Abstract
The taxonomic position of the free-living diazotrophic strain COC8(T) isolated from rice was investigated based on phylogenetic analyses. 16S rRNA gene sequence analyses indicated that strain COC8(T) was closely related to the genus Azospirillum (96% similarity). Chemotaxonomic characteristics (G+C content of the DNA 66.8 mol%, Q-10 quinone system, 18:1omega7c as the major fatty acid and 14:0 3-OH and 16:0 3-OH as the major hydroxy fatty acids) were also similar to those of the genus Azospirillum. Based on its physiological characteristics, strain COC8(T) can clearly be differentiated from recognized species of Azospirillum. The name Azospirillum oryzae sp. nov. is proposed to accommodate this bacterial strain; the type strain is COC8(T) (=IAM 15130(T)=CCTCC AB204051(T)).
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