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Applied and Environmental Microbiology, March 2000, p. 1209-1212, Vol. 66, No. 3
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Atypical Polyphosphate Accumulation by the Denitrifying Bacterium Paracoccus denitrificans

Yoram Barak and Jaap van Rijn*

Department of Animal Science, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel

Received 25 August 1999/Accepted 1 December 1999

Polyphosphate accumulation by Paracoccus denitrificans was examined under aerobic, anoxic, and anaerobic conditions. Polyphosphate synthesis by this denitrifier took place with either oxygen or nitrate as the electron acceptor and in the presence of an external carbon source. Cells were capable of poly-beta -hydroxybutyrate (PHB) synthesis, but no polyphosphate was produced when PHB-rich cells were incubated under anoxic conditions in the absence of an external carbon source. By comparison of these findings to those with polyphosphate-accumulating organisms thought to be responsible for phosphate removal in activated sludge systems, it is concluded that P. denitrificans is capable of combined phosphate and nitrate removal without the need for alternating anaerobic/aerobic or anaerobic/anoxic switches. Studies on additional denitrifying isolates from a denitrifying fluidized bed reactor suggested that polyphosphate accumulation is widespread among denitrifiers.

* Corresponding author. Mailing address: Department of Animal Science, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel. Phone: 972-8-9481302. Fax: 972-8-9465763. E-mail: vanrijn{at}agri.huji.ac.il.

Applied and Environmental Microbiology, March 2000, p. 1209-1212, Vol. 66, No. 3
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Gloess, S., Grossart, H.-P., Allgaier, M., Ratering, S., Hupfer, M. (2008). Use of Laser Microdissection for Phylogenetic Characterization of Polyphosphate-Accumulating Bacteria. Appl. Environ. Microbiol. 74: 4231-4235 [Abstract] [Full Text]  
  • Barak, Y., van Rijn, J. (2000). Relationship between Nitrite Reduction and Active Phosphate Uptake in the Phosphate-Accumulating Denitrifier Pseudomonas sp. Strain JR 12. Appl. Environ. Microbiol. 66: 5236-5240 [Abstract] [Full Text]  


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