４種の微胞子虫の家蚕における経口感染経路

DOI 日本農学文献記事索引 Web Site 被引用文献2件

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  • Pathways of oral infection in the four Microsporideae in the silkworm, Bombyx mori.
  • 4シュ ノ ビホウシチュウ ノ カサン ニ オケル ケイコウ カンセン ケイロ

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Pathways of oral infection with four Microsporideae in the 2nd instar larvae of Bombyx mori were reinvestigated. 1) Spores of N. bombycis extruded their polar filaments in every area of the mid-gut lumen. Sporoplasms and intermediate forms between sporoplasm and schizont of N. bombycis were found in the cytoplasm of the mid-gut epithelium and the circular muscle of the middle part of the mid-gut 5 and 24 hours after spore ingestion. Tow days later colonies of schizonts appeared in the cytoplasm of the cells of the mid-gut epithlium, circular muscles, longitudinal muscles, and adjacent tissues of the mid-gut. 2) Sporoplasms of Nosema sp. M-11 were found in the cytoplasm of the mid-gut epithelium 6 hours after spore ingestion. Four days later, schizonts of M-11 proliferated in the mid-gut epithelium, muscle of the posterior area of the mid-gut, and their adjacent tissues. 3) Spores of Vairimorpha sp. M-12 germinated in every area of the mid-gut lumen and their sporoplasms were observed in the cytoplasm of the mid-gut epithelium and middle part of the mid-gut. Two days later, schizonts of M-12 were seen in the same tissues and sometimes in the adjacent tissues, 4) Spores of Pleistophora sp. extruded their polar filaments in every area of the mid-gut lumen. Based on these observations, the pathways of oral infection with these four Microsporideae were discussed.

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