CHANGES OF CONTENT AND ANTIOXIDANT ACTIVITY OF PHENOLIC COMPOUNDS DURING GIBBERELLIN-INDUCED DEVELOPMENT OF SEEDLESS MUSCAT GRAPEVINES
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 GA3 application on content and antioxidant activity of phenolic compounds in different tissues of Muscat grapevine (Vitis vinifera L. Muscat) was investigated. 100 mg L-1 GA3 application successfully induced seedless grape berries, enhanced berry size and accelerated the development of berries, resulting in earlier ripening of seedless berries. Content of total phenolics and flavonoids, and antioxidant activity of leaves, stem and tendrils increased markedly, while greatly decreasing in berry skins and pulp after GA3 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 GA3 applications cause different effects on phenolic compounds and antioxidant activity, depending on grapevine tissues.
Shu-fen Tian, (2014). CHANGES OF CONTENT AND ANTIOXIDANT ACTIVITY OF PHENOLIC COMPOUNDS DURING GIBBERELLIN-INDUCED DEVELOPMENT OF SEEDLESS MUSCAT GRAPEVINES. Acta Hortic. 1046, 539-548
gibberellic acid, phenolic compounds, antioxidant activity, seedless