ISHS Acta Horticulturae 640: XXVI International Horticultural Congress: Viticulture - Living with Limitations
INFLUENCE OF ABA AND ETHEPHON TREATMENTS ON FRUIT COMPOSITION OF 'TEMPRANILLO' GRAPEVINES |
| Authors: | R. Delgado, J.I. Gallegos, P. Martín, M.R. González |
| Keywords: | Abscisic acid, CIE, color, ethylene, grape quality, Vitis vinifera |
| Abstract:
In cool regions, where heat units are frequently insufficient for grape maturity, it may be appropriate to use growth regulators to accelerate fruit maturity and to enhance the color of musts. The effects of combined treatments of ABA (abscisic acid) and ethephon (2-chloro-ethylphosphonic acid) on fruit composition of ‘Tempranillo’ grapes were examined. The experiment was conducted in Ribera del Duero (Spain) in 2001. ABA and ethephon were applied at veraison (98% berries colored). Vines were sprayed with ABA at 0, 400 and 800 ppm and with ethephon at 0 and 700 ppm. The experimental design was a randomized complete block with four replications. At harvest, production components, total soluble solids (TSS), pH, titratable acidity (TA), total polyphenols, chromatic characteristics of must and skin anthocyanin content were measured. ABA treatment at 400 ppm increased must pH and decreased the colour value, b*, from yellow to blue and decreased the hue, but had no effect on other fruit composition variables. Contrary to previous studies with other cultivars, ethephon application decreased the total soluble solids content of ‘Tempranillo’ grapes at harvest (23.0%) in relation to the control (24.4%), and decreased the TSS:TA ratio. Ethephon also improved the chroma (C*) and the red component of must color (a*). The combined application of 700 ppm of ethephon and 800 ppm of ABA at veraison increased the total polyphenol content of the must up to 16 % in relation to the control. | |
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