Microbial succession in the rhizosphere of live and decomposing barley roots as affected by the antagonistic strain Pseudomonas fluorescens DR54-BN14 or the fungicide imazalil

Thirup, Laila; Johansen, Anders; Winding, Anne

doi:10.1111/j.1574-6941.2003.tb01079.x

Cited by 35 publications

(19 citation statements)

References 44 publications

(76 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results presented here confirm previous findings showing changes in the rhizosphere microbial community structure exposed to exogenous bacterial inoculants (Kozdrój et al, 2004;Nacamulli et al, 1997;Thirup et al, 2003). Furthermore, this study indicates that even two species of the same genus can differently disturb the indigenous microbial communities of young maize seedlings.…”

Section: Resultssupporting

confidence: 81%

Microbial community in the rhizosphere of young maize seedlings is susceptible to the impact of introduced pseudomonads as indicated by FAME analysis

Kozdrój

2008

J. Gen. Appl. Microbiol.

View full text Add to dashboard Cite

Two species of Pseudomonas (i.e. P. chlororaphis or P. putida) derived from a maize rhizosphere were studied for their impact on the structure of the microbial community in the rhizosphere of young maize seedlings after inoculation. The culturable bacteria and total microbial communities were analyzed based on profiles of whole-cell fatty acid methyl esters (MIDI-FAME). The introduction of Pseudomonas species resulted in the shift from the Gram-positive dominated culturable community in the rhizosphere of uninoculated maize to more Gram-negative populations in the rhizospheres of the inoculated plants. For the total rhizosphere communities, 43, 47 and 42 FAMEs were detected in the uninoculated maize and the samples inoculated with P. chlororaphis or P. putida, respectively. In contrast to the culturable communities, low concentrations of marker FAMEs for Gram-positives (i15:0, a15:0, i16:0) were found in the profiles of the total rhizosphere communities. The maize inoculations resulted in an enrichment of some Gram-negative isolates; however, Gram-positive bacteria, Cytophaga/Flavobacterium and saprophytic fungi were found in the uninoculated rhizosphere.

show abstract

Section: Resultssupporting

confidence: 81%

Microbial community in the rhizosphere of young maize seedlings is susceptible to the impact of introduced pseudomonads as indicated by FAME analysis

Kozdrój

2008

J. Gen. Appl. Microbiol.

View full text Add to dashboard Cite

show abstract

“…Further, rhizosphere microbial communities can initially be dominated by r-strategists, such as Proteobacteria. As plants age, rhizosphere communities can be dominated by K-strategists, such as mutualistic bacteria and fungi, suggesting a succession of the rhizosphere communities [9,10,23,30,33,37,38]. Assessing rhizodeposition patterns and the specific bacterial populations within the rhizosphere were beyond the scope of this study, so it is unknown if Agrostis and Andropogon rhizospheres were responding to plant age-root exudation and/or undergoing succession, but these remain potential explanations for the observed patterns.…”

Section: Discussionmentioning

confidence: 95%

Temporal Dynamics in Rhizosphere Bacterial Communities of Three Perennial Grassland Species

2016

View full text Add to dashboard Cite

Abstract:Rhizodeposition is considered a primary reason for the plant identity effect. However, the detection of distinct rhizosphere bacterial communities (RBC) with different plant species has been variable. The aim of this study was to examine the potential explanations for this variability using three perennial grassland species. In a Kansas field experiment, over two growing seasons, we sampled RBC during the active growth and flowering stages of Agrostis gigantea, Andropogon gerardii and Helianthus maximiliani to: (1) determine the extent of the plant identity effect among these species and if the effect was maintained over time; (2) assess if RBC showed seasonal patterns, corresponding to plant phenology; and (3) examine if soil properties were important for structuring these communities. We found that Helianthus RBC were distinct from those of Agrostis and Andropogon only when Helianthus was flowering. Further, Helianthus RBC exhibited seasonal shifts corresponding to plant phenology. In contrast, Agrostis and Andropogon RBC were similar over time and exhibited gradual non-seasonal changes in compositions. Similar results were observed when accounting for soil properties. Overall, the observance of a plant identity effect depended on the plant species and when RBC were sampled. The seasonality of RBC also depended on the plant species examined.

show abstract

“…The numbers of bands in the litter were in the range found in rhizosphere and bulk soil by Duineveld et al (8) but were lower than the numbers of bands in mineral soils in northern Germany (more than 50 bands [unpublished data]) and in The Netherlands (about 50 bands [4]). Compared to the DGGE patterns for rhizosphere soil, the DGGE patterns for bulk soil are generally complex, with many distinct bands (30).…”

Section: Discussionmentioning

confidence: 99%

Bacterial Diversity in Agricultural Soils during Litter Decomposition

Dilly

Bloem²,

Vos³

et al. 2004

Appl Environ Microbiol

176

View full text Add to dashboard Cite

Denaturing gradient gel electrophoresis (DGGE) of amplified fragments of genes coding for 16S rRNA was used to study the development of bacterial communities during decomposition of crop residues in agricultural soils. Ten strains were tested, and eight of these strains produced a single band. Furthermore, a mixture of strains yielded distinguishable bands. Thus, DGGE DNA band patterns were used to estimate bacterial diversity. A field experiment performed with litter in nylon bags was used to evaluate the bacterial diversity during the decomposition of readily degradable rye and more refractory wheat material in comparable luvisols and cambisols in northern, central, and southern Germany. The amount of bacterial DNA in the fresh litter was small. The DNA content increased rapidly after the litter was added to the soil, particularly in the rapidly decomposing rye material. Concurrently, diversity indices, such as the Shannon-Weaver index, evenness, and equitability, which were calculated from the number and relative abundance (intensity) of the bacterial DNA bands amplified from genes coding for 16S rRNA, increased during the course of decomposition. This general trend was not significant for evenness and equitability at any time. The indices were higher for the more degradation-resistant wheat straw than for the more easily decomposed rye grass. Thus, the DNA band patterns indicated that there was increasing bacterial diversity as decomposition proceeded and substrate quality decreased. The bacterial diversity differed for the sites in northern, central, and southern Germany, where the same litter material was buried in the soil. This shows that in addition to litter type climate, vegetation, and indigenous microbes in the surrounding soil affected the development of the bacterial communities in the litter.

show abstract

Microbial succession in the rhizosphere of live and decomposing barley roots as affected by the antagonistic strain Pseudomonas fluorescens DR54-BN14 or the fungicide imazalil

Cited by 35 publications

References 44 publications

Microbial community in the rhizosphere of young maize seedlings is susceptible to the impact of introduced pseudomonads as indicated by FAME analysis

Microbial community in the rhizosphere of young maize seedlings is susceptible to the impact of introduced pseudomonads as indicated by FAME analysis

Temporal Dynamics in Rhizosphere Bacterial Communities of Three Perennial Grassland Species

Bacterial Diversity in Agricultural Soils during Litter Decomposition

Contact Info

Product

Resources

About