Acetonema longum gen.nov.sp.nov., an H2/CO2 acetogenic bacterium from the termite,Pterotermes occidentis |
| |
Authors: | Matthew D. Kane John A. Breznak |
| |
Affiliation: | (1) Department of Microbiology, Michigan State University, 48824-1101 East Lansing, MI, USA;(2) Center for Microbial Ecology, Michigan State University, 48824-1101 East Lansing, MI, USA |
| |
Abstract: | A previously undescribed, H2-oxidizing CO2-reducing acetogenic bacterium was isolated from gut contents of the wood-feeding termite, Pterotermes occidentis. Cells of representative strain APO-1 were strictly anaerobic, Gram-negative, endospore-forming motile rods which measured 0.30–0.40×6–60 m. Cells were catalase positive, oxidase negative, and had 51.5 mol percent G+C in their DNA. Optimum conditions for growth on H2+CO2 were at 30–33°C and pH (initial) 7.8, and under these conditions cells formed acetate according to the equation: 4 H2+2 CO2 CH3COOH+2 H2O. Other energy sources supporting good growth of strain APO-1 included glucose, ribose, and various organic acids. Acetate and butyrate were major fermentation products from most organic compounds tested, however propionate, succinate, and 1,2-propanediol were also formed from some substrates. Based on comparative analysis of 16S rRNA nucleotide sequences, strain APO-1 was related to, but distinct from, members of the genus Sporomusa. Moreover, physiological and morphological differences between strain APO-1 and the six known species of Sporomusa were significant. Consequently, it is proposed herewith that a new genus, Acetonema, be established with strain APO-1 as the type strain of the new species, Acetonema longum. A. longum may contribute to the nutrition of P. occidentis by forming acetate, propionate and butyrate, compounds which are important carbon and energy sources for termites. |
| |
Keywords: | Acetonema longum Termite Pterotermes occidentis Gut microbe Hydrogen Acetogenic anaerobe |
本文献已被 SpringerLink 等数据库收录! |
|