KMID : 1094720190240040638
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Biotechnology and Bioprocess Engineering 2019 Volume.24 No. 4 p.638 ~ p.645
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Insect-resistant Mechanism of Recombinant Baculovirus AcMNPV-PK2-EGFP against Spodoptera exigua Larvae
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Wei Lili
Xu Chenggang Liang Aihua Fu Yuejun
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Abstract
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Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV) is a kind of potential biological insecticide. Ac-PK2 protein encoded by orf123 in AcMNPV genome can inhibit eIF2¥á family kinases to increase viral adaptation in vivo. In our previous study, it was found that recombinant AcMNPV-PK2-EGFP showed high virulence and anti-insect activity against Sf9 cells and Spodoptera exigua larvae. In this study, we investigated the function of Ac-PK2 protein in the insecticidal activity of AcMNPV and the anti-insect mechanism. AcMNPV-PK2-EGFP up-regulated the expression of Ac-pk2 gene in midgut and nerve cord in infected Spodoptera exigua larvae, compared with these in wild-type treatment group. Transcriptional level of BmK IT and detoxication related genes in epidermis, midgut and nerve cord was detected by quantitative PCR. Phenoloxidase activity assay showed that the insect¡¯s humoral immunity was affected by AcMNPV-PK2-EGFP in a time-effect relationship. Western blot analysis of P53 protein indicated the apoptotic level in the midgut tissue was higher in AcMNPV-BmK IT and AcMNPV-PK2-EGFP co-infeced Spodoptera exigua larvae than that in other treatment groups at 4 h and 8 h postinfection. These results provided a theoretical basis to study the application of AcMNPV-PK2-EGFP as a biological insecticide.
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KEYWORD
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Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV), baculovirus, PK2, biological insecticide, Spodoptera exigua
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