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Thermophilic methanogens in rice field soil

Thermophilic methanogens in rice field soil The soil temperature in flooded Italian rice fields is generally lower than 30°C. However, two temperature optima at ≈ 41°C and 50°C were found when soil slurries were anoxically incubated at a temperature range of 10–80°C. The second temperature optimum indicates the presence of thermophilic methanogens in the rice field soil. Experiments with 14C‐labelled bicarbonate showed that the thermophilic CH4 was exclusively produced from H2/CO2. Terminal restriction fragment length polymorphism (T‐RFLP) of archaeal SSU rRNA gene fragments revealed a dramatic change in the archaeal community structure at temperatures > 37°C, with the euryarchaeotal rice cluster I becoming the dominant group (about 80%). A clone library of archaeal SSU rRNA gene fragments generated at 49°C was also dominated (10 out of 11 clones) by rice cluster I. Our results demonstrate that Italian rice field soil contains thermophilic methanogenic activity that was most probably a result of members of the as yet uncultivated euryarchaeotal rice cluster I. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Microbiology Wiley

Thermophilic methanogens in rice field soil

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References (61)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1462-2912
eISSN
1462-2920
DOI
10.1046/j.1462-2920.2001.00195.x
Publisher site
See Article on Publisher Site

Abstract

The soil temperature in flooded Italian rice fields is generally lower than 30°C. However, two temperature optima at ≈ 41°C and 50°C were found when soil slurries were anoxically incubated at a temperature range of 10–80°C. The second temperature optimum indicates the presence of thermophilic methanogens in the rice field soil. Experiments with 14C‐labelled bicarbonate showed that the thermophilic CH4 was exclusively produced from H2/CO2. Terminal restriction fragment length polymorphism (T‐RFLP) of archaeal SSU rRNA gene fragments revealed a dramatic change in the archaeal community structure at temperatures > 37°C, with the euryarchaeotal rice cluster I becoming the dominant group (about 80%). A clone library of archaeal SSU rRNA gene fragments generated at 49°C was also dominated (10 out of 11 clones) by rice cluster I. Our results demonstrate that Italian rice field soil contains thermophilic methanogenic activity that was most probably a result of members of the as yet uncultivated euryarchaeotal rice cluster I.

Journal

Environmental MicrobiologyWiley

Published: May 1, 2001

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