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  • Title: Rhodovulum salis sp. nov. and Rhodovulum viride sp. nov., phototrophic Alphaproteobacteria isolated from marine habitats.
    Author: Srinivas A, Kumar BV, Sree BD, Tushar L, Sasikala C, Ramana CV.
    Journal: Int J Syst Evol Microbiol; 2014 Mar; 64(Pt 3):957-962. PubMed ID: 24425825.
    Abstract:
    Two strains (JA746(T) and JA756(T)) having yellowish brown-to-green pigment were isolated from a solar saltern and a pink pond, respectively. While both strains were non-motile and shared the presence of bacteriochlorophyll-a, major cellular fatty acids (C18 : 1ω7c, C16 : 0, C18 : 0), quinone (Q-10), polar lipids and hopanoids, they differed from each other in their carotenoid composition. The G+C content of genomic DNA of strains JA746(T) and 756(T) was 62.4 and 63.3 mol%, respectively. The 16S rRNA gene-based EzTaxon-e blast search analysis of strains JA746(T) and 756(T) indicated highest sequence similarity with members of the genus Rhodovulum in the family Rhodobacteraceae of the class Alphaproteobacteria. Strain JA746(T) has high sequence similarities with Rhodovulum visakhapatnamense JA181(T) (97.3 %), Rhodovulum steppense A-20s(T) (97.3 %), Rhodovulum phaeolacus JA580(T) (97 %), Rhodovulum strictum MB-G2(T) (97 %) and other members of the genus Rhodovulum (<97 %). Strain JA756(T) has high sequence similarities with Rhodovulum visakhapatnamense JA181(T) (99.8 %), Rhodovulum sulfidophilum Hansen W4(T) (99.1 %), Rhodovulum kholense JA297(T) (97.9 %) and other members of the genus Rhodovulum (<97 %). The sequence similarity between strains JA746(T) and JA756(T) was 97.5 %. However, these strains are not closely related to each other or to their phylogenetic neighbours since the DNA-DNA reassociation values were less than 56 %. The genomic information was also supported by phenotypic and chemotaxonomic results, leading us to classify strains JA746(T) ( = NBRC 108898(T) = KCTC 15180(T)) and JA756(T) ( = NBRC 109122(T) = KCTC 15223(T)) as the type strains of two novel species of the genus Rhodovulum, for which the names Rhodovulum salis sp. nov. and Rhodovulum viride sp. nov. are proposed, respectively.
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