Abstract
RNA interference (RNAi)-mediated gene silencing was explored for the control of sap-sucking pest Bemisia tabaci, commonly known as whitefly. dsRNAs and siRNAs were synthesized from five different genes – actin ortholog, ADP/ATP translocase, α-tubulin, ribosomal protein L9 (RPL9) and V-ATPase A subunit. A simplified insect bioassay method was developed for the delivery of ds/siRNA through the oral route, and efficacy was evaluated. ds/siRNA caused 29–97% mortality after 6 days of feeding. Each insect ingested nearly 150 nl of insect diet per day, which contained a maximum of 6 ng of RNA. Knocking down the expression of RPL9 and V-ATPase A caused higher mortality with LC50 11.21 and 3.08 μg/ml, respectively, as compared to other genes. Semi-quantitative PCR of the treated insects showed significant decrease in the level of RPL9 and V-ATPase A transcripts. siRNAs were found stable in the insect diet for at least 7 days at the room temperature. Phloem-specific expression of dsRNAs of RPL9 and V-ATPase A in transgenic plants for the protection against whiteflies might be an interesting application of this technology.
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Abbreviations
- ASAL:
-
Allium sativum agglutinin
- DMRT:
-
Duncan’s multiple range test
- EST:
-
expressed sequence tag; RNAi, RNA interference
- RPL9:
-
ribosomal protein L9
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Acknowledgements
The authors are grateful to Council of Scientific and Industrial Research (CSIR), New Delhi, for the financial support. RT is grateful to Department of Science and Technology, New Delhi, for the JC Bose Fellowship. SKU is thankful to CSIR for the senior research fellowship.
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[Upadhyay SK Chandrashekar K, Thakur N, Verma PC, Borgio JF, Singh PK and Tuli R 2011 RNA interference for the control of whiteflies (Bemisia tabaci) by oral route. J. Biosci. 36 153–161] DOI 10.1007/s12038-011-9009-1
MS received 29 July 2010; accepted 16 December 2010, ePublication: 14 March 2011 and Corresponding editor: Man Mohan Johri
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Upadhyay, S.K., Chandrashekar, K., Thakur, N. et al. RNA interference for the control of whiteflies (Bemisia tabaci) by oral route. J Biosci 36, 153–161 (2011). https://doi.org/10.1007/s12038-011-9009-1
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DOI: https://doi.org/10.1007/s12038-011-9009-1