conference schedule and program with abstracts - Horticulture ...

P-23
Changes of contents and antioxidant activities of phenolic compounds during gibberellininduced
development of seedless muscat grapevine
T. Shu-fen*
Tianjin Research Institute of Forestry and Pomology, Tianjin, China
Corresponding author: tianshufen@263.net
Gibberellic acid is a plant growth regulator commonly used for increasing the productivity of
seedless fruit. However, little is known about the effect of gibberellic acid on phenolic
compounds in grapevine. In the present work, the effect of GA 3 application on contents and
antioxidant activities of phenolic compounds in different tissues of Muscat grapevine (Vitis
vinifera L. ’Muscat’) was investigated. 100 mg L -1 GA 3 application could successfully induce
seedless grape berries, enhance berry size, and accelerate the development of berries, resulting in
earlier ripening of the seedless berry. Contents of total phenolics and total flavonoids, and
antioxidant activities in leaf, stem and tentril obviously increased, while remarkably decreased in
berry peel and pulp after GA 3 application. In addition, the grapevine leaf, stem, tendril and peel
extracts were shown to contain high amounts of phenolics and significant antioxidant activities.
Thus, these findings indicate that GA 3 application causes different effects on phenolic
compounds and antioxidant activities, depending on the type of grapevine tissue.
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