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A novel tasi RNA-based micro RNA-induced gene silencing strategy to tackle multiple pests and pathogens in cotton (Gossypium hirsutum L.)

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Main conclusion

This study demonstrates the combinatorial management of multiple pests through a trans-acting siRNA (tasiRNA)-based micro RNA-induced gene silencing (MIGS) strategy. Transgenic cotton events demonstrated improved efficacy against cotton leaf curl disease, cotton leaf hopper and root-knot nematode.

Abstract

Cotton (Gossypium hirsutum L.), an important commercial crop grown worldwide is confronted by several pests and pathogens, thus reiterating interventions for their management. In this study, we report, the utility of a novel Arabidopsis miRNA173-directed trans-acting siRNA (tasiRNA)-based micro RNA-induced gene silencing (MIGS) strategy for the simultaneous management of cotton leaf curl disease (CLCuD), cotton leaf hopper (CLH; Amrasca biguttula biguttula) and root-knot nematode (RKN, Meloidogyne incognita). Cotton transgenics were developed with the MIGS construct targeting a total of 7 genes by an apical meristem-targeted in planta transformation strategy. Stable transgenics were selected using stringent selection pressure, molecular characterization and stress-specific bio-efficacy studies. We identified 8 superior events with 50–100% resistance against CLCuD, while reduction in the root-knot nematode multiplication factor in the range of 35–75% confirmed resistance to RKN. These transgenic cotton events were also detrimental to the growth and development of CLH, as only 43.3–62.5% of nymphs could survive. Based on the corroborating evidences obtained by all the bioefficacy analyses, 3 events viz., L-75-1, E-27-11, E-27-7 were found to be consistent in tackling the target pests. To the best of our knowledge, this report is the first of its kind demonstrating the possibility of combinatorial management of pests/diseases in cotton using MIGS approach. These identified events demonstrate immense utility of the strategy towards combinatorial stress management in cotton improvement programs.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank Dr. Subba Reddy Palli, University of Kentucky for kindly sharing cotton leaf hopper gene sequences of Sec23 and EcR. The authors also acknowledge and thank Mr. Manoj Kumar for the maintenance and management of transgenic plants in the net house.

Funding

This work was supported by the grant received from Biotechnology Industry Research Assistance Council (BIRAC) [No. BT/SBIRI-1238/SBIRI-24/14 BIPP].

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Correspondence to Uma Rao or Rohini Sreevathsa.

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All the authors declare that they have no competing interests to declare.

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This article does not contain any studies with animals performed by any of the authors.

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Communicated by Anastasios Melis.

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Karthik, K., Hada, A., Bajpai, A. et al. A novel tasi RNA-based micro RNA-induced gene silencing strategy to tackle multiple pests and pathogens in cotton (Gossypium hirsutum L.). Planta 257, 20 (2023). https://doi.org/10.1007/s00425-022-04055-2

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  • DOI: https://doi.org/10.1007/s00425-022-04055-2

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