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Rapid changes in the rhizosphere bacterial community structure during re-colonization of sterilized soil

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Abstract

Diversity has been shown to be pivotal in ecosystem stability and resilience. It is therefore important to increase our knowledge about the development of diversity. The aim of this study was to investigate the temporal dynamics of the bacterial community structure in the rhizosphere of wheat plants growing in a soil in which the initial conditions for bacterial re-colonization were modified by mixing different amounts of sterilized with native soil at ratios of 19:1, 9:1, 4:1 and 1:1. Additional treatments comprised sterilized soil or native soil. Plant dry weight at day 20 decreased with increasing percentage of native soil in the mix. The bacterial community structure in the rhizosphere was assessed by polymerase chain reaction-denaturing gradient gel electrophoresis (DGGE) at days 3, 14 and 20 after planting. The bacterial community in the sterilized soil had a lower diversity and evenness than the native soil. Both diversity and evenness increased with time in the sterilized soil. Community structure in the different mixes changed over time and the changes were mix-specific. Principal component analyses of the DGGE banding patterns showed clear differences between the treatments particularly at day 3 and day 14 and revealed changes in community structure within a few days in a given treatment. The results of the present study show that bacterial communities rapidly re-colonize sterilized soil. During re-colonization, the community structure changes rapidly with a general trend towards higher diversity and evenness. The changes in community structure over time are also affected by the amount of sterile substrate to be re-colonized.

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Acknowledgement

We would like to thank Prof. Reinhard Lieberei from the Institute for Applied Botany, University of Hamburg, Germany for his support.

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Author notes

  1. Petra Marschner

    Present address: Soil and Land Systems, School of Earth and Environmental Sciences, University of Adelaide, D.P. 637, SA 5005, Australia

  2. Angelika Rumberger

    Present address: Department of Horticulture, Cornell University, 170 Plant Science Building, Ithaca, NY 14853, USA

Authors and Affiliations

  1. Institute for Applied Botany, University of Hamburg, Marseiller Strasse 7, 20355, Hamburg, Germany

    Petra Marschner & Angelika Rumberger

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  1. Petra Marschner
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  2. Angelika Rumberger
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Correspondence to Petra Marschner.

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Marschner, P., Rumberger, A. Rapid changes in the rhizosphere bacterial community structure during re-colonization of sterilized soil. Biol Fertil Soils 40, 1–6 (2004). https://doi.org/10.1007/s00374-004-0736-4

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