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The Indolic Compound Hypaphorine Produced by Ectomycorrhizal Fungus Interferes with Auxin Action and Evokes Early Responses in Nonhost Arabidopsis thaliana
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The Indolic Compound Hypaphorine Produced by Ectomycorrhizal Fungus Interferes with Auxin Action and Evokes Early Responses in Nonhost Arabidopsis thaliana
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Journal Article
The Indolic Compound Hypaphorine Produced by Ectomycorrhizal Fungus Interferes with Auxin Action and Evokes Early Responses in Nonhost Arabidopsis thaliana
2002
Overview
Signals leading to mycorrhizal differentiation are largely unknown. We have studied the sensitivity of the root system from plant model Arabidopsis thaliana to hypaphorine, the major indolic compound isolated from the basidiomycetous fungus Pisolithus tinctorius. This fungi establishes ectomycorrhizas with Eucalyptus globulus. Hypaphorine controls root hair elongation and counteracts the activity of indole-3-acetic acid on root elongation on A. thaliana, as previously reported for the host plant. In addition, we show that hypaphorine counteracts the rapid upregulation by indole-3-acetic acid and 1-naphthalenic-acetic acid of the primary auxin-responsive gene IAA1 and induces a rapid, transient membrane depolarization in root hairs and suspension cells, due to the modulation of anion and K + currents. These early responses indicate that components necessary for symbiosis-related differentiation events are present in the nonhost plant A. thaliana and provide tools for the dissection of the hypaphorine-auxin interaction.
Publisher
APS Press,American Phytopathological Society,The American Phytopathological Society
Subject
Agronomy. Soil science and plant productions
/ anions
/ Arabidopsis - growth & development
/ Biological and medical sciences
/ cations
/ DNA-Binding Proteins - drug effects
/ Fundamental and applied biological sciences. Psychology
/ genes
/ genetics
/ Glutathione Transferase - drug effects
/ Glutathione Transferase - genetics
/ Indoleacetic Acids - pharmacology
/ Indoles
/ Membrane Potentials - drug effects
/ Mycorrhizae - growth & development
/ Naphthaleneacetic Acids - pharmacology
/ Nuclear Proteins - drug effects
/ Plant Roots - growth & development
/ Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
