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- W1998833307 abstract "Larvae of the black cutworm, Agrotis ipsilon Hufnagel, were more susceptible to infection by A. ipsilon multiple nucleopolyhedrovirus (AgipMNPV: Baculoviridae) after feeding on Herculex I, a transgenic corn hybrid expressing the Bacillus thuringiensis (Bt)-derived toxin Cry1Fa2 compared to larvae fed on isoline corn. We investigated the physiological basis for increased susceptibility to virus infection following exposure to Herculex I by analyzing the midgut pH, gut protease activity and peritrophic matrix structure which are important factors for both Bt toxin action and baculovirus infection. No significant treatment differences were found in the pH of anterior midgut, central midgut or posterior midgut in larvae fed Herculex I or isoline diets. Analysis of soluble and membrane-associated gut proteinase activities from larvae fed Herculex I or isoline diets indicated that membrane-associated aminopeptidase activity and soluble chymotrypsin-like proteinase activity were significantly lower in Herculex I -fed larvae compared to isoline-fed larvae. The number and relative molecular masses of soluble chymotrypsin-like proteinases did not differ. Baculoviruses were not susceptible to in vitro degradation by bovine chymotrypsin, suggesting that chymotrypsin degradation of baculovirus occlusion-derived virus did not result in reduced infection of larvae fed on isoline diet. Scanning electron micrographs of the peritrophic matrices of Herculex I -fed larvae and isoline-fed larvae indicated that Herculex I did not result in damage to the peritrophic matrix that could facilitate subsequent baculovirus infection. Additional research is required to further delineate the physiological basis for enhanced baculovirus infection following exposure to sublethal doses of Bt toxins." @default.
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- W1998833307 date "2009-10-01" @default.
- W1998833307 modified "2023-09-27" @default.
- W1998833307 title "Toward the physiological basis for increased Agrotis ipsilon multiple nucleopolyhedrovirus infection following feeding of Agrotis ipsilon larvae on transgenic corn expressing Cry1Fa2" @default.
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- W1998833307 doi "https://doi.org/10.1016/j.jip.2009.07.012" @default.
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