ミドリゾウリムシ由来クロレラのアメーバ細胞質への感染とその宿主細胞の増殖に及ぼす影響

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  • ミドリゾウリムシ ユライ クロレラ ノ アメーバ サイボウシツ エ ノ カンセン ト ソノ シュクシュ サイボウ ノ ゾウショク ニ オヨボス エイキョウ
  • Infection of Chlorella from Paramecium bursaria into the Cytoplasm of Amoeba proteus and its Influence on the Host Cell Division

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type:P(論文)

Amoeba proteus was fed with a symbiotic Paramecium bursaria (G cell) harbouring Chlorella sp. The processes of food vacuole formation and infection of Chlorella into the cytoplasm of Amoeba proteus were observed under the light and the electron microscopes. The results showed that some large food vacuoles were formed by taking in an individual G cell and each of them gradually divided into several smaller food vacuoles. In these processes G cells were digested but Chlorella was not digested nor excreted. As a result each Chlorella cell remained wrapped in a membrane derived from the food vacuoles and the infection of Chlorella into the cytoplasm of Amoeba was established. These Chlorella cells were kept in Amoeba at least for a month. We also observed that Amoeba, when fed an aposymbiotic P. bursaria (W cell) with no Chlorella, formed some large food vacuoles. The large food vacuole did not undergo fission but gradually became smaller, with the cell being digested. In order to examine the influence of the infection of Chlorella on the proliferation of Amoeba, Amoeba with Chlorella (G Amoeba) and Amoeba without Chlorella (W Amoeba) were cultured in the dark and in two levels of illumination intensity and the proliferation of Amoeba was measured. The result showed that the proliferation of W Amoeba was inhibited when illumination was intensified but growth number of G Amoeba was constant to a certain level of illumination. This fact suggest that the infection of Chlorella gave a property of photoresistance to Amoeba.

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