Abstract
Globodera pallida, an obligate sedentary endoparasite, is a major economic pest that causes substantial potato yield losses. This research aimed to study the effects of gene silencing of three FMRFamide-like peptides (FLPs) genes to reduce G. pallida infestation on potato plants by using kaolinite nanoclay as a carrier to deliver dsRNAs via drenching. A dsRNA dosage of 2.0 mg/ml silenced flp-32c by 89.5%, flp-32p by 94.6%, and flp-2 by 94.3%. J2s incubated for 5 and 10 h showed no phenotypic changes. However, J2s of G. pallida efficiently uptake dsRNA of all targeted genes after 15 h of incubation. On the other hand, J2s that had been kept for 24 h had a rigid and straight appearance. Under fluorescence microscopy, all dsRNA-treated nematodes showed fluorescein isothiocyanate (FITC) signals in the mouth, nervous system, and digestive system. The untreated population of J2s did not show any FITC signals and was mobile as usual. The drenching of potato cultivar Kufri Jyoti with the dsRNA-kaolinite formulations induced deformation and premature death of J2s, compared with untreated J2s that entered J3 or J4 stages. This study validates that the nanocarrier-delivered RNAi system could be employed effectively to manage G. pallida infestations.
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Acknowledgements
The authors acknowledge ICAR-CPRI, Shimla for conducting the laboratory and glass house experiments.
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We acknowledge the financial help received from DST-SERB, New Delhi (Project code: ECR/2017/000402).
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AB, SuS, and EPV conceptualized and designed the study. SS and BrS contributed reagents and materials. AB, SuS, and BD performed experiments. BS, KCN, and PHM analyzed the data. AB and BD did literature research and drafted the manuscript. BD and NS revised the manuscript. The submitted version of the manuscript has been approved by all authors.
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Bairwa, A., Dipta, B., Siddappa, S. et al. Kaolinite nanoclay-shielded dsRNA drenching for management of Globodera pallida: An environmentally friendly pest management approach. Protoplasma (2024). https://doi.org/10.1007/s00709-024-01950-1
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DOI: https://doi.org/10.1007/s00709-024-01950-1