Delta-viniferin, a resveratrol dehydrodimer: one of the major stilbenes synthesized by stressed grapevine leaves.
Delta-viniferin is a resveratrol dehydrodimer, an isomer of epsilon-viniferin. This compound has been reported as a molecule produced in vitro by the oxidative dimerization of resveratrol by plant peroxidases or fungal laccases. It was also recently identified in wines and in grape cell cultures. We have now identified this dimer by NMR, high-performance liquid chromatography-diode array detection (HPLC-DAD), and HPLC-mass spectrometry (MS) in grapevine leaves infected by Plasmopara viticola (downy mildew) or UV-C irradiated. Its concentration was higher than that of epsilon-viniferin and constitutes one of the most important phytoalexins derived from resveratrol.
Pezet
Roger
R
Swiss Federal Agricultural Research Station for Plant Production of Changins (RAC-Changins), Route de Duillier, CH-1260 NYON, Switzerland. roger.pezet@rac.admin.ch
Perret
Camille
C
Jean-Denis
Julien Bernard
JB
Tabacchi
Raffaele
R
Gindro
Katia
K
Viret
Olivier
O
D001572:Benzofurans / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D019281:Dimerization; D009682:Magnetic Resonance Spectroscopy; D009868:Oomycetes; D010084:Oxidation-Reduction; D010935:Plant Diseases; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism*; D012118:Resorcinols / Q000032:analysis*; D013267:Stilbenes; D014466:Ultraviolet Rays; D027843:Vitis / Q000737:chemistry / Q000378:metabolism*
D001572:Benzofurans; D012118:Resorcinols; D013267:Stilbenes; C477734:delta-viniferin