title: Ulvan, a sulfated polysaccharide from green algae, activates plant immunity through the jasmonic acid signaling pathway.
abstract: The industrial use of elicitors as alternative tools for disease control needs the identification of abundant sources of them. We report on an elicitor obtained from the green algae Ulva spp. A fraction containing most exclusively the sulfated polysaccharide known as ulvan-induced expression of a GUS gene placed under the control of a lipoxygenase gene promoter. Gene expression profiling was performed upon ulvan treatments on Medicago truncatula and compared to phytohormone effects. Ulvan induced a gene expression signature similar to that observed upon methyl jasmonate treatment (MeJA). Involvement of jasmonic acid (JA) in ulvan response was confirmed by detecting induction of protease inhibitory activity and by hormonal profiling of JA, salicylic acid (SA) and abscisic acid (ABA). Ulvan activity on the hormonal pathway was further consolidated by using Arabidopsis hormonal mutants. Altogether, our results demonstrate that green algae are a potential reservoir of ulvan elicitor which acts through the JA pathway.
authors.affiliation: Laboratoire des Surfaces Cellulaires et Signalisation chez les Végétaux, Université de Toulouse, UPS, 24 Chemin de Borde Rouge, BP42617, Auzeville 31326 Castanet-Tolosan, France.
authors.forename: Valérie
authors.initials: V
authors.lastname: Jaulneau
authors.forename: Claude
authors.initials: C
authors.lastname: Lafitte
authors.forename: Christophe
authors.initials: C
authors.lastname: Jacquet
authors.forename: Sylvie
authors.initials: S
authors.lastname: Fournier
authors.forename: Sylvie
authors.initials: S
authors.lastname: Salamagne
authors.forename: Xavier
authors.initials: X
authors.lastname: Briand
authors.forename: Marie-Thérèse
authors.initials: MT
authors.lastname: Esquerré-Tugayé
authors.forename: Bernard
authors.initials: B
authors.lastname: Dumas
mesh_terms: D000085:Acetates / Q000276:immunology / Q000378:metabolism*; D000704:Analysis of Variance; D017360:Arabidopsis / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000378:metabolism; D002850:Chromatography, Gel; D003517:Cyclopentanes / Q000276:immunology / Q000378:metabolism*; D015870:Gene Expression / Q000187:drug effects; D005966:Glucuronidase / Q000378:metabolism; D046913:Medicago truncatula / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism; D009713:Nucleotidyltransferases / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D054883:Oxylipins / Q000276:immunology / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism; D011134:Polysaccharides / Q000302:isolation & purification / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects; D017550:Spectroscopy, Fourier Transform Infrared; D044445:Ulva / Q000737:chemistry*; D010453:Peptide Synthases
chemical_list: D000085:Acetates; D029681:Arabidopsis Proteins; D003517:Cyclopentanes; D005966:Glucuronidase; D009713:Nucleotidyltransferases; D054883:Oxylipins; D010937:Plant Growth Regulators; D011134:Polysaccharides; C072239:methyl jasmonate; C412831:AT2G46370 protein, Arabidopsis; D010453:Peptide Synthases
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