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Silencing of an aphid carboxylesterase gene by use of plant-mediated RNAi impairs Sitobion avenae tolerance of Phoxim insecticides

Abstract

RNA interference (RNAi) describes the ability of double-stranded RNA (dsRNA) to inhibit homologous gene expression at the RNA level. Its specificity is sequence-based and depends on the sequence of one strand of the dsRNA corresponding to part or all of a specific gene transcript. In this study we adopted plant-mediated RNAi technology that targets Sitobion avenae (S. avenae) to enable gene silencing in the aphid and to minimize handling of the insects during experiments. S. avenae was selected for this study because it causes serious economic losses to wheat throughout the world. The carboxylesterase (CbE E4) gene in S. avenae was homologously cloned, which increased synthesis of a protein known to be critical to the resistance (tolerance) this species has developed to a wide range of pesticides. A plant RNAi vector was constructed, and transgenic Triticum aesticum (dsCbE1-5 and dsCbE2-2 lines) expressing CbE E4 dsRNA were developed. S. avenae were fed on dsCbE1-5 and dsCbE2-2 lines stably producing the CbE E4 dsRNA. CbE E4 gene expression in S. avenae was reduced by up to 30–60 %. The number of aphids raised on dsCbE1-5 and dsCbE2-2 was lower than the number raised on non-transgenic plants. A solution of CbE E4 enzyme from S. avenae fed on dsCbE1-5 and dsCbE2-2 plants hydrolyzed only up to 20–30 % Phoxim solution within 40 min whereas a solution of the enzyme from CbE E4 fed on control plants hydrolyzed 60 % of Phoxim solution within 40 min. CbE E4 gene silencing was achieved by our wheat-mediated RNAi approach. This plant-mediated RNAi approach for addressing degradation-based pesticide resistance mechanisms in aphids and may prove useful in pest management for diverse agro-ecosystems.

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Abbreviations

CbE E4 gene:

Carboxylesterase gene

RNAi:

RNA interference

PCR:

Polymerase chain reaction

qRT-PCR:

Quantitative real-time PCR

S. avenae :

Sitobion avenae (Fabricus)

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Acknowledgments

This research was financially supported by the grants from the Key Project of National Plant Transgenic Genes of China (2008ZX08002-001, 20011ZX08002-001).

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Correspondence to Rongqi Liang.

Additional information

Lanjie Xu and Xiaoliang Duan contributed equally to this work.

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Xu, L., Duan, X., Lv, Y. et al. Silencing of an aphid carboxylesterase gene by use of plant-mediated RNAi impairs Sitobion avenae tolerance of Phoxim insecticides. Transgenic Res 23, 389–396 (2014). https://doi.org/10.1007/s11248-013-9765-9

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Keywords

  • Common wheat
  • Sitobion avenae
  • Carboxylesterase gene
  • RNAi
  • Pesticide tolerance