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1 Institute of Oceanography, National Taiwan University, PO Box 23-13, Taipei, Taiwan
2 Center for General Education, Leader University, No. 188, Sec. 5, An-Chung Rd, Tainan, Taiwan
Correspondence
Wung Yang Shieh
winyang{at}ntu.edu.tw
Two denitrifying strains of heterotrophic, facultatively anaerobic, marine bacteria, designated DN34T and DN33, were isolated from sea-water samples collected in Nanwan Bay, Kenting National Park, Taiwan. They were Gram-negative. Cells in late exponential to early stationary phase of growth were predominantly straight or curved rods, but Y- or V-shaped forms were also observed. They were motile by means of one to several lateral or subpolar flagella. Both strains required NaCl for growth and exhibited optimal growth at about 30 °C, pH 8 and 3 % NaCl. They were capable of anaerobic growth by carrying out denitrifying metabolism using nitrate, nitrite or nitrous oxide as terminal electron acceptors or, alternatively, by fermenting glucose, mannose, sucrose or trehalose as substrates. Anaerobic fermentative growth on glucose resulted in formation of various organic acids, including formate, lactate, acetate, pyruvate and fumarate. The major cellular fatty acids were 2-OH-14 : 0, 3-OH-14 : 0 and 16 : 0. DN34T and DN33 had DNA G+C contents of 51·7 and 51·6 mol%, respectively. Physiological characterization, together with phylogenetic analysis based on 16S rRNA gene sequence analysis, revealed that the two denitrifying strains could be accommodated in a novel genus, for which the name Pseudovibrio gen. nov. is proposed. Pseudovibrio denitrificans sp. nov. is the type species, with DN34T (=BCRC 17323T=JCM 12308T) as the type strain.
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Pseudovibrio denitrificans DN34T is AY486423.
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