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Legume Signals to Rhizobial Symbionts: A New Approach for Defining Rhizosphere Colonization

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Plant-Microbe Interactions

Part of the book series: Plant-Microbe Interactions ((PMI,volume 1))

Abstract

Classic observations describe distinctive relationships that have evolved between roots and their associated microbes:1 (1) The rhizosphere, an imprecisely defined zone near, on, and within the root, contains much higher numbers of total bacteria than root-free soil; and (2) healthy plant roots growing in soil normally are colonized by a limited number of bacterial species, which include few pathogens. Detailed field studies with mangel2 and soybean3 showed that physiological traits of heterotrophic bacteria isolated from the rhizosphere differ markedly from those in root-free soil in terms of amino acid nutrition, carbon metabolism, extracellular enzymatic activities, and resistance to antimicrobial compounds. Despite such indications that striking, potentially beneficial microbial communities develop around plant roots, our knowledge of the genetic and physiological traits in microbes that confer rhizosphere competence4 is limited. A better understanding of factors controlling microbial communities in the rhizosphere could help establish superior strains of microsymbionts, such as Rhizobium and Bradyrhizobiwn, might suppress growth of microbial pathogens, and could make it possible to establish populations of genetically altered bacteria that degrade crop pesticides or fulfill other agriculturally useful roles.

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Authors
  1. Donald A. Phillips
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  2. Wolfgang Streit
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Editors and Affiliations

  1. Department of Microbiology, University of Tennessee, Knoxville, Knoxville, TN, 37996-0845, USA

    Gary Stacey

  2. Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Knoxville, TN, 37996-0845, USA

    Gary Stacey

  3. Dept. of Plant Pathology, University of California, Riverside, Riverside, CA, 92521, USA

    Noel T. Keen

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Phillips, D.A., Streit, W. (1996). Legume Signals to Rhizobial Symbionts: A New Approach for Defining Rhizosphere Colonization. In: Stacey, G., Keen, N.T. (eds) Plant-Microbe Interactions. Plant-Microbe Interactions, vol 1. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1213-0_7

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  • DOI: https://doi.org/10.1007/978-1-4613-1213-0_7

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