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The inter-kingdom volatile signal indole promotes root development by interfering with auxin signalling

  • Bailly, Aurélien Department of Microbiology, Institute of Plant Biology, University of Zurich, Switzerland - Institute for Sustainability Sciences, Agroscope, Zurich, Switzerland
  • Groenhagen, Ulrike Institut für Organische Chemie, Technische Universität Braunschweig, Braunschweig, Germany
  • Schulz, Stefan Institut für Organische Chemie, Technische Universität Braunschweig, Braunschweig, Germany
  • Geisler, Markus Department of Biology – Plant Biology, University of Fribourg, Switzerland
  • Eberl, Leo Department of Microbiology, Institute of Plant Biology, University of Zurich, Switzerland
  • Weisskopf, Laure Department of Microbiology, Institute of Plant Biology, University of Zurich, Switzerland - Institute for Sustainability Sciences, Agroscope, Zurich, Switzerland
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    01.12.2014
Published in:
  • The Plant Journal. - 2014, vol. 80, no. 5, p. 758–771
plant microbe interaction
volatile organic compounds
auxin signalling
root development
Arabidopsis thaliana
Escherichia coli
plant growth promoting rhizobacteria
English Recently, emission of volatile organic compounds (VOCs) has emerged as a mode of communication between bacteria and plants. Although some bacterial VOCs that promote plant growth have been identified, their underlying mechanism of action is unknown. Here we demonstrate that indole, which was identified using a screen for Arabidopsis growth promotion by VOCs from soil-borne bacteria, is a potent plant-growth modulator. Its prominent role in increasing the plant secondary root network is mediated by interfering with the auxin-signalling machinery. Using auxin reporter lines and classic auxin physiological and transport assays we show that the indole signal invades the plant body, reaches zones of auxin activity and acts in a polar auxin transport-dependent bimodal mechanism to trigger differential cellular auxin responses. Our results suggest that indole, beyond its importance as a bacterial signal molecule, can serve as a remote messenger to manipulate plant growth and development.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Biological sciences
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/303887
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