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Abstract
Two anaerobic bacterial strains, MB9-7T and MB9-9, were isolated from decomposing algal scum and were characterized using a polyphasic approach. Phylogenetic analysis of 16S rRNA gene sequences showed that strains MB9-7T and MB9-9 are closely related to each other (99.7 % similarity) and they are also closely related to Clostridium tyrobutyricum (96.5 %). The two strains were Gram-stain positive and rod-shaped. Growth occurred at 20–45 °C, at pH 4.0–8.0 and at NaCl concentrations of up to 2 % (w/v). Acid was produced from glucose, xylose and mannose. Products of fermentation in PYG medium were mainly butyrate, acetate, carbon dioxide and hydrogen. The predominant cellular fatty acids were C14 : 0 and C16 : 0. The cellular polar lipids comprised phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, two glycolipids, one phospholipid, one aminophospholipid and two aminolipids. The DNA G+C contents of strain MB9-7T and MB9-9 were 27.9 and 28.7 mol%, respectively. These results support the assignment of the new isolates to the genus Clostridium and also distinguish them from other species of the genus Clostridium . Hence, it is proposed that strains MB9-7T and MB9-9 represent a novel species of the genus Clostridium , with the suggested name Clostridium algifaecis sp. nov. The type strain is MB9-7T ( = CGMCC 1.5188T = DSM 28783T).
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Funding
- National Science Foundation of China (Award U1202231)
- State Key Laboratory of Microbial Resources at the Institute of Microbiology, Chinese Academy of Sciences (Award SKLMR-20110605)