Mutation frequency of Dictyostelium discoideum spores exposed to the space environment.

DOI Web Site PubMed 被引用文献12件 参考文献30件
  • Takahashi Akihisa
    Department of Biology, Nara Medical University, Kashihara, Nara 634,
  • Ohnishi Ken
    Department of Biology, Nara Medical University, Kashihara, Nara 634,
  • Fukui Mitsuyo
    Space Experiment Department, National Space Development Agency of Japan, Tsukuba, Ibaraki 305
  • Nakano Tamotsu
    Space Experiment Department, National Space Development Agency of Japan, Tsukuba, Ibaraki 305
  • Yamaguchi Katsumi
    Frontiers Joint Research Program Department, Japan Space Utilization Promotion Center, Nishiwaseda, Shinjuku-ku, Tokyo 169, Japan
  • Nagaoka Shunji
    Space Experiment Department, National Space Development Agency of Japan, Tsukuba, Ibaraki 305
  • Ohnishi Takeo
    Department of Biology, Nara Medical University, Kashihara, Nara 634,

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  • Mutation frequency of Dictyostelium dis

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Two strains of cellular slime mold Dictyostelium discoideum, a radiosensitive mutant and the parental wild-type strain, were used to investigate the effects of cosmic radiation on viability and mutation frequency at the spore stage for about 9 days in Space Shuttle of NASA. We measured little effect of space environment on viability and cell growth in the both strains as compared to ground controls. The mutation frequency of the flown spores were similar to that of ground control. These results suggest that there could be no effect of cosmic radiation, containing high linear energy transfer radiation at about 0.9 mSv/day as detected by real-time radiation monitoring device on the induction of mutation at the spore stage.

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