A mesophilic, obligately anaerobic, propionate-producing fermentative bacterium, designated strain NM7T, was isolated from rural rice paddy field. Cells of strain NM7T are Gram-negative, non-motile, non-spore-forming, short rods, and negative for catalase. The strain grew optimally at 37 °C (the range for growth 15–40 °C) and pH 7.0 (pH 5.0–7.5). The strain could grow fermentatively on various sugars, including arabinose, xylose, fructose, galactose, glucose, mannose, cellobiose, lactose, maltose, sucrose, pectin and starch. The main end products of glucose fermentation were acetate and propionate. Yeast extract was not required but stimulated the growth. Nitrate, sulfate, thiosulfate, elemental sulfur, sulfite, and Fe(III) nitrilotriacetate were not used as terminal electron acceptors. The G+C content of genomic DNA was 42.8 mol%. The major cellular fatty acids were C15:0, anteiso-C15:0, C16:0, and C17:0. The most abundant polar lipid of strain NM7T was phosphatidylethanolamine. 16S rRNA gene sequence analysis revealed that it belongs to the family Porphyromonadaceae of the phylum Bacteroidetes. The closest recognized species was Paludibacter propionicigenes (91.4 % similarity in 16S rRNA gene sequence). A novel species, Paludibacter jiangxiensis sp. nov., is proposed to accommodate strain NM7T (=JCM 17480T = CGMCC 1.5150T = KCTC 5844T).
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We thank Mizuho Muramatsu in the National Institute of Advanced Industrial Science and Technology for the determinations of FAME and the DNA base composition. This work was supported by the Taishan Scholar Program of Shandong Province, the National Natural Science Foundation of China (51078344), National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2010BAC67B03), and the Program Foundation for the Talent Introduction by Qingdao City (11-2-4-15-YX).
Nucleotide sequence accession number: The GenBank/EMBL/DDBJ accession number of the 16S rRNA gene sequence of strain NM7T is GQ911566.
Communicated by Erko Stackebrandt.
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Qiu, YL., Kuang, XZ., Shi, XS. et al. Paludibacter jiangxiensis sp. nov., a strictly anaerobic, propionate-producing bacterium isolated from rice paddy field. Arch Microbiol 196, 149–155 (2014). https://doi.org/10.1007/s00203-013-0951-1
- Propionate production
- Paludibacter jiangxiensis