Abstract
Main conclusion
Xanthoria parietina survivability in Mars-like conditions was supported by water-lysis efficiency recovery and antioxidant content balancing with ROS production after 30 days of exposure.
Abstract
Xanthoria parietina (L.) Th. Fr. is a widespread lichen showing tolerance against air pollutants and UV-radiation. It has been tested under space-like and Mars-like conditions resulting in high recovery performances. Hereby, we aim to assess the mechanisms at the basis of the thalli resilience against multiple space stress factors. Living thalli of X. parietina were exposed to simulated Martian atmospheric conditions (Dark Mars) and UV radiation (Full Mars). Then, we monitored as vitality indicator the photosynthetic efficiency, assessed by in vivo chlorophyll emission fluorescence measurements (FM; FV/F0). The physiological defense was evaluated by analyzing the thalli antioxidant capacity. The drop of FM and FV/F0 immediately after the exposure indicated a reduction of photosynthesis. After 24 h from exposure, photosynthetic efficiency began to recover suggesting the occurrence of protective mechanisms. Antioxidant concentrations were higher during the exposure, only decreasing after 30 days. The recovery of photosynthetic efficiency in both treatments suggested a strong resilience by the photosynthetic apparatus against combined space stress factors, likely due to the boosted antioxidants at the beginning and their depletion at the end of the exposure. The overall results indicated that the production of antioxidants, along with the occurrence of photoprotection mechanisms, guarantee X. parietina survivability in Mars-like environment.



Data availability
Data is available under reasonable request to the corresponding author.
Abbreviations
- DM:
-
Dark Mars condition
- FM:
-
Full Mars condition
- ECd/w:
-
Dried/wetted External Controls
- FO/M :
-
Basal/maximum fluorescence of dark-adapted samples
- FV/FO :
-
Maximum water-lysis efficiency
- FV/FM :
-
Maximum quantum yield of dark-adapted samples
- OEC:
-
Oxygen evolving complex
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Acknowledgements
C. L. and JR. B. acknowledge ASI/INAF 2023-3-HH.0 agreement. G. P. acknowledges support by Centre National d’Études Spatiales (CNES). M. B. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG—German Research Foundation), Grant 426601242, project RaBioFAM.
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Contributions listed according to authorship credits. CL: conceptualization, experimental design, specimens retrieving, data retrieving (performing all the analyses/measurements), data analysis, investigation, data interpretation, writing (original draft, review and editing). CA: conceptualization, experimental design, investigation, data interpretation, writing (review and editing). EV: data retrieving, investigation, data interpretation, writing (review and editing). EB: data interpretation, investigation, writing (review and editing). GP: writing (review and editing). GA: contribution to IR spectroscopy measurements. RB: writing (review and editing). JRB: writing (review and editing). SG: responsible for Mars Simulation Facility-Laboratory. JH: responsible for IR spectroscopy laboratory. SL: writing (review and editing). AL: responsible for Mars Simulation Facility-Laboratory. AM: responsible for IR spectroscopy laboratory. AP: writing (review and editing). J-PV data interpretation, investigation, writing (review and editing). MB: data interpretation, investigation, writing (review and editing). All authors read, edited and approved the final manuscript.
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Lorenz, C., Arena, C., Vitale, E. et al. Resilience of Xanthoria parietina under Mars-like conditions: photosynthesis and oxidative stress response. Planta 259, 25 (2024). https://doi.org/10.1007/s00425-023-04290-1
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DOI: https://doi.org/10.1007/s00425-023-04290-1