Cluster I

Recent quantitative analysis of a soil that oxidized atmospheric methane found that the most abundant pmoA type detected was a cluster named 'Cluster I' (Kolb et al., 2005; Ricke et al., 2005). This pmoA cluster had been infrequently detected in other upland soils as well (Knief et al., 2003) and may represent type II methanotrophs, despite its odd phylogenetic placement (Pacheco-Oliver et al., 2002). The quantitative evidence suggests that this cluster may be responsible for atmospheric methane uptake in some soils, although data are as yet limited (based on a single soil), and supporting evidence such as analysis of 13CH4-labelling patterns is lacking.

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