Abstract
Key message
This study demonstrates multi-gene silencing approach for simultaneous silencing of several functional genes through a fusion gene strategy for protecting plants against root-knot nematode, Meloidogyne incognita.
The ability of root-knot nematode (RKN), Meloidogyne incognita, to cause extensive yield decline in a wide range of cultivated crops is well-documented. Due to the inadequacies of current management approaches, the alternatively employed contemporary RNA interference (RNAi)-based host-delivered gene silencing (HD-RNAi) strategy targeting different functional effectors/genes has shown substantial potential to combat RKNs. In this direction, we have explored the possibility of simultaneous silencing of four esophageal gland genes, six plant cell-wall modifying enzymes (PCWMEs) and a serine protease gene of M. incognita using the fusion approach. In vitro RNAi showed that combinatorial gene silencing is the most effective in affecting nematode behavior in terms of reduced attraction, penetration, development, and reproduction in tomato and adzuki beans. In addition, qRT-PCR analysis of M. incognita J2s soaked in fusion-dsRNA showed perturbed expression of all the genes comprising the fusion construct confirming successful dsRNA processing which is also supported by increased mRNA abundance of five key-RNAi pathway genes. In addition, hairpin RNA expressing constructs of multi-gene fusion cassettes were developed and used for generation of Nicotiana tabacum transgenic plants. The integration of gene constructs and expression of siRNAs in transgenic events were confirmed by Southern and Northern blot analyses. Besides, bio-efficacy analyses of transgenic events, conferred up to 87% reduction in M. incognita multiplication. Correspondingly, reduced transcript accumulation of the target genes in the M. incognita females extracted from transgenic events confirmed successful gene silencing.
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The data sets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank the Director and the Joint Director (Research), ICAR-Indian Agricultural Research Institute, New Delhi, India for extending support and facilities to complete the study.
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This work was supported by ICAR-Indian Agricultural Research Institute, New Delhi-110012 from the Institutional research and development fund.
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UR: conceptualization, supervision and fund acquisition. AH and PB: design the gene constructs. AH performed all the experiments. PKP: help in molecular characterization of the transgenics. DS, RK, MC and JY: assisted with in vitro studies and plant transformation. AH: nematode bioassays, data analysis and wrote the original draft of the manuscript. AH and UR: finalized the final draft of the manuscript. All authors read and approved the manuscript.
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Hada, A., Singh, D., Banakar, P. et al. Host-delivered RNAi-mediated silencing using fusion cassettes of different functional groups of genes precludes Meloidogyne incognita multiplication in Nicotiana tabacum. Plant Cell Rep 42, 29–43 (2023). https://doi.org/10.1007/s00299-022-02934-2
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DOI: https://doi.org/10.1007/s00299-022-02934-2