مرکز منطقه ای اطلاع رساني علوم و فناوري - Effects of Cluster Thinnings on Yield and Quality Characteristics in Shiraz Grape Cultivar

Abstract :

In this study, effects on biochemical characteristics of berry with yield and quality characteristics of 4 different cluster thinnings (8, 16, 24 and 32 cluster/vine) applied after berry set in Shiraz grape cultivar grown in Güney town of Denizli provience were investigated. Antioxidant activities of grape berries were determined according to DPPH, TEAC and FRAP methods and compared. Highest grape yield were obtained in the application of 32 cluster per vine (5576.70 g vine^-1). While there were statistically any differences among applications with regard to cluster weight, cluster length and cluster width, there were statistically different among applications with regard to berry weight, berry width and berry length. While the highest berry weight was determined in application of 16 cluster per vine (1.62 g), the lowest berry weight was determined in application of 32 cluster per vine (1.51 g). The highest total phenol (285.20 mg GAE 100 g^-1), total flavonoids (100.68 mg CTE 100 g^-1) and total monomeric anthocyanin (3.29 mg g^-1) were obtained in the application of 8 cluster per vine. It was determined that among applications, there were no significant differences in antioxidant activities measured with DPPH and TEAC methods but there were significant differences in antioxidant activities measured with FRAP.