Reclassification of Arthrobacter viscosus as Rhizobium viscosum comb. nov
2017
The species
Arthrobacter viscosus
was isolated from soil from Guatemala and it was classified into the genus
Arthrobacter
on the basis of phenotypic traits. Nevertheless, the results of16S rRNA gene analysis indicated that this species is a member of the genus
Rhizobium
, with
Rhizobium alamii
GBV016T and
Rhizobium mesosinicum
CCBAU 25010T as the most closely related species with 99.64 and 99.48 % similarity, respectively. The similarity values for the recA gene are 92.2 and 94.4 % with respect to
R. alamii
GBV016T and
R. mesosinicum
CCBAU 25010T, respectively, and those for the atpD gene are 92.9 and 98.7 %, respectively. Results of DNA–DNA hybridization analysis yield averages of 46 and 41 % relatedness with respect to the type strains of
R. alamii
and
R. mesosinicum
, respectively. Phenotypic characteristics also differed from those of the most closely related species of the genus
Rhizobium
. Therefore, based on the data obtained in this study, we propose to classify strain LMG 16473T as representing a novel species named
Rhizobium
viscosum comb. nov. (type strain LMG 16473T=CECT 908T).
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