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Permanent URI for this collectionhttps://hdl.handle.net/11452/21452

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The effects of harvesting time on the physicochemical components of aronia berry
(TÜBİTAK, 2020-08-02) Engin, Sevgi Poyraz; Mert, Cevriye; Ziraat Fakültesi; Bahçe Bitkileri Bölümü; AAH-3908-2021; 14054509700
The aim of this work was to compare 'Nero' and 'Viking' aronia cultivars and to determine the optimum harvest dates of each cultivar for various utilizations. For this purpose, we characterized the changes in both aronia cultivars' physicochemical components over their harvest period and identified the correlations between them. Mean berry weight, dry matter, soluble solid content, antioxidant activity, and anthocyanin content of berries of both cultivars increased until the second and third weeks of September. They then began decreasing gradually, whereas total phenol content and condensed tannins kept increasing until 27 October. It was observed that berries of 'Nero' ripened 15 days earlier than those of 'Viking'. As a result, anthocyanin content of 'Nero' peaked earlier (25 August) than that of 'Viking'. The highest correlation (r = 0.75, P < 0.01) was found between anthocyanin and firmness; antioxidant activity was slightly correlated with total phenol content (r = 0.57, P < 0.01) and total anthocyanin (r = 0.49, P < 0.05). In terms of yield, the optimum harvest time for both cultivars was found to be the second week of September. Taking also into account the anthocyanin content, antioxidant capacity, and total phenol, the optimum harvest time was determined to be during the second and third weeks of September. On the other hand, the optimum harvest time for dry consumption was found to be during the first and second weeks of October.
Effects of high temperature stress on enzymatic and nonenzymatic antioxidants and proteins in strawberry plants
(TÜBİTAK, 2016-12-03) Ergin, Sergül; Gülen, Hatice; Kesici, Müge; Turhan, Ece; Köksal, Nezihe; İpek, Ahmet; Ziraat Fakültesi; Bahçe Bitkileri Bölümü; 6603912487
The mechanism of tolerance to high temperatures was investigated in two strawberry (Fragaria x ananassa Duch) cultivars, 'Redlands Hope' ('R. Hope', heat tolerant) and 'Cal. Giant 3' ('CG3', heat sensitive). Leaves were collected from plants that were exposed to gradual heat stress and heat-shock stress separately. The contents of nonenzymatic antioxidants such as ascorbic acid (AsA) and glutathione (GSH) and the activities of enzymatic antioxidants such as ascorbate peroxidase (APX) (EC 1.11.1.11), catalase (CAT) (EC 1.11.1.6), and glutathione reductase (GR) (EC. 1.6.4.2) were measured followed by heat treatments. Additionally, proline content was determined, and heat shock proteins (HSPs) were analyzed with an immunoblotting method to investigate protein markers involved in the heat-stress tolerance of strawberry plants. The contents of AsA and GSH did not change depending on heat stress type, temperatures, or cultivars. While APX and CAT activities increased with high temperatures, GR activity was almost unchanged. The proline content of the cultivars increased in both treatments. Anti-HSP60 immunoblots revealed that a 23 kDa polypeptide was detected during the heat acclimation of strawberry cultivars. The intensity of the heat shock protein in 'R. Hope' plants was more than in 'CG3' plants. Thus, the accumulation of 23 kDa heat shock protein was correlated with the heat tolerance of the cultivars. In conclusion, strawberry leaf tissues of 'R. Hope' were found to enhance the structural stability of cellular membranes under high temperature by increasing both the activity of such enzymes as CAT and APX to activate the antioxidative systems and the expression of 23 kDa HSP.
Genetic variation within the purple carrot population grown in Eregli District in Turkey
(TÜBİTAK, 2016-03-17) Türkmen, Önder; Fidan, Sali; Karcı, Harun; İpek, Ahmet; İpek, Meryem; Ziraat Fakültesi; Bahçe Bitkileri Bölümü; AAH-3233-2021; 6603912487; 16031208900
Although the majority of carrots grown in Turkey and around the world are orange, the production of anthocyanin-containing purple carrots has recently increased in Turkey due to the extraction of anthocyanin from these carrots for use as a natural food colorant. Purple carrot production for this purpose is concentrated in Eregli District in Konya Province, and open-pollinated local purple carrot cultivars or landraces have been used for this production. Genetic variation within the local purple carrot populations in this region is of interest to plant breeders worldwide for the development of new purple carrot cultivars. Therefore, in this study, genetic variation within the purple carrot population grown in Eregli District was assessed using SSR markers. Purple carrot samples were collected by visiting 14 purple carrot growing fields in this region. A total of 20 SSR markers were used. Two SSR markers were monomorphic and the remaining 18 SSR markers amplified 106 SSR alleles. The number of polymorphic alleles per SSR marker ranged from 1 to 14. The polymorphism information content varied from 0.29 to 0.85, and the expected heterozygosity ranged from 0.32 to 0.87. STRUCTURE analysis indicated the presence of two distinct populations within the purple carrot genotypes used in carrot production in Eregli District. The genetic similarity of the genotypes ranged from 0.20 to 0.70. These results indicate that the genetic variation within these carrot populations in Eregli District is high, and the purple carrot populations in this region are valuable genetic resources for the development of new purple carrot cultivars.
Physical and chemical properties of Pekmez (Molasses) produced with different grape cultivars
(Ankara Üniversitesi, 2015-04-13) Türkben, Cihat; Suna, Senem; İzli, Gökçen; Uylaşer, Vildan; Demir, Cevdet; Ziraat Fakültesi; Bahçe Bitkileri Bölümü; 0000-0003-1508-0181; 0000-0002-6637-7666; 0000-0002-6947-2167; 0000-0002-9381-0410; AFR-1890-2022; AAR-2849-2020; AAG-8410-2021; AAQ-8178-2020; ABA-2005-2020; 6506365712; 55512747500; 57190170051; 8228159700; 7003565902
In this study, some physical and chemical properties of pekmez samples produced using the traditional method with fourteen different grape cultivars were investigated. The water-soluble dry matter, pH, titratable acidity and hydroxymethylfurfural (HMF) content of the samples were determined to be 66.19-80.57%, 3.59-5.23, 0.27-1.81 g 100 g(-1) and 5.93-762.22 mg kg(-1), respectively. The mean fructose and glucose contents of the pekmez samples were determined to be 28.42 g 100 g(-1) and 31.67 g 100 g(-1), respectively. The densities and electrical conductivities varied between 1.33-1.43 g cm(-3) and 1.96-4.51 mS cm(-1), respectively. The content of the macro element K identified in the pekmez samples (4449.86 mg kg(-1)) was greater than that of Ca (1275.52 mg kg(-1)), P (369.96 mg kg(-1)), Mg (344.79 mg kg(-1)) and Na (119.56 mg kg(-1)). The pekmez samples have antioxidant activities, ranging between 38.20 to 64.45 mu mol TE g(-1). Six phenolic compounds, caffeic acid, ellagic acid, ferulic acid, gallic acid, p-coumaric acid and rutin hydrate, were identified in the pekmez samples, and significant differences were observed between samples (P<0.01).

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