コケ類胞子と茎葉体の真空および窒素置換に対する耐性実験

We have investigated to know the limit where the life on the earth can be resistant against various kinds of the extreme environmental factor in the space. Spores and leaves of a moss may be extremely resistant against them, so we have chosen three kinds of moss, and investigated the effect of three kinds of extreme environmental factors: vacuum (1 x 10(exp -3) Pa), nitrogen-exchanged air (1 Pa), and ultrahigh pressure (7.5 GPa). Ratio of budding in the spores and leaves exposed to vacuum for two months was not different from that of the control groups not exposed to vacuum. Budding of the group exposed to nitrogen-exchanged air for one month did not show any difference from that of control groups. Furthermore, 20 percent of spores were resistant against ultrahigh pressure exposed for one week. These results indicate that spores and leaves of the moss have much stronger resistibility against extreme environmental factors that the 'tun' of Milnesium tardigradum we have studied up to now. Spores and leaves of the moss may be a very good material for the resistivity of the life on earth against extreme environmental conditions in space.

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