Methylobacterium populi sp. nov., a novel aerobic, pink-pigmented, facultatively methylotrophic, methane-utilizing bacterium isolated from poplar trees (Populus deltoides×nigra DN34)

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Abstract
A pink-pigmented, aerobic, facultatively methylotrophic bacterium, strain BJ001T, was isolated from internal poplar tissues (Populus deltoides×nigraDN34) and identified as a member of the genusMethylobacterium. Phylogenetic analyses showed that strain BJ001Tis related toMethylobacterium thiocyanatum,Methylobacterium extorquens,Methylobacterium zatmaniiandMethylobacterium rhodesianum. However, strain BJ001Tdiffered from these species in its carbon-source utilization pattern, particularly its use of methane as the sole source of carbon and energy, an ability that is shared with only one other member of the genus,Methylobacterium organophilum. In addition, strain BJ001Tis the only member of the genusMethylobacteriumto be described as an endophyte of poplar trees. On the basis of its physiological, genotypic and ecological properties, the isolate is proposed as a member of a novel species of the genusMethylobacterium,Methylobacterium populisp. nov. (type strain, BJ001T=ATCC BAA-705T=NCIMB 13946T).

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