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- W2005297685 abstract "The closely related entomophthoralean fungi Entomophaga aulicae and E. maimaiga are both host-specific pathogens of lepidopteran larvae. However, these fungi do not have the same host range. The first objective of this study was to compare the fate of E. aulicae in the nonpermissive host Lymantria dispar with the fate of the successful pathogen E. maimaiga over the same time period. In the hemolymph of L. dispar injected with E. maimaiga protoplasts, the number of hemocytes demonstrated a decreasing trend after the first day postinjection and hemocytes completely disappeared by day 5, with the majority of larvae dying in 5.6 +/- 0.1 days. In L. dispar larvae, E. maimaiga infections developed successfully, evidenced by increasing numbers of protoplasts and hyphal bodies prior to host mortality. In contrast, at day 5 hemocytes were readily visible in hemolymph of E. aulicae-injected larvae, but E. aulicae cells did not increase in numbers, although persisting in the hemolymph for at least 16 days postinjection. For both fungal species, when hemolymph samples from injected insects were introduced to culture media viable fungal cultures were always produced. Both E. aulicae and E. maimaiga occurred in hemolymph initially after injection as protoplasts. For E. maimaiga, after day 3, <50% of fungal cells were hyphal bodies until insect death when most cells regenerated cell walls. For E. aulicae, from day 2 equal numbers of fungal cells in the hemolymph occurred as protoplasts and hyphal bodies. To investigate the cause of fungistasis in E. aulicae-injected larvae, E. aulicae cell cultures exposed to partially purified protein fractions from hemolymph of larvae infected with either fungus displayed increased lysis and decreased viability at lower concentrations of protein fractions compared with E. maimaiga cell cultures. These studies demonstrate that E. aulicae does not increase in L. dispar hemolymph, although it persists and results suggest that proteinaceous factors induced within the hemolymph may limit the capacity of E. aulicae to develop successful infections." @default.
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- W2005297685 date "2001-11-01" @default.
- W2005297685 modified "2023-09-27" @default.
- W2005297685 title "Survival and Differential Development of Entomophaga maimaiga and Entomophaga aulicae (Zygomycetes: Entomophthorales) in Lymantria dispar Hemolymph" @default.
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- W2005297685 doi "https://doi.org/10.1006/jipa.2001.5069" @default.
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