Abstract
Root nodule isolates from a shrubby legume, Lotononis bainesii, were characterized by 16S rRNA gene sequencing and morphologically by substrate utilization patterns. The symbiotic genome of these isolates was analysed by partial sequencing of the nifH gene. Based on the results of numerical taxonomy, the isolates formed a closely related cluster, showing no correspondence to any of the known rhizobial clusters. Analysis of nearly full-length 16S rDNA sequences demonstrated that these isolates were related to Methylobacterium nodulans (SY et al., 2001). In the absence of nifH sequence data for the genus Methylobacterium, the nifH phylogeny showed these isolates to be related to Azospirillum brasilense. The facultative methylotrophic nature of these isolates was also demonstrated by their ability to grow in the presence of methanol as a sole carbon source.
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