Interactions between nitrifying and denitrifying bacteria in gnotobiotic microcosms planted with the emergent macrophyte Glyceria maxima

Abstract The population dynamics of the chemolithoautotrophic nitrifiers Nitrosomonas europaea and Nitrobacter winogradskyi were studied in gnotobiotic microcosms fed with ammonium in response to the presence or absence of the emergent macrophyte Glyceria maxima and the heterotrophic denitrifying ba...

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Published in:	FEMS microbiology ecology 1998-01, Vol.25 (1), p.63-78
Main Authors:	Bodelier, Paul L.E, Duyts, Henk, Blom, Cees W.P.M, Laanbroek, Hendrikus J
Format:	Article
Language:	eng
Subjects:	Agronomy. Soil science and plant productions Ammonium Animal, plant and microbial ecology Aquatic plants Bacteria Biochemistry and biology Biological and medical sciences Chemical, physicochemical, biochemical and biological properties Denitrification Denitrifying bacteria Diffusion layers Elongation Exudates Exudation Fundamental and applied biological sciences. Psychology Glyceria maxima Gnotobiotic Limiting factors Microbial ecology Microbiology Microcosm Microcosms Nitrification Nitrobacter Nitrobacter winogradskyi Nitrosomonas europaea Oxygen Oxygen consumption Physics, chemistry, biochemistry and biology of agricultural and forest soils Population dynamics Pseudomonas chlororaphis Root Root zone Soil Soil science
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Summary:	Abstract The population dynamics of the chemolithoautotrophic nitrifiers Nitrosomonas europaea and Nitrobacter winogradskyi were studied in gnotobiotic microcosms fed with ammonium in response to the presence or absence of the emergent macrophyte Glyceria maxima and the heterotrophic denitrifying bacterium Pseudomonas chlororaphis. By subjecting the plants to different day lengths, the effect of possibly limiting factors (i.e. oxygen and ammonium) on the interactions between the nitrifiers and denitrifying bacterium could be analysed. The presence of the plant had no effect on the growth of nitrifiers suggesting that, in addition to radial oxygen loss from the roots, other non-plant sources of oxygen (e.g. diffusion from the water layer) were important for nitrification. Potential nitrifying activities were suppressed by G. maxima due to ammonium uptake by the plants. Elongation of the day length in combination with the presence of G. maxima led to an increase in the number of P. chlororaphis. The presence of P. chlororaphis suppressed the growth of N. winogradskyi, but the growth of N. europaea and the potential nitrifying activities were not significantly affected. Potential denitrifying activities were stimulated by the plant, but showed no correlations with nitrifier activities or numbers. Apparently ammonium, and not oxygen, was the limiting factor for nitrification in the root zone of G. maxima. However, when the plant did not deplete the ammonium pool, P. chlororaphis could repress the nitrifiers indicating the latter's poor competitive status with respect to oxygen when the presence of root exudates allows for heterotrophic oxygen consumption.
ISSN:	0168-6496 1574-6941