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...
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ftpubmed:oai:pubmedcentral.nih.gov:1388766 2023-05-15T13:41:05+02:00 Adaptation of Psychrophilic and Psychrotrophic Sulfate-Reducing Bacteria to Permanently Cold Marine Environments Isaksen, M. F. Jorgensen, B. B. 1996-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1388766 http://www.ncbi.nlm.nih.gov/pubmed/16535228 en eng http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1388766 http://www.ncbi.nlm.nih.gov/pubmed/16535228 Research Article Text 1996 ftpubmed 2013-08-30T22:05:36Z 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. Text Antarc* Antarctica Weddell Sea PubMed Central (PMC) Weddell Sea Weddell Mariager Fjord ENVELOPE(-21.833,-21.833,71.000,71.000) |
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English |
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Research Article Isaksen, M. F. Jorgensen, B. B. Adaptation of Psychrophilic and Psychrotrophic Sulfate-Reducing Bacteria to Permanently Cold Marine Environments |
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Research Article |
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 |
Text |
author |
Isaksen, M. F. Jorgensen, B. B. |
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 |
publishDate |
1996 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1388766 http://www.ncbi.nlm.nih.gov/pubmed/16535228 |
long_lat |
ENVELOPE(-21.833,-21.833,71.000,71.000) |
geographic |
Weddell Sea Weddell Mariager Fjord |
geographic_facet |
Weddell Sea Weddell Mariager Fjord |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1388766 http://www.ncbi.nlm.nih.gov/pubmed/16535228 |
_version_ |
1766145508471996416 |