A Gram-negative bacterium, designated NS114T, was isolated from duplicate treatments of surface-sterilized Zea mays stems. The plants were grown in synthetic soil under greenhouse conditions and watered with fertilizer containing no nitrogen. Strain NS114T could not be isolated from plants watered with the standard level or 20% (w/v) of the standard level of nitrogen. Cells occurred as pairs in young cultures that attached to form angled arrangements in R2A broth and occasionally formed rounded, horseshoe arrangements in YM broth. Cell variation resulted in flocculent chains of coccoid cells in old cultures. Strain NS114T fermented glucose and sucrose. The G + C content was 48 mol%. Phylogenetic analysis of the 16S rRNA gene showed that the strain was a member of the domain Bacteria and branched from a point equidistant from an aquatic organism, Runella slithyformis and a marine isolate, 'Microscilla furvescens'. Phenotypic and genotypic analyses indicated that strain NS114T could not be assigned to any recognized genus; therefore a new genus and species, Dyadobacter fermentans gen. nov., sp. nov., is proposed, for which NS114T is the type strain.


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