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Main Title: Provision of water by halite deliquescence for Nostoc commune biofilms under Mars relevant surface conditions
Author(s): Jänchen, Jochen
Feyh, Nina
Szewzyk, Ulrich
Vera, Jean-Pierre Paul de
Type: Article
Language Code: en
Abstract: Motivated by findings of new mineral related water sources for organisms under extremely dry conditions on Earth we studied in an interdisciplinary approach the water sorption behaviour of halite, soil component and terrestrial Nostoc commune biofilm under Mars relevant environmental conditions. Physicochemical methods served for the determination of water sorption equilibrium data and survival of heterotrophic bacteria in biofilm samples with different water contents was assured by recultivation. Deliquescence of halite provides liquid water at temperatures <273 K and may serve as water source on Mars during themorning stabilized by the CO2 atmosphere for a few hours. The protecting biofilmof N. commune is rather hygroscopic and tends to store water at lower humidity values. Survival tests showed that a large proportion of the Alphaproteobacteria dominated microbiota associated to N. commune is very desiccation tolerant and water uptake from saturated NaCl solutions (either by direct uptake of brine or adsorption of humidity) did not enhance recultivability in long-time desiccated samples. Still, a minor part can grow under highly saline conditions.However, the salinity level, although unfavourable for the host organism,might be for parts of the heterotrophic microbiota no serious hindrance for growing in salty Mars-like environments.
Issue Date: 2015
Date Available: 23-Nov-2017
DDC Class: 570 Biowissenschaften; Biologie
Subject(s): geochemistry
Nostoc commune
water sorption
Sponsor/Funder: BMWi, 50WB1151, Untersuchungen zum Überleben und zur Aktivität von Eisenbakterien unter Mars-ähnlichen Bedingungen auf der ISS und im Labor
Journal Title: International journal of astrobiology
Publisher: Cambridge University Press
Publisher Place: Cambridge
Volume: 15
Issue: 2
Publisher DOI: 10.1017/s147355041500018x
Page Start: 107
Page End: 118
EISSN: 1475-3006
ISSN: 1473-5504
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:FG Umweltmikrobiologie » Publications

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