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Applied and Environmental Microbiology, September 2000, p. 3998-4003, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Response of a Soil Bacterial Community to Grassland Succession as
Monitored by 16S rRNA Levels of the Predominant Ribotypes
Andreas
Felske,*
Arthur
Wolterink,
Robert
Van
Lis,
Willem M.
De Vos, and
Antoon D. L.
Akkermans
Laboratory of Microbiology, Department of
Biomolecular Sciences, Wageningen University, 6703 CT Wageningen,
The Netherlands
Received 6 December 1999/Accepted 2 June 2000
The composition of predominant soil bacteria during grassland
succession was investigated in the Dutch Drentse A area. Five meadows,
taken out of agricultural production at different time points, and one
currently fertilized plot represented different stages of grassland
succession. Since fertilization and agricultural production were
stopped, the six plots showed a constant decline in the levels of
nutrients and vegetation changes. The activity of the predominant
bacteria was monitored by direct ribosome isolation from soil and
temperature gradient gel electrophoresis of reverse transcription
(RT)-PCR products generated from bacterial 16S rRNA. The amounts of 16S
rRNA of 20 predominant ribosome types per gram of soil were monitored
via multiple competitive RT-PCR in six plots at different succession
stages. These ribosome types mainly represented Bacillus
and members of the Acidobacterium cluster and the
subclass of the class Proteobacteria. The 20 16S rRNA molecules monitored represented approximately half of all bacterial soil rRNA which was estimated by dot blot hybridizations of soil rRNA
with the Bacteria probe EUB338. The grasslands showed
highly reproducible and specific shifts of bacterial ribosome type
composition. The total bacterial ribosome level increased during the
first years after agricultural production and fertilization stopped. This correlated with the collapse of the dominant Lolium
perenne population and an increased rate of mineralization of
organic matter. The results indicate that there is a true correlation between the total activity of the bacterial community in soil and the
amount of bacterial ribosomes.
*
Corresponding author. Present address: Division of
Microbiology, GBF (National Research Center for Biotechnology),
Mascheroder Weg 1, D-38124 Braunschweig, Germany. Phone: 49 531 6181406. Fax: 49 531 6181411. E-mail: afe{at}gbf.de.
Applied and Environmental Microbiology, September 2000, p. 3998-4003, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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