Ohnishi T, Takahashi A, Okaichi K, Ohnishi K, Matsumoto H, Takahashi S, Yamanaka H, Nakano T, Nagaoka S
Department of Biology, Nara Medical University, Japan.
Biol Sci Space. 1997 Mar;11(1):29-34. doi: 10.2187/bss.11.29.
Two strains of cellular slime mold Dictyostelium discoideum, a radiation-sensitive mutant and the parental wild-type strain, were used to investigate the effects of microgravity and/or cosmic radiation on their morphology through the whole life span from spores to fruiting bodies for about 7 days in space shuttle of NASA. We found almost no effect of space environment on amoeba cell growth in both strains. It was also observed that almost the same number and shape of fruiting bodies in space compared to the control experiments on earth. These results suggest that there is little effect of microgravity and space radiation on germination, cell aggregation, cell differentiation and cell morphology in the cellular slime mold.
利用两种细胞黏菌盘基网柄菌（Dictyostelium discoideum）菌株，即一种辐射敏感突变体和其亲本野生型菌株，通过美国国家航空航天局（NASA）航天飞机在太空中约7天的时间，从孢子到子实体的整个生命周期来研究微重力和/或宇宙辐射对其形态的影响。我们发现太空环境对这两种菌株的变形虫细胞生长几乎没有影响。还观察到，与地球上的对照实验相比，太空中子实体的数量和形状几乎相同。这些结果表明，微重力和太空辐射对细胞黏菌的萌发、细胞聚集、细胞分化和细胞形态几乎没有影响。
