1. 南極の形態発現に異常なる多様性を持つ微生物(平成8年度第42回低温生物工学会研究報告)
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In Japan the late Dr. Hiroshi Iizuka is a pioneer in the field of the investigation of Antarctic microorganisms. We have reported on the diversity and originality of Antarctic microbial resources, for examples, yeasts and bacteria. At present time, I report that a microorganism from Antarctica has an abnormal diversity of morphological expression, and propose a hypothesis on the origin and evolution of life, and moreover, point out the importance of the symbiosis, diversity and environment of organisms. Microorganisms were isolated from the lake water samples of the Lake Vanda, Antarctica. These water samples were presented by Dr. Genki Matsumoto. The single colony isolations were done four times. The nuclei of cells were stained with DAPI (4', 6-diamidino-2-phenylindole), a fluorochrome specific for DNA, and were observed by a fluorescence microscope (Olympus BHS-RFK). The strain were cultured on Yeast-Malt slant or plate agar medium. The microorganisms (the J strain) grew even at 4℃ under aerobically or anaerobically. When the J strain grew at 20℃ on Yeast-Malt plate or slant agar for 7 days, the abnormal morphological diversity of cells was observed. The J strain showed various sizes and shapes of cells, for examples, spherical, triangle, irregular and filamentous and so on. The J strain had the diversity of the growth pattern, and also had the multi-cells and big structured cells. The cells of the J strain were different clearly from the the cells existing in the present time. The cells of the J strain had prokaryotic nuclei and eukaryotic nuclei according to observation of the nuclei of cells with fluorescence microscopy (DAPI stain). Moreover, the J strain had the diversity of the number and shape of nuclei in cells. From these results, it was concluded that the J strain had no ability of self-reproduction. I propose the following hypothesis. There may be remained the primitive environment on the origin of life in Antarctica. The pattern of start growth is not the pattern of self-reproduction, but caostic non self-reproduction. I speculate that an organism may have not been able to adapt to the environment but to only specialize to the one, and that the specialization to the environment is the same with the restriction to the one. Accordingly, it is concluded that in the existence of organisms the harmonical diversity of organisms is very important, and also the organism should have the diversity and originality.
- 低温生物工学会の論文
- 1996-12-30
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- 1. 南極の形態発現に異常なる多様性を持つ微生物(平成8年度第42回低温生物工学会研究報告)
- 南極の微生物学的研究(2) パンダ湖の好冷発酵性酵母