Euryhalocaulis caribicus gen. nov., sp. nov., a New Members of the Family Hyphomonadaceae Isolated from the Caribbean Sea
文摘
A new aerobic, Gram-negative, chemo-organotrophic, euryhaline bacterium, designated strain JL2009T, was isolated from surface water of the Caribbean Sea. The strain formed flaxen colonies on marine ager 2216 (MA; Difco) medium. Cells were dimorphic, with stalks or a polar flagellum, and reproduction occurred by means of binary fission. Growth occurred at 15-5?°C (optimum at 35?°C), 0-5?% (w/v) NaCl (optimum at 1-0?%) and pH 5- (optimum at pH 7-). Phylogenetic analysis based on 16S rRNA gene sequences showed that the strain formed a distinct evolutionary lineage within the family Hyphomonadaceae. Strain JL2009T was most closely related to Maricaulis parjimensis MCS 25T (92.2?% DNA sequence similarity), Woodsholea maritime CM2243T (90.9?%), and Oceanicaulis alexandrii C116-18T (90.9?%). The major respiratory quinone was Q-10. The dominant cellular fatty acids were summed feature 8 (C18:1 ω7c), C18:0 and 11-methyl C18:1 ω7c. The polar lipid pattern indicated the presence of phospholipid, phosphatidyl glycerol and glycolipids. The G?+?C content of the genomic DNA was 70.5?mol%. On the basis of the chemotaxonomic and phenotypic characteristics and the phylogenetic evidence, strain JL2009T represents a novel genus and species in the family Hyphomonadaceae, for which the name Euryhalocaulis caribicus gen. nov., sp. nov. is proposed. The type strain of Euryhalocaulis caribicus is JL2009T (=CGMCC 1.12036T?=?JCM 18163T).