Survival of lichens and bacteria exposed to outer space conditions - Results of the Lithopanspermia experiments

Torre, Rosa de la; Sancho, Leopoldo G.; Horneck, Gerda; Rios, Asuncion de los; Wierzchos, Jacek; Olsson-Francis, Kalsen; Cockell, Charles S.; Rettberg, Petra; Berger, Thomas; Vera, Jean-Pierre P. de; Ott, Sieglinde; Martinez Frias, Jesus; Gonzalez-Melendi de Leon, Pablo; Mercedes Lucas, Maria; Reina, Manuel; Pintado, Ana y Demets, Rene (2010). Survival of lichens and bacteria exposed to outer space conditions - Results of the Lithopanspermia experiments. "Icarus", v. 208 (n. 2); pp. 735-748. ISSN 0019-1035. https://doi.org/10.1016/j.icarus.2010.03.010.

Descripción

Título: Survival of lichens and bacteria exposed to outer space conditions - Results of the Lithopanspermia experiments
Autor/es:
  • Torre, Rosa de la
  • Sancho, Leopoldo G.
  • Horneck, Gerda
  • Rios, Asuncion de los
  • Wierzchos, Jacek
  • Olsson-Francis, Kalsen
  • Cockell, Charles S.
  • Rettberg, Petra
  • Berger, Thomas
  • Vera, Jean-Pierre P. de
  • Ott, Sieglinde
  • Martinez Frias, Jesus
  • Gonzalez-Melendi de Leon, Pablo
  • Mercedes Lucas, Maria
  • Reina, Manuel
  • Pintado, Ana
  • Demets, Rene
Tipo de Documento: Artículo
Título de Revista/Publicación: Icarus
Fecha: Agosto 2010
Volumen: 208
Materias:
Palabras Clave Informales: Astrobiology; Exobiology; Meteorites; Solar radiation
Escuela: Centro de Investigación en Biotecnología y Genómica de Plantas (CBGP) (UPM)
Departamento: Biotecnologia [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

n the space experiments Lithopanspermia, experimental support was provided to the likelihood of the lithopanspermia concept that considers a viable transport of microorganisms between the terrestrial planets by means of meteorites. The rock colonising lichens Rhizocarpon geographicum and Xanthoria elegans, the vagrant lichen Aspicilia fruticulosa, and endolithic and endoevaporitic communities of cyanobacteria and bacteria with their natural rock substrate were exposed to space for 10 days onboard the Biopan facility of the European Space Agency (ESA). Biopan was closed during launch and re-entry. In addition, in the Stone facility, one sample of R. geographicum on its natural granitic substrate was attached at the outer surface of the re-entry capsule close to the stagnation point, only protected by a thin cover of glass textolite. Post-flight analysis, which included determination of the photosynthetic activity, LIVE/DEAD staining, and germination capacity of the ascospores, demonstrated that all three lichen were quite resistant to outer space conditions, which include the full spectrum of solar extraterrestrial electromagnetic radiation or selected wavelength ranges. This high resistance of the lichens to space appears to be due to their symbiotic nature and protection by their upper pigmented layer, the cortex. In contrast, the rock- or halite-inhabiting bacteria were severely damaged by the same exposure. After atmospheric re-entry, the granite of the Stone sample was transformed into a glassy, nearly homogenous material, with several friction striae. None of the lichen cells survived this re-entry process. The data suggest that lichens are suitable candidates for testing the concept of lithopanspermia, because they are extremely resistant to the harsh environment of outer space. The more critical event is the atmospheric re-entry after being captured by a planet. Experiments simulating the re-entry process of a microbe-carrying meteoroid did not show any survivors.

Más información

ID de Registro: 7093
Identificador DC: http://oa.upm.es/7093/
Identificador OAI: oai:oa.upm.es:7093
Identificador DOI: 10.1016/j.icarus.2010.03.010
URL Oficial: http://www.sciencedirect.com/science/journal/00191035
Depositado por: Memoria Investigacion
Depositado el: 24 May 2011 11:07
Ultima Modificación: 20 Abr 2016 16:12
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