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This study was conducted to determine the effects of three different bud load levels (15 buds, 25 buds and 30 buds m-2) and two different leaf removal (25% and 50% on each vine shoot) treatments on number of bursted bud, midday leaf water potential (?mid), stomatal conductance (gs), total soluble solids (TSS) and titratable acidity (TA) of own-rooted ‘Sultana Seedless’ (Vitis vinifera L.) in 2016 and 2017 vegetation season in Alaşehir, Turkey. Vine spacing was 3.0 to 2.0 m and the vines were cane pruned on Y type trellis system. Leaf removal treatments were performed only once approximately one month before veraison. In this research, berries were sampled separately from upper and lower sides of the cluster. Then values were analyzed separately (P

The research was conducted in Viticultural Research Institute of Manisa located in Aegean Region of Turkey during 2016 and 2017 seasons. The objective of this study was determine the effects of water stress on yield parameters, berry quality, vine growth and physiology for 6 years old ‘Crimson Seedless’ table grape variety. Three different treatments were considered; namely full irrigation (FI), deficit irrigations (DI-65 and DI-35). In FI soil water deficit in the 90 cm within the seven-day intervals was replenished to the field capacity. DI-65 and DI-35 treatments received 65 and 35% of water applied to FI. All irrigation treatments were applied by sub-surface drip irrigation system. Vine water status was monitored through midday leaf water potential while soil moisture was monitored by MobiCheck probe before the irrigations. Results showed that water deficit treatments (DI-35 and DI-65) influenced berry composition positively. At harvest, deficit irrigation treatments had higher TSS, better CIRG index and uniform coloration compared with the FI treatment. When the ?md (midday leaf water potential) values were declined by DI treatments, it was observed that gs (stomatal conductance) values were decreased and stomatal closure occurs. On the other hand, FI treatment had the highest yield value in both two seasons. Therefore, water use is so important for the purpose of obtain higher yields from field grown grapevines under Aegean Region climatic conditions. Although DI-65 treatment received nearly 35% less water compared to the FI treatment, total yield was reduced approximately 9%. Additionally, berry composition (anthocyanin content, total phenolics, flavonoids and antioxidant capacity) values and coloration were found statistically better than the FI plots. Therefore, considering water shortages in dry years deficit irrigation practices -DI-65- can be recommended. © 2020 International Society for Horticultural Science. All rights reserved.

42nd World Congress of Vine and Wine -- JUL 15-19, 2019 -- Geneva, SWITZERLAND, Soltekin, Ramazan Oguzhan/0000-0001-7886-6531, WOS: 000509352700001, This paper describes an investigation on the effects of deficit irrigation treatments on phenolic compounds and physiological activities of Fantasy Seedless table grape variety. Research was conducted in Viticultural Research Institute of Manisa, located in Aegean Region of Turkey, during two consecutive years (2016-2017). Three irrigation treatments were assayed; namely full irrigation (T-F), deficit irrigations (T-35 and T-65). in T-F, soil water deficit in the 90 cm within the one week intervals was completed to the field capacity. T-35 and T-65 treatments received 35% and 65% of water applied to T-F. Sub-surface drip irrigation system was used in the research and soil water content was measured by MobiCheck probe while vine water status was monitored through midday leaf water potential before the irrigations. Results showed that water deficit treatments (T-35 and T-65) affected berry composition particularly individual phenolics [Gallic acid, (+)(-) Catechine, (-)-Epigallocatechin gallate, (-)-Epicatechin gallate, Caftaric acid, Chlorogenic acid, Caffeic acid, p-Coumeric acid, Ferulic acid, Sinapic acid, Trans-Resveratrol, Myricetin, Quercetin hydrate, Kaempferol, Oenin Chloride, Delphinidin Chloride, Cyanidin Chloride, Malvidin Chloride] differently. the highest Catechine content in the samples was obtained from T-65, T-35 and T-F treatments, respectively. Furthermore it was determined that DI treatments did not change the Myricetin and Quercetin hydrate contents in 2017. on the other hand minimum Psi(md) value was observed from the T-35 treatment in both years. Last of all, our findings show a strong relationship between the amount of water and berry composition values especially individual phenolics which are benefical to health.