Induction of gentisic acid 5-O-beta-D-xylopyranoside in tomato and cucumber plants infected by different pathogens

Phytochemistry. 2006 Jan;67(2):142-8. doi: 10.1016/j.phytochem.2005.10.014.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Citrus / virology
  • Cucumis sativus / metabolism*
  • Cucumis sativus / virology
  • Gentisates / chemistry
  • Gentisates / metabolism*
  • Glycosides / chemistry
  • Glycosides / metabolism*
  • Ilarvirus / pathogenicity*
  • Lycopersicon esculentum / metabolism*
  • Lycopersicon esculentum / virology
  • Plant Diseases / virology
  • Plant Leaves / metabolism*
  • Plant Leaves / virology
  • Prunus / virology
  • Salicylic Acid / chemistry
  • Salicylic Acid / metabolism
  • Viroids / pathogenicity*


  • Gentisates
  • Glycosides
  • gentisic acid 5-O-xylopyranoside
  • Salicylic Acid
  • 2,5-dihydroxybenzoic acid