Effect of temperature on sulphate reduction, growth rate and growth yield in five psychrophilic sulphate‐reducing bacteria from Arctic sediments
Five psychrophilic sulphate‐reducing bacteria (strains ASv26, LSv21, PSv29, LSv54 and LSv514) isolated from Arctic sediments were examined for their adaptation to permanently low temperatures. All strains grew at −1.8°C, the freezing point of sea water, but their optimum temperature for growth ( T o...
Published in: | Environmental Microbiology |
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Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1999
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Subjects: | |
Online Access: | http://dx.doi.org/10.1046/j.1462-2920.1999.00061.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1462-2920.1999.00061.x http://onlinelibrary.wiley.com/wol1/doi/10.1046/j.1462-2920.1999.00061.x/fullpdf |
Summary: | Five psychrophilic sulphate‐reducing bacteria (strains ASv26, LSv21, PSv29, LSv54 and LSv514) isolated from Arctic sediments were examined for their adaptation to permanently low temperatures. All strains grew at −1.8°C, the freezing point of sea water, but their optimum temperature for growth ( T opt ) were 7°C (PSv29), 10°C (ASv26, LSv54) and 18°C (LSv21, LSv514). Although T opt was considerably above the in situ temperatures of their habitats (−1.7°C and 2.6°C), relative growth rates were still high at 0°C, accounting for 25–41% of those at T opt . Short‐term incubations of exponentially growing cultures showed that the highest sulphate reduction rates occurred 2–9°C above T opt . In contrast to growth and sulphate reduction rates, growth yields of strains ASv26, LSv54 and PSv29 were almost constant between −1.8°C and T opt . For strains LSv21 and LSv514, however, growth yields were highest at the lowest temperatures, around 0°C. The results indicate that psychrophilic sulphate‐reducing bacteria are specially adapted to permanently low temperatures by high relative growth rates and high growth yields at in situ conditions. |
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