Open AccessNitrate‐dependent anaerobic carbon monoxide oxidation by aerobic CO‐oxidizing bacteria
Author(s) -
King G.M.
Publication year - 2006
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.2006.00065.x
Subject(s) - denitrifying bacteria , anaerobic exercise , nitrate , biology , environmental chemistry , autotroph , denitrification , bacteria , botany , chemistry , ecology , nitrogen , organic chemistry , physiology , genetics
Two dissimilatory nitrate‐reducing ( Burkholderia xenovorans LB400 and Xanthobacter sp. str. COX) and two denitrifying isolates ( Stappia aggregata IAM 12614 and Bradyrhizobium sp. str. CPP), previously characterized as aerobic CO oxidizers, consumed CO at ecologically relevant levels (<100 ppm) under anaerobic conditions in the presence, but not absence, of nitrate. None of the isolates were able to grow anaerobically with CO as a carbon or energy source, however, and nitrate‐dependent anaerobic CO oxidation was inhibited by headspace concentrations >100–1000 ppm. Surface soils collected from temperate, subtropical and tropical forests also oxidized CO under anaerobic conditions with no lag. The observed activity was 25–60% less than aerobic CO oxidation rates, and did not appear to depend on nitrate. Chloroform inhibited anaerobic but not aerobic activity, which suggested that acetogenic bacteria may have played a significant role in forest soil anaerobic CO uptake.