Microbial Ecology

, Volume 50, Issue 1, pp 73–81 | Cite as

Competing Factors of Compost Concentration and Proximity to Root Affect the Distribution of Streptomycetes

  • Ehud Inbar
  • Stefan J. Green
  • Yitzhak Hadar
  • Dror Minz
Microbial Ecology


Streptomycetes are important members of soil microbial communities and are particularly active in the degradation of recalcitrant macromolecules and have been implicated in biological control of plant disease. Using a streptomycetes-specific polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (PCR-DGGE) methodology coupled with band excision and sequence analysis, we examined the effect of grape marc compost amendment to soil on cucumber plant–associated streptomycetes community composition. We observed that both compost amendment and proximity to the root surface influenced the streptomycetes community composition. A strong root selection for a soil-derived Streptomycete, most closely related to Streptomycesthermotolerans, S. iakyrus, and S. thermocarboxydus, was independent of compost amendment rate. However, while the impact of compost amendment was mitigated with increasing proximity to the root, high levels of compost amendment resulted in the detection of compost-derived species on the root surface. Conversely, in rhizosphere and non-rhizosphere soils, the community composition of streptomycetes was affected strongly even by modest compost amendment. The application of a streptomycetes-specific PCR primer set combined with DGGE analysis provided a rapid means of examining the distribution and ecology of streptomycetes in soils and plant-associated environments.


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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Ehud Inbar
    • 1
    • 2
  • Stefan J. Green
    • 1
    • 2
  • Yitzhak Hadar
    • 1
  • Dror Minz
    • 2
  1. 1.Faculty of Agricultural, Food and Environmental Quality SciencesHebrew University of JerusalemIsrael
  2. 2.Institute of Soil, Water and Environmental SciencesAgricultural Research Organization, The Volcani CenterIsrael

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