Browsing by Author "Uyak, C."

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Ampelographic Description of Local Grape Varieties Grown in Adıyaman Province
(Centenary University, 2017) Doğan, A.; Uyak, C.; İlhan, E.
In order to determine the ampelographic characters of grape cultivars grown in Adıyaman province, this research was carried out during 2014 and 2015. Ampelographic characters of varieties were identified according to “Grape Descriptors” of IBPGR (International Board for Plant Genetic Resources). In the 19 grape varieties grown in Adıyaman province belonging to species of Vitis vinifera L., berry skin colour was identified as ‘green yellow’ in 12 varieties, ‘dark red-black’ in 5 varieties, and ‘red’ in Kırmızı Sofralık and Sorik variety. The varieties had averagely 118.6-291.78 cm² bunch size, 123.09-710.91 g bunch weight, 2.05-6.21 g berry weight, 4.10-7.84 kg yield per vine, 10.5-26.0% soluble solids content and 3.29-4.46 g L-1 titretable acidity. In addition, flower type was ‘hermaphrodite’ in 16 varieties, ‘female with reflexed stamens’ in Zerik, Hönüsü and Bozgolik varieties. © 2017, Centenary University. All rights reserved.
Ampelographic Description of Local Grape Varieties Grown in Hizan (Bitlis) Province
(Centenary University, 2017) Doğan, A.; Uyak, C.; Saday, M.
This study was carried out to determine in according to international norms amphelographic characteristics of 24 local the grape varieties grown in Hizan (Bitlis) province in 2015-2016. Ampelographic characters of these grape cultivars were determined according to Descriptors of Grape norms of IBPGR (International Board for Plant Genetic Resources). Flower type (OIV 151) was identified as ‘hermaphrodite’ in 24 varieties, ‘female with reflexed stamens’ in Siyah Güzane variety. Bunch size (OIV 202) was determined as ‘very small’ in 13 varieties, ‘small’ in 6 varieties, ‘medium’ in 3 varieties and ‘big’ in 2 varieties. Berry skin colour (OIV 225) was ‘dark red violet’ in 13 varieties, ‘green yellow’ in 10 varieties and ‘red’ in Tayfivariety. Varieties had averagely 11-22.40 % soluble solids content (OIV 505) and 2.90-8.91 g/l titretable acidity (OIV 506). © 2017, Centenary University. All rights reserved.
Comparison of Two Different Methods in Determination of Grapevine Leaf Area
(Centenary University, 2018) Doğan, A.; Uyak, C.; Gazioğlu Şensoy, R.İ.; Keskin, N.
Leaves are the basic organs that control many vital mechanisms such as photosynthesis, transpiration and respiration in plants; the species or variety is determined based on them in scientific studies; and the response of the plant to various stress conditions is measured on them. The determination of the surface area of leaves also sheds light on many studies. The present study aimed to compare two different methods for determining leaf area. With the first method used, the leaf area was determined from the pixel-area calculation using pixel values using the image processing program Photoshop CS6. The other method has been tried to determine the leaf area by using the weight-area relation. It was determined that the area found between the two methods varied between-12.93 cm 2 to 9.2 cm 2 on the leaves of 28 different grapevine varieties. By comparing these two methods, leaf area coefficient was determined for each variety. The regression coefficient was found as R 2 = 0.908 (p <0.01) between the area scanned on the computer and then determined by the Adobe Photoshop 6.0 program and the area by the weighted relational method. This statistically significant relationship between the two methods shows that the determination of leaf areas by using the weight-area relationship can be used in the condition where it is not possible to determine it by computer. © 2018, Centenary University. All rights reserved.
Determination of Chlorophyll Amounts and Stoma Densities of Grape Cultivars Grown in Hizan (Bitlis) Conditions
(Centenary University, 2020) Doğan, A.; Uyak, C.; Akçay, A.; Keskin, N.; Şensoy, R.İ.G.; Çelik, F.; Özrenk, K.
In order to reveal effects of cultivar, methods used (nail polish and transparented leaf method), picking positions of the leaves (shade / sun) and sampling from different parts of the leaf surface (tip, middle, bottom) on stoma density and sizes and determine total chlorophyll, chlorophyll a, chlorophyll b, carotenoid amounts and SPAD values of the cultivars, this research was carried out on 28 local grape cultivars grown in Hizan province in 2017. In the study, it was determined that the effect of the cultivar, method used and picking position of the leaf on the stoma density was important, but the effect of sampling from different parts of the leaf surface on the stoma density was insignificant. Similarly, it was determined that the effect of the cultivar, method used and on the stoma sizes was important, but the effect of picking position of the leaf and sampling from different parts of the leaf surface on the stoma sizes was insignificant. It was concluded that the transparented leaf method should be preferred in making better stomatal observation in the hairy and rough grapevine leaves. In the study, it was determined that the effect of the cultivar on total chlorophyll, chlorophyll a, chlorophyll b and carotenoid amounts and SPAD values was important and there were important differences between cultivars in terms of these values. It was observed that the SPAD values of the leaves in the sun were higher than the leaves in the shade. © 2020, Centenary University. All rights reserved.
Effects of Different Crop-Load and Ethephon Treatments on Yield, Quality and Biochemical Parameters of Erciş Grape Cultivar
(Centenary University, 2020) Karateke, Ş.; Uyak, C.; Doğan, A.
This study was conducted to investigate the effects of different crop-load and ethephon treatments on yield, quality and biochemical characteristics of Erciş grape cultivar in 2017. Experimental vines were grown on their own roots and trained in gobble style. Following the fruit-set, cluster thinning was performed as to have two different fruit loads (20 and 30 cluster/vine). Ethephon (CEPA 2-Chloroethylphosphonic acid) was sprayed externally only to the clusters in 4 different doses (0-100-500-1000 ppm) twice 7th and 14th days after veraison. Crop loads and ethephon treatments had significant effects on vine yield, cluster width, 100-berry weight, berry length and width, L* and b* values, syringic and p-coumaric acid contents of Erciş grapes. In both crop loads, as compared to the control, ethephon doses generally decreased vine yield, cluster weight, length and width, berry length, width and 100-berry weight, tartaric and malic acid contents, pH and total acidity and increased soluble solid contents. © 2020, Centenary University. All rights reserved.
Effects of Indole-Butyric Acid Doses, Different Rooting Media and Cutting Thicknesses on Rooting Ratios and Root Qualities of 41b, 5 Bb and 420a American Grapevine Rootstocks
(Nobel Science and Research Center, 2016) Doğan, A.; Uyak, C.; Kazankaya, A.
The present study was conducted to investigate the effects of different rooting media [perlite, perlite+sand (1:1), perlite+sand+soil (1:1:1)], different indole butyric acid (IBA) doses (control, 1000, 2000, 3000 and 4000 ppm) and different cutting thicknesses [thin (4-7 mm), medium (8-10 mm) and thick (10-12 mm)] on rooting and root qualities of 41B, 5BB and 420A American grapevine rootstocks adapted to Van region of Turkey. Within the scope of the study, rooting ratios (%), number of roots, root lengths (cm) and root weights (g) were determined. The differences in rooting ratios, number of roots, root lengths and root weights of rootstocks were found to be significant (P < 0.05). Rooting ratios and root quality parameters of cuttings significantly varied with rootstocks, IBA doses, rooting media and cutting thicknesses. With regard to rooting ratios, number of roots and root weights, 5BB rootstock yielded better outcomes than 420A and 41B rootstocks. Compared to control treatment, IBA treatments increased rooting ratio, number of roots, root length and root weight of all three rootstocks. Among the rooting media, the best outcomes for rooting ratio, root length and root weight were obtained from perlite medium and the best results for number of roots were obtained from perlite+sand+soil medium. With regard to cutting thickness, thick cuttings were prominent and they were closely followed by medium ones.