Effects Of UV-C Irradiation On Resveratrol Synthesis In Grape Leaves And The Berries Of Neighboring Clusters

The study focused on ’Beizi’ grape (Vitis ’Beizi’) fruited trees in the field,’Beifeng’ grape (Vitis ’Beifeng’) fruited trees in the pot and ’Beiquan’ grape (Vitis ’Beiquan’) fruited trees in the field to explore the effects of48hours after UV-C irradiation on resveratrol (Res) and its derivatives’ contents in the leaves and different organs of neighboring berry clusters with the method of UV-C irradiation combined with phloem girdling at veraison. The experimental results are as follows:(1) There are only8kinds of trans-Res and its derivatives, which are trans-piceid (trans-PD)、 cis-piceid (cis-PD)、trans-resveratrol (trans-Res)、cis-resveratrol (cis-Res)、trans-ε-viniferin (trans-ε-VIN)、trans-α-viniferin (trans-α-VIN)、trans-resveratrol trimer(trans-RT) and trans-δ-viniferin(trans-δ-VIN), founded in the leaves and fruits of grapes under UV-C irradiation.(2)24or48hours after UV-C irradiation could significantly increase the content of the trans-Res some of its glycosylation and polymer derivatives of ’Beizi’ grape leaves.24hours after UV-C irradiation, there was no significant differences between the content of trans-PD of all treatments and CK in pericarp, but after48h, the trans-PD content of R treatment was significantly higher than that of CK in pericarp, and cis-PD conten of48hours after R treatment it was very significantly higher than the24hours after R treatment.(3) UV-C irradiation on leaves (abbreviated as UV-C irradiation) could significantly enhance the contents of trans-Res、trans-piceid (trans-PD)、trans-e-viniferin (trans-ε-VIN)、trans-α-viniferin (trans-α-VIN)、trans-resveratrol trirnmer(trans-RT) and trans-δ-viniferin (trans-δ-VIN) in leaves of three kinds of grapes, while girdling treatment alone could not.UV-C irradiation inhibited the accumulation of trans-Res and trans-ε-VIN in ’Beifeng’ and ’Beiquan’ grapes’ phloem of neighboring branches; additional girdling treatment could change the results. UV-C irradiation had no effect on the accumulation of trans-Res and its derivatives in xylem of neighboring branches.UV-C irradiation for grapes’ leaves could promote the accumulation of2kinds of trans-Res and its derivatives in ’Beifeng’ and ’Beizi’ grapes’ berry skins of neighboring fruit clusters, and promote the accumulation of5and2kinds of derivatives of trans-Res in ’Beiquan’ grapes’ pedicel and berry skins of neighboring fruit clusters; additional girdling could offset this effect. For these three kinds of grapes, UV-C irradiation had no effect on the accumulation of trans-Res and its derivatives in berry seeds of neighboring fruit clusters.