Potential survival of the lichen Caloplaca flavovirescens under high helium-beam doses

K. Miki, S. Kawashima, Y. Takahashi, S. Yonemura

研究成果: Article査読

抄録

Testing the limits of survivability in space is the primary focus in astrobiological research. Although a number of previous studies have examined terrestrial life survival in an extraterrestrial environment, only a few have investigated how life systems respond to high doses of alpha cosmic ray, the main component of cosmic rays. We used respiration and photosynthetic rates as indicators of the vital signs of the lichen Caloplaca flavovirescens, which is a symbiotic life form including fungi and algae. Our experiment demonstrated that the photosynthetic rate decreased with increased helium-beam doses, whereas the respiration rate was relatively unaffected. Specifically, under a helium-beam dose greater than 10 Gy, the respiration rate remained nearly constant regardless of further increases in the radiation rate. Our results indicate that the different metabolic systems of terrestrial life forms might exhibit different survival characteristics when they are in space.

本文言語English
ページ(範囲)449-454
ページ数6
ジャーナルRadiation and Environmental Biophysics
58
3
DOI
出版ステータスPublished - 2019 8月 1
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • 放射線
  • 環境科学一般

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