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Appl Environ Microbiol. 1981 July; 42(1): 20-22

Syntrophic Association by Cocultures of the Methanol- and CO2-H2-Utilizing Species Eubacterium limosum and Pectin-Fermenting Lachnospira multiparus During Growth in a Pectin Medium

L. M. Rode1, B. R. Sharak Genthner2 and M. P. Bryant2

1 Department of Dairy Science, University of Wisconsin, Madison, Wisconsin 53706
2 Department of Dairy Science, University of Illinois, Urbana, Illinois 61801

ABSTRACT

Lachnospira multiparus grew very well in an anaerobic 0.2% pectin medium, whereas Eubacterium limosum, which utilizes methanol, H2-CO2, and lactate, did not. Cocultures of the two species grew at a somewhat more rapid growth rate than did L. multiparus alone and almost doubled the amount of growth as measured by optical density. In model experiments with cultures transferred once a day with a 2-day retention time, L. multiparus produced mainly acetate, methanol, ethanol, formate, lactate, CO2, and H2 from pectin. The coculture produced one-third more acetate, and butyrate and CO2 were the only other significant end products. The results are discussed in relationship to microbial metabolic interactions and interspecies hydrogen transfer.

Appl Environ Microbiol. 1981 July; 42(1): 20-22




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