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Isolation of a novel acidiphilic methanogen from an acidic peat bog
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Isolation of a novel acidiphilic methanogen from an acidic peat bog
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Journal Article
Isolation of a novel acidiphilic methanogen from an acidic peat bog
2006
Overview
A taste for acid
Microbiologists have succeeded in culturing the most acid-loving methanogen ever discovered. The new species, a member of the Methanomicrobiales group, was found in McLean Bog in New York State. It grows at a preferred pH of around 5, beating the previous record-holder,
Methanobacterium espanolae
, which has an optimum pH of between 5.5 and 6.0. Although some other methanogens can survive a pH as low as 4.5, the new species is the first to show growth and optimal methanogenesis in such acidic conditions. Microbes living in acidic soils are important sources of atmospheric methane, which is linked to global warming.
Acidic peatlands are among the largest natural sources of atmospheric methane and harbour a large diversity of methanogenic Archaea
1
. Despite the ubiquity of methanogens in these peatlands, indigenous methanogens capable of growth at acidic pH values have resisted culture and isolation
2
,
3
,
4
; these recalcitrant methanogens include members of an uncultured family-level clade in the Methanomicrobiales prevalent in many acidic peat bogs in the Northern Hemisphere
1
,
5
,
6
. However, we recently succeeded in obtaining a mixed enrichment culture of a member of this clade
7
. Here we describe its isolation and initial characterization. We demonstrate that the optimum pH for methanogenesis by this organism is lower than that of any previously described methanogen.
Publisher
Nature Publishing Group UK,Nature Publishing,Nature Publishing Group
Subject
/ Archaea
/ Biological and medical sciences
/ Biology of microorganisms of confirmed or potential industrial interest
/ Bogs
/ Culture
/ Fundamental and applied biological sciences. Psychology
/ Humanities and Social Sciences
/ letter
/ Methane
/ Methanomicrobiales - classification
/ Methanomicrobiales - genetics
/ Methanomicrobiales - isolation & purification
/ Methanomicrobiales - metabolism
/ Peat
/ RNA, Ribosomal, 16S - genetics
/ RNA, Ribosomal, 23S - genetics
/ Science
/ Wetlands
