Lack of correlation of desiccation and radiation tolerance in microorganisms from diverse extreme environments tested under anoxic conditions

FEMS Microbiology Letters
Kristina Beblo-VranesevicPetra Rettberg

Abstract

Four facultative anaerobic and two obligate anaerobic bacteria were isolated from extreme environments (deep subsurface halite mine, sulfidic anoxic spring, mineral-rich river) in the frame MASE (Mars Analogues for Space Exploration) project. The isolates were investigated under anoxic conditions for their survivability after desiccation up to 6 months and their tolerance to ionizing radiation up to 3000 Gy. The results indicated that tolerances to both stresses are strain-specific features. Yersinia intermedia MASE-LG-1 showed a high desiccation tolerance but its radiation tolerance was very low. The most radiation-tolerant strains were Buttiauxella sp. MASE-IM-9 and Halanaerobium sp. MASE-BB-1. In both cases, cultivable cells were detectable after an exposure to 3 kGy of ionizing radiation, but cells only survived desiccation for 90 and 30 days, respectively. Although a correlation between desiccation and ionizing radiation resistance has been hypothesized for some aerobic microorganisms, our data showed that there was no correlation between tolerance to desiccation and ionizing radiation, suggesting that the physiological basis of both forms of tolerances is not necessarily linked. In addition, these results indicated that f...Continue Reading

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Citations

May 29, 2020·Journal of Food Protection·Sebastian HenzChristian Hertel
Apr 14, 2019·Microbial Ecology·Matthew Chidozie OgwuJonathan M Adams
Mar 12, 2021·Frontiers in Microbiology·Marta CortesãoRalf Moeller
Aug 14, 2021·FEMS Microbiology Letters·Juliane B MouraIolanda C Duarte

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Methods Mentioned

BETA
X-ray

Software Mentioned

MASE

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