Pacelli Claudia, Selbmann Laura, Moeller Ralf, Zucconi Laura, Fujimori Akira, Onofri Silvano
Department of Ecological and Biological Sciences, University of Tuscia, Viterbo, Italy.
German Aerospace Center, Institute of Aerospace Medicine, Radiation Biology Department, Space Microbiology Research Group, Cologne, Germany.
Front Microbiol. 2017 Oct 17;8:2002. doi: 10.3389/fmicb.2017.02002. eCollection 2017.
Space represents an extremely harmful environment for life and survival of terrestrial organisms. In the last decades, a considerable deal of attention was paid to characterize the effects of spaceflight relevant radiation on various model organisms. The aim of this study was to test the survival capacity of the cryptoendolithic black fungus CCFEE 515 to space relevant radiation, to outline its endurance to space conditions. In the frame of an international radiation campaign, dried fungal colonies were irradiated with accelerated Helium ion (150 MeV/n, LET 2.2 keV/μm), up to a final dose of 1,000 Gy, as one of the space-relevant ionizing radiation. Results showed that the fungus maintained high survival and metabolic activity with no detectable DNA and ultrastructural damage, even after the highest dose irradiation. These data give clues on the resistance of life toward space ionizing radiation in general and on the resistance and responses of eukaryotic cells in particular.
太空对陆地生物的生命和生存而言是一个极其恶劣的环境。在过去几十年里，人们相当关注太空飞行相关辐射对各种模式生物的影响。本研究的目的是测试隐生内生黑真菌CCFEE 515对太空相关辐射的生存能力，概述其对太空条件的耐受性。在一次国际辐射实验中，作为与太空相关的电离辐射之一，干燥的真菌菌落被加速氦离子（150 MeV/n，线性能量传递2.2 keV/μm）照射，最终剂量达到1000 Gy。结果表明，即使在最高剂量照射后，该真菌仍保持高存活率和代谢活性，且未检测到DNA和超微结构损伤。这些数据总体上揭示了生命对太空电离辐射的抗性，尤其是真核细胞的抗性和反应。
