title: Induction of gentisic acid 5-O-beta-D-xylopyranoside in tomato and cucumber plants infected by different pathogens.
abstract: Tomato plants infected with the citrus exocortis viroid exhibited strongly elevated levels of a compound identified as 2,5-dihydroxybenzoic acid (gentisic acid, GA) 5-O-beta-D-xylopyranoside. The compound accumulated early in leaves expressing mild symptoms from both citrus exocortis viroid-infected tomato, and prunus necrotic ringspot virus-infected cucumber plants, and progressively accumulated concomitant with symptom development. The work presented here demonstrates that GA, mainly associated with systemic infections in compatible plant-pathogen interactions [Bellés, J.M., Garro, R., Fayos, J., Navarro, P., Primo, J., Conejero, V., 1999. Gentisic acid as a pathogen-inducible signal, additional to salicylic acid for activation of plant defenses in tomato. Mol. Plant-Microbe Interact. 12, 227-235], is conjugated to xylose. Notably, this result contrasts with those previously found in other plant-pathogen interactions in which phenolics analogues of GA as benzoic or salicylic acids, are conjugated to glucose.
authors.affiliation: Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, Camino de Vera s/n, 46022 Valencia, Spain.
authors.forename: Joaquín
authors.initials: J
authors.lastname: Fayos
authors.forename: José María
authors.initials: JM
authors.lastname: Bellés
authors.forename: M Pilar
authors.initials: MP
authors.lastname: López-Gresa
authors.forename: Jaime
authors.initials: J
authors.lastname: Primo
authors.forename: Vicente
authors.initials: V
authors.lastname: Conejero
mesh_terms: D002957:Citrus / Q000821:virology; D018553:Cucumis sativus / Q000378:metabolism* / Q000821:virology; D005841:Gentisates / Q000737:chemistry / Q000378:metabolism*; D006027:Glycosides / Q000737:chemistry / Q000378:metabolism*; D019179:Ilarvirus / Q000472:pathogenicity*; D018551:Solanum lycopersicum / Q000378:metabolism* / Q000821:virology; D010935:Plant Diseases / Q000821:virology; D018515:Plant Leaves / Q000378:metabolism* / Q000821:virology; D027861:Prunus / Q000821:virology; D020156:Salicylic Acid / Q000737:chemistry / Q000378:metabolism; D014772:Viroids / Q000472:pathogenicity*
chemical_list: D005841:Gentisates; D006027:Glycosides; C509446:gentisic acid 5-O-xylopyranoside; D020156:Salicylic Acid; C010925:2,5-dihydroxybenzoic acid