Changes in contents and antioxidant activity of phenolic compounds during gibberellin-induced development in Vitis vinifera L. ‘Muscat’
2011
Gibberellic acid (GA3) is a plant growth regulator commonly used for increasing the productivity of seedless fruit. However, little is known about the effect of GA3 on phenolic compounds in grapevine. In the present study, the effect of GA3 application on contents and antioxidant activities of phenolic compounds in different tissues of Muscat grapevine (Vitis vinifera L. cv. Muscat) was investigated. An application of 100 mg/L GA3 could successfully induce seedless grape berry, enhance berry size and accelerate the development of berries, resulting in earlier ripening of seedless berry. The contents of total phenolics and total flavonoids, and antioxidant activities in leaf, stem and tendril obviously increased, while these remarkably decreased in berry skin and flesh after GA3 application. In addition, the grapevine leaf, stem, tendril and skin extracts were shown to contain high amounts of phenolics and significant antioxidant activities. Thus, these findings indicate that GA3 application causes different effect on phenolic compounds and antioxidant activities, depending on grapevine tissues.
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