Research Information System
Applied Fruit Science, vol.67, no.5, 2025 (SCI-Expanded, Scopus)
This study was conducted between 2017 and 2018 in Isparta, Türkiye, with the objective of determining the effects of different summer pruning practices on grape quality characteristics in the ‘Red Globe’ (Vitis vinifera L.) grape variety. The research was set up in a randomized block design with three replications. The study evaluated eight different summer pruning treatments, comprising shoot trimming and leaf removal at varying times. Berry width, berry length, cluster width, cluster length, total soluble solids (TSS) content, pH, titratable acidity (TA), maturity index (MI), berry skin color (L*, a*, b*), total phenolic content, total flavanol, total anthocyanin, and L‑ascorbic acid content were determined in the experiment. The findings of this study demonstrate that different summer pruning practices exert a substantial influence on the examined characteristics. According to the 2‑year average results, the highest berry width (24.18 mm) and berry length (26.11 mm) were observed in the T3 treatment; cluster width (18.74 cm) in the T1 treatment; TSS ratio (16.20%) and MI (29.05%) in the T4 treatment; TA (7.13 g L−1) and total phenolic content (73.84 mg/GaE/g FW) in the T8 treatment; total anthocyanin (373.3 and 360.0 mg/100 g FW) in the T4 and T6 treatments; L‑ascorbic acid (25.48 mg/100 g FW) was obtained in the T3 treatment. Furthermore, the relationships between parameters were visualized using heat maps, principal component analysis, and Pearson’s correlation analysis. The application of correlation analyses revealed robust positive and negative relationships between specific quality components. In this context, the timing and method of summer pruning play a decisive role in improving quality parameters in the ‘Red Globe’ grape variety. In conclusion, it has been determined that the combination of late-season leaf removal and shoot trimming has a positive effect on the accumulation of antioxidant compounds and maturity indicators.