Differences in vegetation composition and plant species identity lead to only minor changes in soil-borne microbial communities in a former arable field

Kielak, Anna M.; Pijl, Agata; Veen, Johannes A. van; Kowalchuk, George A.

doi:10.1111/j.1574-6941.2007.00428.x

Cited by 127 publications

(92 citation statements)

References 57 publications

(81 reference statements)

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“…Inconsistent relationships have been reported between above-ground plant vegetation and soil organism diversity (7,11,22,24), and total bacterial community structure is not necessarily correlated with soil nutrient status (13). In the present study, the community structure of sphingomonads in the soil collected from a plot growing one species of plant was somewhat different from that of other plots (Fig.…”

Section: Discussionmentioning

confidence: 62%

Abundance and Community Structure of Sphingomonads in Leaf Residues and Nearby Bulk Soil

2010

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We examined the abundance and community structure of sphingomonads in the decaying leaf residues of eight plant species as well as the nearby soil, by 16S rRNA gene-based real-time PCR and denaturing gradient gel electrophoresis. In the leaf residues, the sphingomonads generally accumulated to high levels, comprising approximately 15% of the total bacteria, and formed a community structure related to sampling locations. At least within the time period studied, their abundance in leaf residues changed, but their community structure was basically maintained. In soil, sphingomonads made up only 1.7% of total bacteria on average. The community structure of sphingomonads differed between the leaf residues and bulk soil, among plant plots, and among samples collected at different times. The results show that particular sphingomonad populations accumulate in leaf residues compared to the surrounding bulk soil under field conditions.

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Section: Discussionmentioning

confidence: 62%

Abundance and Community Structure of Sphingomonads in Leaf Residues and Nearby Bulk Soil

2010

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“…Buyer et al (1999) also failed to observe differences among the microbial communities from rhizospheres from different plant species growing in the same soil. Kielak et al (2008) observed that differences in vegetation composition and plant species led to only minor changes in soil microbial communities in a former arable field. The authors suggested that this result could be because some soils may be less predisposed to revealing rhizosphere effects.…”

Section: Discussionmentioning

confidence: 98%

Bacterial diversity in rhizosphere soil from Antarctic vascular plants of Admiralty Bay, maritime Antarctica

et al. 2010

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The Antarctic is a pristine environment that contributes to the maintenance of the global climate equilibrium. The harsh conditions of this habitat are fundamental to selecting those organisms able to survive in such an extreme habitat and able to support the relatively simple ecosystems. The DNA of the microbial community associated with the rhizospheres of Deschampsia antarctica Desv (Poaceae) and Colobanthus quitensis (Kunth) BartI (Caryophyllaceae), the only two native vascular plants that are found in Antarctic ecosystems, was evaluated using a 16S rRNA multiplex 454 pyrosequencing approach. This analysis revealed similar patterns of bacterial diversity between the two plant species from different locations, arguing against the hypothesis that there would be differences between the rhizosphere communities of different plants. Furthermore, the phylum distribution presented a peculiar pattern, with a bacterial community structure different from those reported of many other soils. Firmicutes was the most abundant phylum in almost all the analyzed samples, and there were high levels of anaerobic representatives. Also, some phyla that are dominant in most temperate and tropical soils, such as Acidobacteria, were rarely found in the analyzed samples. Analyzing all the sample libraries together, the predominant genera found were Bifidobacterium (phylum Actinobacteria), Arcobacter (phylum Proteobacteria) and Faecalibacterium (phylum Firmicutes). To the best of our knowledge, this is the first major bacterial sequencing effort of this kind of soil, and it revealed more than expected diversity within these rhizospheres of both maritime Antarctica vascular plants in Admiralty Bay, King George Island, which is part of the South Shetlands archipelago.

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“…However, bacterial diversity in the rhizosphere is generally lower than in the bulk soil (Marilley and Aragno, 1999), and microbial community composition is very different (Smalla et al, 2001;Kowalchuk et al, 2002;Griffiths et al, 2006;Kielak et al, 2008), suggesting a strongly selective environment. This selection pressure results from the exudation of specialized antimicrobials and signaling molecules (for example, flavonoids, salicylic acid and phytoalexins), carbon (for example, organic acids and aromatic compounds) and nitrogen (for example, amino acids) compounds.…”

Section: Introductionmentioning

confidence: 99%

Microbial expression profiles in the rhizosphere of willows depend on soil contamination

et al. 2013

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The goal of phytoremediation is to use plants to immobilize, extract or degrade organic and inorganic pollutants. In the case of organic contaminants, plants essentially act indirectly through the stimulation of rhizosphere microorganisms. A detailed understanding of the effect plants have on the activities of rhizosphere microorganisms could help optimize phytoremediation systems and enhance their use. In this study, willows were planted in contaminated and non-contaminated soils in a greenhouse, and the active microbial communities and the expression of functional genes in the rhizosphere and bulk soil were compared. Ion Torrent sequencing of 16S rRNA and Illumina sequencing of mRNA were performed. Genes related to carbon and amino-acid uptake and utilization were upregulated in the willow rhizosphere, providing indirect evidence of the compositional content of the root exudates. Related to this increased nutrient input, several microbial taxa showed a significant increase in activity in the rhizosphere. The extent of the rhizosphere stimulation varied markedly with soil contamination levels. The combined selective pressure of contaminants and rhizosphere resulted in higher expression of genes related to competition (antibiotic resistance and biofilm formation) in the contaminated rhizosphere. Genes related to hydrocarbon degradation were generally more expressed in contaminated soils, but the exact complement of genes induced was different for bulk and rhizosphere soils. Together, these results provide an unprecedented view of microbial gene expression in the plant rhizosphere during phytoremediation.

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Differences in vegetation composition and plant species identity lead to only minor changes in soil-borne microbial communities in a former arable field

Cited by 127 publications

References 57 publications

Abundance and Community Structure of Sphingomonads in Leaf Residues and Nearby Bulk Soil

Abundance and Community Structure of Sphingomonads in Leaf Residues and Nearby Bulk Soil

Bacterial diversity in rhizosphere soil from Antarctic vascular plants of Admiralty Bay, maritime Antarctica

Microbial expression profiles in the rhizosphere of willows depend on soil contamination

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