolerant chickpea, Agrobacterium-mediated transformation of ChTI gene was performed in cultivar P-362. Twenty-day-old cotyledonary node (CN) explants were used for sonication-assisted Agrobacterium-mediated transformation. Three cycles of increasing concentrations of kanamycin were used for the selection of transformed shoots. In vitro grown transgenic chickpea shoots were grafted on decapitated stock of chickpea seedlings. After 45–50 days of acclimatization and hardening, pod development and its maturation occurred. After screening by PCR, seven transgenic events were confirmed to be positive by Southern blot hybridization analysis, showing 1–4 copies of the transgene. The quantitative expression of the ChTI gene by qRT-PCR analysis showed up to 12–17-fold change in the T1 progeny. Immunoblot analysis revealed the expression of 31 kDa and 15 kDa ChTI protein in E.coli and transgenic plants respectively. Trypsin activity assay was performed in the T1 generation and higher anti-trypsin activity was recorded. Insect tolerance against Helicoverpa armigera and Spodoptera litura were estimated by insect bioassay, wherein an overall mortality of 60–80% and weight loss (30–60% and 40–60% for Spodoptera litura and Helicoverpa armigera respectively) have been recorded in the plants of T1 generation.
Key Message
Expression of Cocculus hirsutus trypsin inhibitor (ChTI) gene in chickpea by Agrobacterium-mediated transformation, restricted the growth as well as the survival of two Lepidopteran insect pests Helicoverpa armigera and Spodoptera litura.
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Change history
22 March 2021
A Correction to this paper has been published: https://doi.org/10.1007/s11240-021-02054-x
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Acknowledgements
The authors are grateful to the Director, CSIR-NBRI, Lucknow, for infrastructural support. The authors are grateful for fellowships to UGC, New Delhi (AP, SK), CSIR, New Delhi (RY, AK, PS), and DST (AY), New Delhi. The research work was carried out under the CSIR-NBRI In-house project OLP104. NBRI manuscript no. CSIR-NBRI_MS/2021/02/06.
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Conceptualization: AP, RY & IS, Formal analysis: AP, AK, RY, Funding acquisition: IS, Investigation: AP, RY, AK, SK, PS, AY, Methodology: AP & RY, Project administration: IS, Resources: IS, Supervision: IS, Validation: AP, Writing - original draft: AP, Writing - review & editing: IS and AP.
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Communicated by Sergio J. Ochatt.
The original version of this article has been revised: The following missing sections have been included: Acknowledgements, Author contributions, and Declaration.
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Pandey, A., Yadav, R., Kumar, S. et al. Expression of the entomotoxic Cocculus hirsutus trypsin inhibitor (ChTI) gene in transgenic chickpea enhances its underlying resistance against the infestation of Helicoverpa armigera and Spodoptera litura. Plant Cell Tiss Organ Cult 146, 41–56 (2021). https://doi.org/10.1007/s11240-021-02041-2
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DOI: https://doi.org/10.1007/s11240-021-02041-2