RESUMO
A Gram-reaction-negative, non-motile, aerobic bacterium, designated HJ50(T), was isolated from deep seawater of the East Sea, South Korea. Cells were ovoid to rod-shaped (0.5-0.8x1.3-3.0 mum), often with unequal ends, suggesting a budding mode of reproduction. The strain had an absolute requirement for sea salts and tolerated up to 20 % (w/v) sea salts. Propionate, dl-lactate, 2-ketogluconate, 3-hydroxybutyrate and rhamnose were used as growth substrates, but not mannitol, salicin, 4-hydroxybenzoate or acetate. The major fatty acid was summed feature 7 (C(18 : 1)omega7c/omega9t/omega12t) and the DNA G+C content was 59.0+/-0.1 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that this strain was affiliated with the genus Roseovarius. Similarities between the 16S rRNA gene sequence of strain HJ50(T) (1430 nt) and those of type strains of members of the genus Roseovarius were 94.1-96.3 %. DNA-DNA relatedness values between strain HJ50(T) and the type strains of members of the genus Roseovarius were low (1.3-24.6 %). Physiological and biochemical differences support assignment of strain HJ50(T) to the genus Roseovarius as a representative of a novel species. The name Roseovarius halotolerans sp. nov. is proposed, with HJ50(T) (=KCTC 22224(T) =LMG 24468(T)) as the type strain.
Assuntos
Rhodobacteraceae/isolamento & purificação , Água do Mar/microbiologia , DNA Bacteriano/genética , DNA Ribossômico/genética , Ácidos Graxos/química , Ácidos Graxos/metabolismo , Dados de Sequência Molecular , Filogenia , RNA Ribossômico 16S/genética , Rhodobacteraceae/classificação , Rhodobacteraceae/genética , Rhodobacteraceae/metabolismoRESUMO
A strictly aerobic, non-spore-forming, Gram-negative bacterium, designated strain HW7(T), was isolated from a rice field in Korea. Cells of strain HW7(T) were short rod-shaped and motile with single polar flagella. The major cellular fatty acids of strain HW7(T) were C(16 : 0) and summed feature 3 (C(16 : 1)omega7c and/or iso-C(15 : 0) 2-OH). The genomic DNA G+C content was 56 mol% and the major isoprenoid quinone was Q-8. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain HW7(T) forms a distinct lineage with respect to closely related genera within the class Betaproteobacteria and that the levels of 16S rRNA gene sequence similarity with respect to the type species of related genera are less than 93 %. On the basis of the physiological and phylogenetic data, strain HW7(T) represents a novel genus and species of the Betaproteobacteria, for which the name Leeia oryzae gen. nov., sp. nov. is proposed. The type strain is HW7(T) (=KCTC 12585(T)=DSM 17879(T)).
