Arid
DOI10.1089/ast.2010.0588
Whole Lichen Thalli Survive Exposure to Space Conditions: Results of Lithopanspermia Experiment with Aspicilia fruticulosa
Raggio, J.1; Pintado, A.1; Ascaso, C.2; De La Torre, R.3; De Los Rios, A.2; Wierzchos, J.2; Horneck, G.4; Sancho, L. G.1
通讯作者Raggio, J.
来源期刊ASTROBIOLOGY
ISSN1531-1074
EISSN1557-8070
出版年2011
卷号11期号:4页码:281-292
英文摘要

The Lithopanspermia space experiment was launched in 2007 with the European Biopan facility for a 10-day spaceflight on board a Russian Foton retrievable satellite. Lithopanspermia included for the first time the vagrant lichen species Aspicilia fruticulosa from Guadalajara steppic highlands (Central Spain), as well as other lichen species. During spaceflight, the samples were exposed to selected space conditions, that is, the space vacuum, cosmic radiation, and different spectral ranges of solar radiation (lambda >= 110, >= 200, >= 290, or >= 400 nm, respectively). After retrieval, the algal and fungal metabolic integrity of the samples were evaluated in terms of chlorophyll a fluorescence, ultrastructure, and CO2 exchange rates. Whereas the space vacuum and cosmic radiation did not impair the metabolic activity of the lichens, solar electromagnetic radiation, especially in the wavelength range between 100 and 200 nm, caused reduced chlorophyll a yield fluorescence; however, there was a complete recovery after 72 h of reactivation. All samples showed positive rates of net photosynthesis and dark respiration in the gas exchange experiment. Although the ultrastructure of all flight samples showed some probable stress-induced changes (such as the presence of electron-dense bodies in cytoplasmic vacuoles and between the chloroplast thylakoids in photobiont cells as well as in cytoplasmic vacuoles of the mycobiont cells), we concluded that A. fruticulosa was capable of repairing all space-induced damage. Due to size limitations within the Lithopanspermia hardware, the possibility for replication on the sun-exposed samples was limited, and these first results on the resistance of the lichen symbiosis A. fruticulosa to space conditions and, in particular, on the spectral effectiveness of solar extraterrestrial radiation must be considered preliminary. Further testing in space and under space-simulated conditions will be required. Results of this study indicate that the quest to discern the limits of lichen symbiosis resistance to extreme environmental conditions remains open.


英文关键词Astrobiology Lichens Panspermia Chlorophyll fluorescence CO2 exchange Ultrastructure
类型Article
语种英语
国家Spain ; Germany
收录类别SCI-E
WOS记录号WOS:000290783000002
WOS关键词BACILLUS-SUBTILIS SPORES ; SOIL CRUST ; CONTINENTAL ANTARCTICA ; BACTERIAL-SPORES ; WATER RELATIONS ; CENTRAL SPAIN ; CO2 EXCHANGE ; PHOTOSYNTHESIS ; ENVIRONMENT ; DESERT
WOS类目Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS研究方向Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/167190
作者单位1.Univ Complutense Madrid, Fac Farm, Dept Biol Vegetal 2, E-28040 Madrid, Spain;
2.MNCN CSIC, Madrid 28006, Spain;
3.INTA, Madrid, Spain;
4.Inst Luft & Raumfahrtmed, Deutsch Zentrum Luft & Raumfahrt, Cologne, Germany
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Raggio, J.,Pintado, A.,Ascaso, C.,et al. Whole Lichen Thalli Survive Exposure to Space Conditions: Results of Lithopanspermia Experiment with Aspicilia fruticulosa[J],2011,11(4):281-292.
APA Raggio, J..,Pintado, A..,Ascaso, C..,De La Torre, R..,De Los Rios, A..,...&Sancho, L. G..(2011).Whole Lichen Thalli Survive Exposure to Space Conditions: Results of Lithopanspermia Experiment with Aspicilia fruticulosa.ASTROBIOLOGY,11(4),281-292.
MLA Raggio, J.,et al."Whole Lichen Thalli Survive Exposure to Space Conditions: Results of Lithopanspermia Experiment with Aspicilia fruticulosa".ASTROBIOLOGY 11.4(2011):281-292.
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