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Title of Journal: Plant Soil

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Abbravation: Plant and Soil

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Springer Netherlands

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Indirect effects of polycyclic aromatic hydrocarbon contamination on microbial communities in legume and grass rhizospheres

Authors: Akitomo Kawasaki, Erika R. Watson, Michael A. Kertesz,

Publish Date: 2011/12/30
Volume: 358, Issue:1-2, Pages: 169-182
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Biodegradation of polycyclic aromatic hydrocarbons (PAHs) is accelerated in the presence of plants, due to the stimulation of rhizosphere microbes by plant exudates (nonspecific enhancement). However, plants may also recruit specific microbial groups in response to PAH stress (specific enhancement). In this study, plant effects on the development of rhizosphere microbial communities in heterogeneously contaminated soils were assessed for three grasses (ryegrass, red fescue and Yorkshire fog) and four legumes (white clover, chickpea, subterranean clover and red lentil).Plants were cultivated using a split-root model with their roots divided between two independent pots containing either uncontaminated soil or PAH-contaminated soil (pyrene or phenanthrene). Microbial community development in the two halves of the rhizosphere was assessed by T-RFLP (bacterial and fungal community) or DGGE (bacterial community), and by 16S rRNA gene tag-pyrosequencing.In legume rhizospheres, the microbial community structure in the uncontaminated part of the split-root model was significantly influenced by the presence of PAH-contamination in the other part of the root system (indirect effect), but this effect was not seen for grasses. In the contaminated rhizospheres, Verrucomicrobia and Actinobacteria showed increased populations, and there was a dramatic increase in Denitratisoma numbers, suggesting that this genus may be important in rhizoremediation processes.This work was supported by the Heiwa Nakajima Foundation, the University of Manchester, Faculty of Life Sciences, and the University of Sydney, Faculty of Agriculture, Food and Natural Resources. We thank B. Singh for assistance with soil characterization data.



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Other Papers In This Journal:

  1. The effects of long-term fertilization on the temporal stability of alpine meadow communities
  2. Glyphosate reduces shoot concentrations of mineral nutrients in glyphosate-resistant soybeans
  3. Effects of grazing management system on plant community structure and functioning in a semiarid steppe: scaling from species to community
  4. DGT-measured fluxes explain the chloride-enhanced cadmium uptake by plants at low but not at high Cd supply
  5. Plant and soil responses of an alpine steppe on the Tibetan Plateau to multi-level nitrogen addition
  6. Higher plant diversity enhances soil stability in disturbed alpine ecosystems
  7. Inter-comparison of methods for quantifying above-ground leaf litter decomposition rates
  8. Contrasts in growth and nitrogen nutrition of species in the Cupressaceae and Pinaceae in response to calcium
  9. Concentration of cadmium in durum wheat as affected by time
  10. Grazing by bison is a stronger driver of plant ecohydrology in tallgrass prairie than fire history
  11. Semi-automatic control of soil water in pot culture
  12. The legacy of climate change effects: previous drought increases short-term litter decomposition rates in a temperate mixed grass- and shrubland
  13. Straw management
  14. Increasing fluctuations of soil salinity affect seedling growth performances and physiology in three Neotropical mangrove species
  15. Nickel bioavailability in an ultramafic toposequence in the Vosges Mountains (France)
  16. Decomposition-rate estimation of leaf litter in karst forests in China based on a mathematical model
  17. Land use change decreases soil carbon stocks in Tibetan grasslands
  18. Effect of silicate on phosphate availability for rice in a P-deficient soil
  19. Charcoal and shrubs modify soil processes in ponderosa pine forests of western Montana
  20. Factors regulating litter mass loss and lignin degradation in late decomposition stages
  21. Illite transformation and potassium release upon changes in composition of the rhizophere soil solution
  22. Maize seedling phosphorus nutrition: Allocation of remobilized seed phosphorus reserves and external phosphorus uptake to seedling roots and shoots during early growth stages
  23. Indirect effects of polycyclic aromatic hydrocarbon contamination on microbial communities in legume and grass rhizospheres

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