Changes in the phytoalexin content of various Vitis spp. in response to ultraviolet C elicitation.
The phytoalexin production potential of three American Vitis species and that of three cultivars of Vitis vinifera were evaluated in response to UV-C irradiation. Time course changes in resveratrol, piceid, epsilon-viniferin, and pterostilbene contents were studied within 3 days after a short UV-C irradiation. Results show that the two major stilbenes accumulated as a response to UV-C elicitation are resveratrol and epsilon-viniferin, a resveratrol dehydrodimer, the concentration of both compounds usually reaching quantities >100 microgram/g of fresh weight. In contrast, piceid and pterostilbene were constantly produced in low quantities. Owing to the results obtained, the role of stilbene phytoalexins in the resistance of grapevines to diseases is discussed.
Douillet-Breuil
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AC
Laboratoire des Sciences de la Vigne, Institut Universitaire de la Vigne et du Vin, Université de Bourgogne, B.P. 27-877, 21078 Dijon Cedex, France. acbreuil@france-mail.com
Jeandet
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P
Adrian
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Bessis
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D010936:Plant Extracts / Q000032:analysis* / Q000096:biosynthesis / Q000528:radiation effects*; D019685:Rosales / Q000737:chemistry / Q000528:radiation effects*; D012717:Sesquiterpenes; D013729:Terpenes / Q000032:analysis* / Q000528:radiation effects*; D013997:Time Factors; D014466:Ultraviolet Rays; D000094162:Phytoalexins
D010936:Plant Extracts; D012717:Sesquiterpenes; D013729:Terpenes; D000094162:Phytoalexins