Light-mediated nitrite accumulation during denitrification by Pseudomonas sp. strain JR12

Yoram Barak*, Yossi Tal, Jaap Van Rijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The effect of light on the denitrifying characteristics of a nonphotosynthetic denitrifier, Pseudomonas sp. strain JR12, was examined. Already at low light intensities, nitrite accumulated as a result of light inhibition of nitrite but not of nitrate reduction rates. Exposure of this bacterium to light caused a photooxidation of cytochrome c, an intermediate electron carrier in its respiratory pathway. Photoinhibition of nitrite reduction was reversible, as nitrite reduction rates returned to preillumination levels when light-exposed cells were returned to dark conditions. Antimycin A reversed the inhibitory effect of light on nitrite reduction by preventing a reversed electron flow. Aerobic respiration by this bacterium was not affected by light.

Original languageAmerican English
Pages (from-to)813-817
Number of pages5
JournalApplied and Environmental Microbiology
Issue number3
StatePublished - Mar 1998


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