Grape Growth, Anthocyanin and Phenolic Compounds Content of Early Ripening Cv. Cardinal Table Grape (V-vinifera L.) as Affected by Various Doses of Foliar Biostimulant Applications with Gibberellic Acid

Abstract

Uneven skin coloration of early ripening table grapes is characterized by a lack of coloring berries within a cluster and the failure of some berries to develop color even with an uncertain delay of harvest. Biostimulants and plant growth regulators are known to have considerable roles on skin color development in the course of grape maturation. This study was carried out to compare the effects of different biostimulant doses, including 0, 1000, 2000 and 4000 ppm (BSt 0, BSt 1, BSt 2 and BSt 4, respectively) with or without gibberellic acid (GA(3); 20 ppm) on grape characteristics and chemical composition of early ripening cv. Cardinal grape. Study results of cv. Cardinal grape revealed that alone effects of biostimulant doses had more effective on grape characteristics, total anthocyanin content and total phenolic compounds content from phytochemical characteristics. Although different foliar spray applications had varying effects on physical and chemical parameters; BSt 2 application had especially more superior effects on grape growth and phytochemical characteristics of cv. Cardinal grape.