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Updated: May 26, 2026

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
Methylobacterium gnaphalii sp. nov., isolated from leaves of Gnaphalium spicatum
Akio Tani1, Nurettin Sahin2, Kazuhide Kimbara3
1Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, 710-0046 Okayama, Japan.
Abstract:
A pink-pigmented, facultatively methylotrophic bacterium, strain 23e(T), was isolated from the leaves of Gnaphalium spicatum (cudweed). The cells of strain 23e(T) were Gram-reaction negative, motile and non-spore-forming rods. On the basis of 16S rRNA gene sequence similarities, strain 23e(T) was related to Methylobacterium organophilum ATCC 27886(T) (97.1%) and Methylobacterium marchantiae JT1(T) (97%), and the phylogenetic similarities to all other Methylobacterium species with validly published names were less than 97%. Major cellular fatty acids were C(18:1)ω7c, C(16:00) and C(18:0). The results of DNA-DNA hybridization, phylogenetic analyses based on 16S rRNA and cpn60 gene sequences, fatty acid profiles, whole-cell matrix-assisted laser desorption/ionization time of flight/MS analysis, physiological and biochemical tests allowed genotypic and phenotypic differentiation of strain 23e(T) from the phylogenetically closest relatives. We propose that strain 23e(T) represents a novel species within the genus Methylobacterium, for which the name Methylobacterium gnaphalii sp. nov. is proposed. The type strain is 23e(T) (=DSM 24027(T)=NBRC 107716(T)).
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