Changes in the phytoalexin content of various Vitis spp. in response to ultraviolet C elicitation.
Journal of agricultural and food chemistry
confidence
Key findings
Resveratrol and epsilon-viniferin were the major stilbenes accumulated after UV-C, exceeding 100 microgram/g fresh weight; piceid and pterostilbene low.
View source on PubMed (PMID 10552833) ↗
- Sample size
- Six grapevine varieties/species
- Population
- Plant study - three American Vitis species and three cultivars of Vitis vinifera
- Dosing
- Short UV-C irradiation
- Duration
- 3 days post-irradiation
- Route
- UV-C elicitation
- Blinding
- not_reported
- Controls
- none
- Drug class
- polyphenol
Full abstract
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.