Desert Cyanobacteria Under Non-Earth Conditions: Implications For Astrobiology And Sustainable Life Support

The astonishing capability of life to adapt to extreme conditions provides a new perspective on what habitable means.

Desert cyanobacteria of the genus Chroococcidiopsis have been investigated for survival potential under laboratory simulations of space and planetary conditions as well as under real space conditions or Mars conditions simulated in LEO. When exposure conditions did not exceed repair capabilities, insights were gained on constraints that life can withstand. When accumulated damage exceeded repair potential, biomarker detectability contributed to the search of life beyond Earth.

Results of the ESA BIOMEX and BOSS space missions performed outside the ISS showed that ultraviolet radiation greatly affects cellular survival and biomarkers stability. On the contrary, ionizing radiation does not significantly impair biomarker detectability in dried cells as revealed by Raman spectroscopy and fluorescence immunoassay. The capability of repairing upon retrieval back to Earth and rehydration, the DNA damage accumulated during 1.5-year exposure in LEO has implications for future cyanobacterial-based technologies.

In this context, the effect of microgravity on DNA repair capability will be investigated with the ASI BIORIDER experiment to be performed in the maiden flight of the ESA Space Rider. During the ASI project Life in Space the survival potential of dried Chroococcidiopsis under laboratory-planetary simulations was investigated, yielding new insight into endurance under salty-ice conditions simulating icy worlds.

The capability of desert strains to harvest near-infrared is under investigation in the context of the ASI ASTERIA project that holds implications for oxygenic photosynthesis on exoplanets. The gathered knowledge will contribute to perform new experimentations and advance the scientific utilization of the space platforms that are under development or in advanced planning stage for experiments beyond LEO.

The endurance of desert cyanobacteria under space and Mars-like conditions and their capability to grow using resources available in situ on the Moon and Mars have bene investigated in the ASI ReBUS project and on-going results gathered in the Space It Up project will further contribute to fill the gaps in developing cyanobacterial-based life systems to support human settlements on the Moon and Mars.

Desert cyanobacteria under non-Earth conditions: Implications for astrobiology and sustainable life support, Acta Astronautica. x-mol.

Desert cyanobacteria under non-Earth conditions: Implications for astrobiology and sustainable life support, Acta Astronautica (open access)

astrobiology, extremophile, microbiology,