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Life at the limits: capacities of isolated and cultured lichen symbionts to resist extreme environmental stresses.

J-P de Vera1, P Rettberg, S Ott

  • 1Institute of Botany, Heinrich-Heine-University, Universitätsstr.1, 40225, Düsseldorf, Germany. devera@uni-duesseldorf.de

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Summary

Lichens, a symbiosis of fungi and algae, show enhanced survival in extreme conditions. This study found that Xanthoria elegans symbionts are resilient, suggesting their potential for exobiology research.

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Area of Science:

  • Astrobiology
  • Symbiotic biology
  • Environmental science

Background:

  • Lichens are symbiotic organisms comprising a mycobiont (fungus) and a photobiont (alga or cyanobacterium).
  • This symbiosis allows colonization of extreme environments unsuitable for individual symbionts.
  • The lichen Xanthoria elegans, known for its resilience, was chosen for space simulation studies.

Purpose of the Study:

  • To investigate the survival capacity of isolated symbionts from Xanthoria elegans under simulated space conditions.
  • To test the hypothesis that the symbiotic state enhances stress resistance compared to isolated symbionts.
  • To evaluate the potential of X. elegans as a model organism in exobiological research.

Main Methods:

  • Isolated mycobiont and photobiont cultures of Xanthoria elegans were subjected to simulated space conditions.
  • Exposure included various doses of ultraviolet (UV) radiation and vacuum.
  • Symbiont vitality was assessed using LIVE/DEAD staining and Confocal Laser Scanning Microscopy.
  • Post-exposure growth capacity on different media was analyzed.

Main Results:

  • Isolated symbionts demonstrated varying degrees of survival under UV and vacuum exposure.
  • Vitality tests indicated significant stress responses in the separated symbionts.
  • Growth capacity analysis revealed reduced resilience in isolated symbionts compared to their symbiotic state.
  • Data support the hypothesis that the symbiotic association confers enhanced stress tolerance.

Conclusions:

  • The symbiotic state significantly enhances the ability of myco- and photobionts to withstand extreme environmental conditions, including simulated space environments.
  • Xanthoria elegans symbionts exhibit remarkable resilience, particularly when in their symbiotic partnership.
  • Xanthoria elegans is a promising candidate for use as a model organism in exobiology and astrobiology studies.