Enhancing Skin Color and Phenolic Compounds of Cv. Red Globe Table Grape (V-Vinifera L.) Utilizing of Different Preharvest Treatments

Abstract

Foliar sprayings of grapevines with different plant growth regulators or chemicals were evaluated for determining grape skin color and phenolic compounds content and enhancing table grape quality characteristics of cv. Red Globe in this study. Grape skin color is one of the most important quality factors for table grapes. Sometimes, it can be viewed difficulties in skin coloration of some red table grape cultivars grown in various grape growing regions of the world and poor skin coloration of red table grapes is a frequent trouble that reduces production efficiency. Despite the fact that it is utilized from some canopy management practices; plant growth regulators, chemicals with plant hormones and hormone-like compounds as active ingredients can be recently used for improving anthocyanin accumulation in growing of some table grape cultivars. In current study, nine different preharvest treatments were used for improving quality parameters of cv. Red Globe, including 1aEuroControl (C), 2-300 mg/L Abscisic acid (ABA), 3-300 mg/L Ethephon (Eth), 4-30% Ethanol (EtOH), 5-300 mg/L ABA + 300 mg/L Eth, 6-300 mg/L ABA + 30% EtOH, 7-300 mg/L Eth + 30% EtOH, 8-300 mg/L ABA + 300 mg/L Eth + 30% EtOH and 9aEuroCluster tip cutting (CTC). Although the best results from total phenolic compounds content and total anthocyanin content of cv. Red Globe were obtained in CTC treatment in all preharvest treatments, Eth+ETOH treatment especially gave rise to the best results among the preharvest chemical treatments.