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The Rhizosphere: Molecular Interactions Between Microorganisms and Roots

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Growth and Defence in Plants

Part of the book series: Ecological Studies ((ECOLSTUD,volume 220))

Abstract

The rhizosphere has a large impact on plant performance in several ways. A stand-specific, more or less high diversity of microorganisms not only supports the plant in the acquisition of water and nutrients, but also modulates its ability to cope with pathogens. This diversity, however, has to be maintained and thus causes a considerable drain of photoassimilates, which are then not available for shoot development. In this chapter, we try to explain why the considerable allocation of carbon to the root system is a “wise” decision by the plant. We thus focus on the function of root-associated bacteria and their relevance for plant growth and development of disease resistance, and deliver data on the molecular basis of the root–fungus symbiosis (mycorrhiza).

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Acknowledgements

As far as own research has been addressed, financial support by the Deutsche Forschungsgemeinschaft is gratefully acknowledged. We are indebted to Nina Lehr, Silvia Schrey, and Mika Tarkka for their input, and to Reinhard Agerer for critical reading and many helpful suggestions. GB 4-2 was isolated by K. Poralla (University of Tübingen).

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  1. Physiological Ecology of Plants, IMIT, University of Tübingen, Auf der Morgenstelle 1, 72076, Tübingen, Germany

    R. Hampp

  2. Department Microbe-Plant Interactions, German Research Center for Environmental Health, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany

    A. Hartmann

  3. Botany, University of Bremen, Leobener Str. 2, 28359, Bremen, Germany

    U. Nehls

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  1. Chair of Ecophysiology of Plants, Technical University of Munich Chair of Ecophysiology of Plants, Freising, Germany

    Rainer Matyssek

  2. Chair of Grassland Science, Technische Universität München, Freising, Germany

    Hans Schnyder

  3. Chair of Phytopathology of Woody Plants, Technische Universität München, Freising, Germany

    Wolfgang Oßwald

  4. Institute of Biochemcial Plant Biology, Helmholtz-Zentrum München, Neuherberg, Germany

    Dieter Ernst

  5. Institute of Soil Ecology, Helmholtz-Zentrum München, Neuherberg, Germany

    Jean Charles Munch

  6. LS Waldwachstumskunde, TU München LS Waldwachstumskunde, Freising, Germany

    Hans Pretzsch

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Hampp, R., Hartmann, A., Nehls, U. (2012). The Rhizosphere: Molecular Interactions Between Microorganisms and Roots. In: Matyssek, R., Schnyder, H., Oßwald, W., Ernst, D., Munch, J., Pretzsch, H. (eds) Growth and Defence in Plants. Ecological Studies, vol 220. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30645-7_5

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