Roseibium aestuarii sp. nov., isolated from Pearl River Estuary

Abstract

A novel bacterium, designated strain SYSU M00256-3 T , was isolated from a water sample collected from Pearl River Estuary at Guangzhou, PR China. Its taxonomic position was determined by using a polyphasic approach. Cells of the strain were Gramstaining-negative, motile, aerobic and rod-shaped with peritrichous flagella. It could grow at 15-45 °C, pH 4.0-10.0 and in the presence of 0-7.5 % (w/v) NaCl. The chemotaxonomic features of strain SYSU M00256-3 T included ubiquinone-10 (Q-10) as the sole respiratory quinone; phosphatidylcholine, phosphatidylmethylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and an unidentified phospholipid as major polar lipids; summed feature 8 (C 18 : 1 ω7c and C 18 : 1 ω6c) as the predominant fatty acids (>70 %). On the basis of 16S rRNA gene sequence analysis, strain SYSU M00256-3 T was most closely related to the type strains of

Roseibium litorale sp. nov., isolated from a tidal flat sediment and proposal for the reclassification of Labrenzia polysiphoniae as Roseibium polysiphoniae comb. nov.

“…suaedae KACC 13772 T [10] and ‘ L. callyspongiae ’ JCM 31309 T [7]. The respiratory quinones of strain 4C16A T were identified as ubiquinone-9 (Q-9; 49.6 %) and ubiquinone-10 (Q-10; 50.4 %), and the latter is a major respiratory quinone within the genus Roseibium [5, 8].…”

“…The other two species, Labrenzia polysiphoniae [5,6] and 'Labrenzia callyspongiae' [7] (the name of the latter is effectively but not yet validly published and thus is in quotation marks throughout this study), have not been emended, probably due to the proposal of these two species later than the beginning of Hördt's study [3], and thus the taxonomic status of the two species remains to be confirmed. Taxonomically, members of the genus Roseibium are characterized as Gramstain-negative, non-spore-forming, rod-shaped, aerobic and chemoorganotrophic bacteria [5,8]. Most species of this genus possess summed feature 8 as the predominant fatty acid and Q-10 as the major ubiquinone [5,8].…”

“…Taxonomically, members of the genus Roseibium are characterized as Gramstain-negative, non-spore-forming, rod-shaped, aerobic and chemoorganotrophic bacteria [5,8]. Most species of this genus possess summed feature 8 as the predominant fatty acid and Q-10 as the major ubiquinone [5,8]. Some species can synthesize photosynthetic pigment bacteriochlorophyll a (BChl a) and contain the gene encoding carbon monoxide (CO) dehydrogenase [2].…”

“…Some species can synthesize photosynthetic pigment bacteriochlorophyll a (BChl a) and contain the gene encoding carbon monoxide (CO) dehydrogenase [2]. Bacteria of the genus Roseibium are widely distributed in nature and have been isolated from diverse environments, such as the rhizosphere of the halophyte Arthrocnemum macrostachyum [9] and Suaeda maritima [10], marine rhodophyta [1] and dinoflagellate [2], sediments of the Baltic Sea, the Shark Bay [1] and the Bohai Sea [11], saline water of Dasugan Lake [12], seawater of the West Sea [2], freshwater of the Pearl River estuary [8] and Mediterranean oysters [13], clearly indicating their wide environmental adaptation. Some isolates of this genus can produce sulfated exopolysaccharide as a potential antioxidant molecule [14], cyclopropane-containing medium-chain fatty acids with an antimicrobial activity [15], a pederin analogue labrenzin [16] and the catecholate-type siderophore of labrenzbactin [17].…”

Roseibium limicola sp. nov., isolated from tidal mudflat

“…[1], is affiliated with the family Rhodobacteraceae. At the time of writing, the genus Roseibium belongs to the class Alphaproteobacteria and includes 13 validly described species (https://lpsn.dsmz.de/genus/roseibium) widely isolated from diverse environments, such as sand [1], marine sediment [2, 3], fresh water [4], oysters [5], dinoflagellate [6], saline lake [7], tidal-flat sediment [8, 9], red algae [1, 10] and rhizosphere of sea plant [11], and annual sea plant [12]. The taxonomy of most members in the genus Roseibium is rod-shaped, Gram-stain-negative, motile, chemoheterotrophic and non-spore-forming, with ubiquinone-10 (Q-10) as the major respiratory quinone and summed feature 8 containing C 18 : 1 ω 7 c and/or C 18 : 1 ω 6 c as the major fatty acid.…”