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Ammonium-Oxidation at Low Ph by a Chemolithotrophic Bacterium Belonging to the Genus Nitrosospira

De Boer, W. and Klein Gunnewiek, P.J.A. and Laanbroek, H.J. (1995) Ammonium-Oxidation at Low Ph by a Chemolithotrophic Bacterium Belonging to the Genus Nitrosospira. Soil Biology & Biochemistry, 27, 127-132. ISSN 0038-0717.

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Official URL: http://dx.doi.org/10.1016/0038-0717(94)00157-V

Abstract

Ammonium-oxidizing bacteria of the genus Nitrosospira have often been isolated from acid soils. However, the lower pH- limit for nitrifying activity of these bacteria in pure cultures or in mixed cultures with Nitrobacter sp. is much higher than ambient soil-pH. This study shows that the acid- sensitive, ammonium-oxidizing bacterium Nitrosospira strain AHB1, which has been isolated from an acid heathland soil, could be adapted to oxidize ammonium at pH 4 in the presence of the acid-tolerant nitrite-oxidizing bacterium Nitrobacter strain NHB1. Adaptation could be achieved in two different ways: (1) by immobilizing the bacteria in alginate beads; and (2) by exposing them to pH-fluctuations. Thus, Nitrosospira spp may be involved in the oxidation of ammonium at an ambient low soil-pH, even though they appear to be acid-sensitive after isolation. [KEYWORDS: Acid forest soil; autotrophic nitrification; atmospheric deposition; nitrifying bacteria; heath soil; gel beads; nitrogen; nitrobacter; nitrite; netherlands]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10312
Deposited On:25 Nov 2011 01:00
Last Modified:31 Mar 2014 10:10

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