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Applied and Environmental Microbiology, December 1998, p. 4950-4957, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Analysis of the Dynamics of Bacterial Communities in the
Rhizosphere of the Chrysanthemum via Denaturing Gradient Gel
Electrophoresis and Substrate Utilization Patterns
Bernadette M.
Duineveld,1,*
Alexandre S.
Rosado,2
Jan Dirk
van Elsas,2 and
Johannes A.
van
Veen1
Institute of Evolutionary and Ecological
Sciences, University of Leiden, 2300 RA Leiden,1
and
DLO-Research Institute for Plant Protection, 6700 GW
Wageningen,2 The Netherlands
Received 24 February 1998/Accepted 23 July 1998
In order to gain a better understanding of the spatial and temporal
dynamics of bacterial communities of the rhizosphere of the
chrysanthemum, two complementary methods were used: a molecular bacterial community profiling method, i.e., 16S rRNA gene-based PCR
followed by denaturing gradient gel electrophoresis (DGGE), and an agar
plate method in which 11 sole-carbon-source utilization tests were
used. The DGGE patterns showed that the bacterial communities as
determined from direct rhizosphere DNA extracts were largely stable
along developing roots of the chrysanthemum, with very little change
over time or between root parts of different ages. The patterns were
also similar to those produced with DNA extracts obtained from bulk
soil samples. The DGGE patterns obtained by using microbial colonies
from dilution plates as the source of target DNA were different from
those found with the direct DNA extracts. Moreover, these patterns
showed differences among plant replicates but also among replicate
plates. Results obtained with the sole-carbon-source utilization tests
indicated that the metabolic profile of the bacterial communities in
the rhizosphere of the root tip did not change substantially during
plant growth. This suggests selective development of specific bacterial
populations by the presence of a root tip. On the other hand, the
metabolic profile of bacterial communities in the rhizosphere of the
root base changed during plant growth. With eight sole-carbon-source utilization tests, a significant effect of the development stage of the
plant on the number of bacteria which were able to grow on these carbon
sources was observed.
*
Corresponding author. Mailing address: Institute of
Evolutionary and Ecological Sciences, University of Leiden, P.O. Box
9516, 2300 RA Leiden, The Netherlands. Phone: 31 (0) 71 527 51 58. Fax: 31 (0) 71 527 49 00. E-mail:
duineveld{at}rulsfb.leidenuniv.nl.
Applied and Environmental Microbiology, December 1998, p. 4950-4957, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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