Daily Preharvest UV-C Light Maintains the High Stilbenoid Concentration in Grapes.
The fact that it is possible to induce stilbenoid synthesis in grapevine (Vitis vinifera) by UV-C light allows the possibility of stimulating grapevine phytoalexin production to increase disease resistance and immunity, and subsequently to limit the use of pesticides in vineyards. UV-C light was applied daily during three days before the harvesting of table grape variety Crimson seedless to study the accumulation of stilbenoid compounds during ripeness. The E-resveratrol concentration was monitored during daily preharvest UV-C light application and compared with that after a single application. Daily periodic preharvest UV-C light treatment showed a cumulative effect on grape stilbenoids. An 86-fold stilbenoid level increase (sum of E-resveratrol, E-piceatannol, ε-viniferin, E-piceid, isorhapontigenin, ω-viniferin, and Z-piceid) in grapes was achieved. The effects of UV-C light on stilbenoid in grape cane was also addressed for the first time. Stilbenoid oligomers such as hopeaphenol, ampelopsin A, and r-viniferin were quantified in cane samples. Quality grape parameters indicated an acceleration of ripening in UV-C samples.
Instituto de Investigación y Formación Agraria y Pesquera (IFAPA) , Rancho de la Merced, Junta de Andalucía, Ctra. Trebujena, Km 3.2, P.O. Box 589, Jerez de la Frontera 11471, Cádiz, Spain.
Raúl F
RF
Guerrero
Instituto de Investigación y Formación Agraria y Pesquera (IFAPA) , Rancho de la Merced, Junta de Andalucía, Ctra. Trebujena, Km 3.2, P.O. Box 589, Jerez de la Frontera 11471, Cádiz, Spain.
Emma
E
Cantos-Villar
Instituto de Investigación y Formación Agraria y Pesquera (IFAPA) , Rancho de la Merced, Junta de Andalucía, Ctra. Trebujena, Km 3.2, P.O. Box 589, Jerez de la Frontera 11471, Cádiz, Spain.
Belén
B
Puertas
INRA, ISVV, USC 1366 Œnologie, Villenave d'Ornon, France.|Université de Bordeaux, ISVV, EA 4577 Œnologie, Villenave d'Ornon, France.
Tristan
T
Richard
D005638:Fruit / Q000737:chemistry* / Q000254:growth & development / Q000528:radiation effects; D010936:Plant Extracts / Q000032:analysis*; D013267:Stilbenes / Q000032:analysis*; D014466:Ultraviolet Rays; D027843:Vitis / Q000737:chemistry / Q000254:growth & development / Q000528:radiation effects*
D010936:Plant Extracts; D013267:Stilbenes
E-resveratrol; Vitis vinifera; cane; color; elicitor; grape sensory; quality; texture; ε-viniferin