Open AccessCompetition for nitrate between denitrifying Pseudomonas stutzeri and nitrate ammonifying enterobacteria
Author(s) -
Rehr Bert,
Klemme JobstHeinrich
Publication year - 1989
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1989.tb03657.x
Subject(s) - denitrifying bacteria , pseudomonas stutzeri , nitrate , denitrification , citrobacter freundii , chemistry , environmental chemistry , aerobic denitrification , biology , nitrogen , biochemistry , bacteria , klebsiella pneumoniae , organic chemistry , escherichia coli , gene , genetics
Competition for nitrate between nitrate ammonifying enterobacteria and a denitrifying pseudomonad was studied in electron acceptor‐limited chenostats. In pure cultures, using different carbon and energy sources, the C/N‐ratio needed for denitrification is far lower than that required for nitrate ammonification. In mixed cultures of Citrobacter freundii and Pseudomonas stutzeri , competing for nitrate with l ‐lactate as electron donor, the nitrate ammonifying organism dominated at dilution rates of D ≤ 0.14 h −1 . Competition for both nitrate and l ‐lactate at a dilution rate of D = 0.05 h −1 always resulted in the coexistence of both species. Using glucose as additional carbon source, the final ratio of nitrate ammonifying and denitrifying organism depended on the C/N‐ratio as well as on the dilution rate. The results of the study are discussed with respect to field data.