Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments
The potential for sulfate reduction at low temperatures was examined in two different cold marine sediments, Mariager Fjord (Denmark), which is permanently cold (3 to 6(deg)C) but surrounded by seasonally warmer environments, and the Weddell Sea (Antarctica), which is permanently below 0(deg)C. The...
Published in: | Applied and Environmental Microbiology |
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American Society for Microbiology
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Online Access: | http://dx.doi.org/10.1128/aem.62.2.408-414.1996 https://journals.asm.org/doi/pdf/10.1128/aem.62.2.408-414.1996 |
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crasmicro:10.1128/aem.62.2.408-414.1996 2024-06-23T07:45:58+00:00 Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments Isaksen, M F Jorgensen, B B 1996 http://dx.doi.org/10.1128/aem.62.2.408-414.1996 https://journals.asm.org/doi/pdf/10.1128/aem.62.2.408-414.1996 en eng American Society for Microbiology https://journals.asm.org/non-commercial-tdm-license Applied and Environmental Microbiology volume 62, issue 2, page 408-414 ISSN 0099-2240 1098-5336 journal-article 1996 crasmicro https://doi.org/10.1128/aem.62.2.408-414.1996 2024-06-10T04:07:04Z The potential for sulfate reduction at low temperatures was examined in two different cold marine sediments, Mariager Fjord (Denmark), which is permanently cold (3 to 6(deg)C) but surrounded by seasonally warmer environments, and the Weddell Sea (Antarctica), which is permanently below 0(deg)C. The rates of sulfate reduction were measured by the (sup35)SO(inf4)(sup2-) tracer technique at different experimental temperatures in sediment slurries. In sediment slurries from Mariager Fjord, sulfate reduction showed a mesophilic temperature response which was comparable to that of other temperate environments. In sediment slurries from Antarctica, the metabolic activity of psychrotrophic bacteria was observed with a respiration optimum at 18 to 19(deg)C during short-term incubations. However, over a 1-week incubation, the highest respiration rate was observed at 12.5(deg)C. Growth of the bacterial population at the optimal growth temperature could be an explanation for the low temperature optimum of the measured sulfate reduction. The potential for sulfate reduction was highest at temperatures well above the in situ temperature in all experiments. The results from sediment incubations were compared with those obtained from pure cultures of sulfate-reducing bacteria by using the psychrotrophic strain ltk10 and the mesophilic strain ak30. The psychrotrophic strain reduced sulfate optimally at 28(deg)C in short-term incubations, even though it could not grow at temperatures above 24(deg)C. Furthermore, this strain showed its highest growth yield between 0 and 12(deg)C. In contrast, the mesophilic strain ak30 respired and grew optimally and showed its highest growth yield at 30 to 35(deg)C. Article in Journal/Newspaper Antarc* Antarctica Weddell Sea ASM Journals (American Society for Microbiology) Mariager Fjord ENVELOPE(-21.833,-21.833,71.000,71.000) Weddell Weddell Sea Applied and Environmental Microbiology 62 2 408 414 |
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Open Polar |
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ASM Journals (American Society for Microbiology) |
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crasmicro |
language |
English |
description |
The potential for sulfate reduction at low temperatures was examined in two different cold marine sediments, Mariager Fjord (Denmark), which is permanently cold (3 to 6(deg)C) but surrounded by seasonally warmer environments, and the Weddell Sea (Antarctica), which is permanently below 0(deg)C. The rates of sulfate reduction were measured by the (sup35)SO(inf4)(sup2-) tracer technique at different experimental temperatures in sediment slurries. In sediment slurries from Mariager Fjord, sulfate reduction showed a mesophilic temperature response which was comparable to that of other temperate environments. In sediment slurries from Antarctica, the metabolic activity of psychrotrophic bacteria was observed with a respiration optimum at 18 to 19(deg)C during short-term incubations. However, over a 1-week incubation, the highest respiration rate was observed at 12.5(deg)C. Growth of the bacterial population at the optimal growth temperature could be an explanation for the low temperature optimum of the measured sulfate reduction. The potential for sulfate reduction was highest at temperatures well above the in situ temperature in all experiments. The results from sediment incubations were compared with those obtained from pure cultures of sulfate-reducing bacteria by using the psychrotrophic strain ltk10 and the mesophilic strain ak30. The psychrotrophic strain reduced sulfate optimally at 28(deg)C in short-term incubations, even though it could not grow at temperatures above 24(deg)C. Furthermore, this strain showed its highest growth yield between 0 and 12(deg)C. In contrast, the mesophilic strain ak30 respired and grew optimally and showed its highest growth yield at 30 to 35(deg)C. |
format |
Article in Journal/Newspaper |
author |
Isaksen, M F Jorgensen, B B |
spellingShingle |
Isaksen, M F Jorgensen, B B Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
author_facet |
Isaksen, M F Jorgensen, B B |
author_sort |
Isaksen, M F |
title |
Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
title_short |
Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
title_full |
Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
title_fullStr |
Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
title_full_unstemmed |
Adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
title_sort |
adaptation of psychrophilic and psychrotrophic sulfate-reducing bacteria to permanently cold marine environments |
publisher |
American Society for Microbiology |
publishDate |
1996 |
url |
http://dx.doi.org/10.1128/aem.62.2.408-414.1996 https://journals.asm.org/doi/pdf/10.1128/aem.62.2.408-414.1996 |
long_lat |
ENVELOPE(-21.833,-21.833,71.000,71.000) |
geographic |
Mariager Fjord Weddell Weddell Sea |
geographic_facet |
Mariager Fjord Weddell Weddell Sea |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_source |
Applied and Environmental Microbiology volume 62, issue 2, page 408-414 ISSN 0099-2240 1098-5336 |
op_rights |
https://journals.asm.org/non-commercial-tdm-license |
op_doi |
https://doi.org/10.1128/aem.62.2.408-414.1996 |
container_title |
Applied and Environmental Microbiology |
container_volume |
62 |
container_issue |
2 |
container_start_page |
408 |
op_container_end_page |
414 |
_version_ |
1802643226085031936 |