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    Artificial Wounding Effects on cv. 'Cabernet Sauvignon' and cv. 'Merlot'; Cluster Morphology, Maturation and Quality Interaction
    (Springer, 2025) Candar, Serkan; Korkutal, Ilknur; Bahar, Elman; Demirkapi, Ecem Kubra
    This study investigates the effects of artificial leaf wounding on cluster morphology, maturation, and quality of Vitis vinifera L. cultivars 'Cabernet Sauvignon' and 'Merlot' grafted onto SO4 rootstock in a vineyard in Tekirda & gbreve;, T & uuml;rkiye, over two years (2021-2022). Ten wounding treatments, applied 15, 10, and 5 days before harvest, were evaluated using a Randomized Complete Block Design. Key parameters included cluster weight, width, length, gapped and non-gapped volume, berry number, yield, shoot number, total soluble solids (TSS, degrees Brix), pH, total acidity, phenolic compounds, anthocyanins, and tannins. Significant year effects were observed for most cluster traits, with higher values in 2021 for berry number, cluster number, weight, length, and shoot number, while 2022 showed increased cluster width and non-gapped volume. Cultivar-specific differences indicated cv.'Cabernet Sauvignon' generally exhibited higher cluster trait values, except for non-gapped volume. No significant treatment effects were observed on cluster morphology, likely due to vineyard homogeneity. Principal Component Analysis (PCA) highlighted that wounding timing and intensity modulated yield and ripening traits, with late-season treatments (PH1, PH5) enhancing phenolic and anthocyanin content. Hierarchical Cluster Analysis (HCA) confirmed treatment timing influenced ripening and phenolic profiles, with PH5 showing pronounced effects in cv. 'Cabernet Sauvignon'. Late-season wounding, particularly PH1 and PH5, is recommended to enhance grape quality, depending on climatic conditions and vineyard management, offering potential for targeted viticultural strategies to optimize wine quality.
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    Öğe
    Hyperspectral Analysis of Grapevine Water Stress
    (Çanakkale Onsekiz Mart Üniversitesi, 2020-12-29) Özelkan, Emre; Karaman, Muhittin; Candar, Serkan; Özelkan, Ertunga Cem; Örmeci, Cankut
    Viticulture is very sensitive to water stress, which is critical and influenced by all environmental factors, relating to the crop quality and productivity of vineyards. In this study, water stress was examined in veraison and harvest stages for nine different species with spectroradiometric measurements. Leaf water potential (LWP) values from field measurements and original spectra-based (OSB) and continuum removed spectra-based (CRSB) curves were analyzed with correlation and regression analysis to find the highest related wavelengths. The analysis was done for both specific dates of field measurements (i.e. 08.08.2012 and 06.09.2012) and also in aggregate i.e. all measured data. The specific date wavelength-based analysis revealed the “red edge region” as a major water stress indicator. The highest correlated wavelength was found to be 684 nm of CRSB curves with R=0.988. For the aggregate wavelength-based water stress analysis, the “violet and green regions” were identified as the best indicators. The highest correlated wavelength was found to be 410 nm of OSB curves with R=0.820. Furthermore, the Analysis of Variance (ANOVA) testing indicates that the results are significant at relatively high confidence levels. The spectral-based method performed in this study provides fast, flexible, and non-destructive water stress measurements of grapevines when compared to classical methods.