Research Information System
III International Symposium on Horticulture in Europe- SHE 2016, Chania, Greece, 17 - 21 October 2016, pp.188-88
Abstract
In this research, the effects of two Irrigation regime (IR-1 and IR-2) and bud load (BL) treatments on yield, cluster and berry quality and phenolic compositions of Alphonse Lavallee table grape variety were studied in 2013-2015 years. The midday leaf water potential thresholds were used for irrigation timing, and those values were set as -1 MPa until flowering, -1.3 MPa between fruit set-veraison and veraison-ripening periods, and -1.2 MPa after harvest for both IR treatments. Water volumes applied in irrigations to the IR-1 plots were 50% and 75% of the cumulative evaporation from the Class A Pan between the growth stages berry setting-veraison and veraison-ripening, respectively, while those portions for the IR-2 treatment was vice versa. Both IR treatments and the non-irrigated treatment have been examined for two bud-loads based on mean pruning weight; 1BL) Normal bud load (20 buds for the first 500 g pruning weight and then 10 buds for each additional 500 g), 2BL) Double amount of 1BL.
Grape yield and cluster weight were slightly higher in irrigated and higher bud loaded vines. But, no significant change was detected in berry weight, total soluble solids, acidity and pH.
Pruning weight was greater in the irrigated and 1BL treatments than in those of the rain-fed and 2BL vines.
Total ten anthocyanin compounds were detected in berries. The highest value of total anthocyanin content were obtained from the grapevines grown under rain-fed conditions and followed by the IR-2 treatment.
Related with the non-colored phenolic (NPC) compounds, two flavanols, six phenol acids and four flavonols were identified and quantified in berries. All these compounds were affected from treatments in either year of the study. The level of total NPC has increased by non-irrigated and 2 BL treatments in both years.
Finally, results showed that while maintaining biochemical composition of the berries, grape yield can be increased via sufficient irrigation and higher bud load application.
Keywords: Grape, irrigation, bud load, leaf water potential, quality, phenolic compounds.