title: Induction of p-coumaroyldopamine and feruloyldopamine, two novel metabolites, in tomato by the bacterial pathogen Pseudomonas syringae.
abstract: Inoculation of tomato plants (Solanum lycopersicum cv. Rutgers) with Pseudomonas syringae pv. tomato led to the production of a hypersensitive-like response in this pathovar of tomato. Accumulation of hydroxycinnamic acid amides (HCAA) of tyramine (p-coumaroyltyramine and feruloyltyramine) and dopamine (p-coumaroyldopamine and feruloyldopamine) was detected after bacterial infection. Two of them, p-coumaroyldopamine and feruloyldopamine, are described for the first time. The accumulation of HCAA was preceded by an increment of hydroxycinnamoyl-CoA:tyramine N-hydroxycinnamoyl transferase (THT) gene expression. HCAA also accumulated in transgenic NahG tomato plants overexpressing a bacterial salicylic hydroxylase. However, treatment of plants with the ethylene biosynthesis inhibitor, aminoethoxyvinilglycine, led to a reduction in the accumulation of THT transcripts and HCAA. Together, the results suggest that pathogen-induced induction of ethylene is essential for HCAA synthesis, whereas salicylic acid is not required for this response. In addition, notable antibacterial and antioxidant activities were found for the new HCAA, thus indicating that they could play a role in the defense of tomato plants against bacterial infection.
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: Laura
authors.initials: L
authors.lastname: Zacarés
authors.forename: María Pilar
authors.initials: MP
authors.lastname: López-Gresa
authors.forename: Joaquin
authors.initials: J
authors.lastname: Fayos
authors.forename: Jaime
authors.initials: J
authors.lastname: Primo
authors.forename: José María
authors.initials: JM
authors.lastname: Bellés
authors.forename: Vicente
authors.initials: V
authors.lastname: Conejero
mesh_terms: D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D003373:Coumaric Acids / Q000737:chemistry / Q000378:metabolism*; D004298:Dopamine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D005030:Ethylenes / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D005998:Glycine / Q000031:analogs & derivatives; D018551:Solanum lycopersicum / Q000378:metabolism* / Q000382:microbiology*; D015394:Molecular Structure; D018515:Plant Leaves / Q000378:metabolism / Q000382:microbiology; D044224:Pseudomonas syringae / Q000502:physiology*; D020156:Salicylic Acid / Q000378:metabolism; D015398:Signal Transduction; D013997:Time Factors; D014439:Tyramine / Q000031:analogs & derivatives / Q000378:metabolism
chemical_list: D003373:Coumaric Acids; D005030:Ethylenes; C001411:N-(4-hydroxy-beta-phenethyl)-4-hydroxycinnamide; C506151:N-coumaroyldopamine; C525182:feruloyldopamine; C074004:feruloyltyramine; C036216:ethylene; D000217:Acyltransferases; C108168:hydroxycinnamoyl-CoA-tyramine N-(hydroxycinnamoyl)transferase; D020156:Salicylic Acid; C088137:aminoethoxyvinylglycine; D005998:Glycine; D004298:Dopamine; D014439:Tyramine