title: Exogenous auxin affects the oxidative burst in barley roots colonized by Piriformospora indica.
abstract: Beside a cardinal role in coordination of many developmental processes in the plant, the phytohormone auxin has been recognized as a regulator of plant defense. The molecular mechanisms involved are still largely unknown. Using a sensitive chemiluminescence assay, which measures the oxidation of luminol in the presence of H₂O₂ by horseradish peroxidase (HRP), we report here on the ability of exogenously added indole-3-acetic acid (IAA) to enhance the suppressive effect of the root endophyte Piriformospora indica on the chitin-elicited oxidative burst in barley roots. Thus, the potential of P. indica to produce free IAA during the early colonization phase in barley might provide the symbiont with a means to interfere with the microbe-associated molecular patterns (MAMP)-triggered immunity.
authors: Max-Planck Institute for Terrestrial Microbiology; Marburg, Germany.
authors: Magdalena
authors: M
authors: Hilbert
authors: Robin
authors: R
authors: Nostadt
authors: Alga
authors: A
authors: Zuccaro
mesh_terms: D001487:Basidiomycota / Q000378:metabolism*; D002686:Chitin / Q000494:pharmacology; D060026:Endophytes / Q000378:metabolism; D001467:Hordeum / Q000187:drug effects* / Q000378:metabolism / Q000382:microbiology; D007210:Indoleacetic Acids / Q000378:metabolism / Q000494:pharmacology*; D010100:Oxygen / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism / Q000494:pharmacology; D057865:Plant Immunity / Q000187:drug effects*; D018517:Plant Roots / Q000187:drug effects* / Q000378:metabolism / Q000382:microbiology; D016897:Respiratory Burst; D013559:Symbiosis / Q000187:drug effects*
chemical_list: D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D002686:Chitin; C030737:indoleacetic acid; D010100:Oxygen
keywords: Hordeum vulgare; IAA; MAMP-triggered immunity; Piriformospora indica; chitin-elicited oxidative burst