THE EFFECTS OF GA₃, CPPU AND ABA APPLICATIONS ON THE QUALITY OF KYOHO (VITIS VINIFERA L. X LABRUSCA L.) GRAPE

This study was carried out to investigate the effects of GA₃, CPPU (N-(2-chloro-pyridyl)-N’-phenylurea), and ABA on the fruit quality of ‘Kyoho’ (Vitis vinifera L. x V. labrusca L.) grape.
The clusters on 7-year-old ‘Kyoho’ grapevines were soaked into 25 mg/L GA₃, 10 mg/L CPPU, and 1000 mg/L ABA solutions, alone or in combination.
GA₃ and CPPU were applied 10 days after full bloom and ABA at veraison.
GA₃ treatment increased cluster length, weight, and berry weight.
CPPU treatment increased cluster length, diameter, weight and berry weight.
These effects were risen by the combined treatment of GA₃ and CPPU more than GA₃ or CPPU alone.
Total soluble solids and titratable acidity were not significantly different among all treatments.
Anthocyanin content in berry skin was reduced by treatments of GA₃ and CPPU, suggesting their inhibitory role for anthocyanin synthesis.
ABA treatment increased significantly anthocyanin content of grape treated with GA₃ and CPPU. So, it was concluded that the combined treatment of GA₃, CPPU, and ABA was effective for fruit enlargement and coloration.
GA₃ and CPPU treatments did not affect glucose and fructose contents, but ABA increased it a little.

IX International Symposium on Plant Bioregulators in Fruit Production

D.H. Han, C.H. Lee

GA₃, CPPU (N-(2-chloro-pyridyl)-N’-phenylurea), ABA, fruit quality, Kyoho, veraison, anthocyanin

https://doi.org/10.17660/ActaHortic.2004.653.27