Piriformospora indica affects plant growth by auxin production

Authors

  • Anke Sirrenberg,

    Corresponding author
    1. Albrecht von Haller Institute for Plant Sciences, Department of Plant Biochemistry, Georg-August University Göttingen, 37077 Göttingen, Germany
    2. Department of Crop Sciences, Molecular Phytopathology and Mycotoxin Research, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Cornelia Göbel,

    1. Albrecht von Haller Institute for Plant Sciences, Department of Plant Biochemistry, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Stephanie Grond,

    1. Institute of Organic and Biomolecular Chemistry, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Nadine Czempinski,

    1. Institute of Organic and Biomolecular Chemistry, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Astrid Ratzinger,

    1. Department of Crop Sciences, Molecular Phytopathology and Mycotoxin Research, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Petr Karlovsky,

    1. Department of Crop Sciences, Molecular Phytopathology and Mycotoxin Research, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Patricia Santos,

    1. Department of Botany, Stockholm University, 10691 Stockholm, Sweden
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  • Ivo Feussner,

    1. Albrecht von Haller Institute for Plant Sciences, Department of Plant Biochemistry, Georg-August University Göttingen, 37077 Göttingen, Germany
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  • Katharina Pawlowski

    1. Albrecht von Haller Institute for Plant Sciences, Department of Plant Biochemistry, Georg-August University Göttingen, 37077 Göttingen, Germany
    2. Department of Botany, Stockholm University, 10691 Stockholm, Sweden
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*e-mail: asirren@gwdg.de

Abstract

Piriformospora indica has been shown to improve the growth of many plant species including Arabidopsis thaliana, but the mechanism by which this is achieved is still unclear. Arabidopsis root colonization by P. indica was examined in sterile culture on the medium of Murashige and Skoog. P. indica formed intracellular structures in Arabidopsis root epidermal cells and caused changes in root growth, leading to stunted and highly branched root systems. This effect was because of a diffusible factor and could be mimicked by IAA. In addition, P. indica was shown to produce IAA in liquid culture. We suggest that auxin production affecting root growth is responsible for, or at least contributes to, the beneficial effect of P. indica on its host plants.

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