Mode of Action of Bacillus thuringiensis δ-Endotoxin : Effect on Galleria mellonella (Lepidoptera : Pyralidae)

概要

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The general pathology of Galleria mellonella induced by Bacillus thuringiensis δ-endotoxin was studied in terms of symptoms, relative roles of crystals and spores, hemolymph chemistry and the associated histopathology of the midgut. Bioassay using pure crystals and spores clearly demonstrated that the primary cause of death of Galleria larvae was the crystals and the presence of spores was only supplemental. Four hours after a single administration of crystals, changes appearing in the columnar cells of midgut epithelium were very similar to those observed in completely paralyzed Bombyx mori; cells swelled losing their microvilli, burst or sloughed off into the lumen. Changes appearing in the goblet cells were different from those observed in Bombyx mori; mitochodria came out from cytoplasmic projections which diminished in number in some cells. When cells sloughed off from the basement lamina, the projections were totally deformed. Mitosis and development of new columnar and goblet cells to replace the broken cells were more frequently observed in the regenerative cell-masses (nidi) than in those of normal epithelium. Although blood pH scarcely changed, the K+ level rose up to 1.3 times. These results led to the conclusion that the reaction of G. mellonella to serotype VII is not that of a Type III host species.
日本応用動物昆虫学会の論文
1981-05-25