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Öğe Effect of methyl jasmonate application on bioactive contents and agro-morphological properties of strawberry fruits(Univ Life Sciences Lublin, 2020) Gündoğdu, Müttalip; Berk, Selma Kuru; Yıldız, Kenan; Canan, İhsan; Ercişli, Sezai; Tuna, SelmaIn this study, methyl jasmonate were applied to strawberry cultivars, and the pomological and biochemical characteristics of the fruits were investigated. The highest increase in fruit weight was determined in the Honeoye cultivar and it was detected in the application of 0.50 mM MeJa according to the control group. When the organic acid contents of fruits were examined, it was determined that the dominant acid was citric acid and the maximum range (Control: 1.49 g kg(-1); 0.50 mM MeJa: 16.49 g kg(-1)) was in the Seascape cultivar. When the ellagic acid content of the fruits was examined, the highest increase (Control: 13.350 mg 100 g(-1), 0.25 mM MeJa: 22.768 mg 100 g(-1)) was found in the Sweet Ann cultivar. In this study, it was determined that appropriate concentrations of MeJa should be preferred in cultivation of strawberry and these concentrations affected the fruit quality parameters.Öğe Influence of foliar application with gibberellic acid on phenolic and bioactive compounds of strawberry fruits(Springer, 2021) Gündoğdu, Müttalip; Berk, Selma; Yıldız, Kenan; Kaki, Barış; Tuna, Selma; Canan, İhsan; Okatan, VolkanIn present study, effects of foliar GA3 treatments on phenolic compounds, organic acids, vitamin C content and agro-morphological characteristics of 5 strawberry cultivars were investigated. Principle component analysis was also performed to assess the variations in and relationships between bioactive compounds contents of cultivars treated with GA(3). Although they varied depending on cultivars, the highest organic acid contents were generally determined in fruits treated with 50 ppm GA3. Both GA(3) treatments increased vitamin C contents in 'Albion' and 'Aromas' but decreased in 'Seascape' fruits. GA treatment caused significant change in some phenolic compounds content. While 100 ppm GA(3) treatment significantly increased catechin content of 'Albion' and 'Aromas', it decreased catechin content of 'Seascape' fruits. Results of PCA analysis showed that 'Sweet Ann' differ from other cultivars by poor ascorbic and fumaric acid content. 'Albion' and 'Honeoye' differ from other cultivars by high p-coumaric and low ellagic acid contents.Öğe Recovery of Verticillium dahliae from commercially available potato seed lots planted in Turkey and characterization of isolates by vegetative compatibility and aggressiveness(Springer, 2015) Göre, Mehmet Erhan; Şenkal, Belgin Coşge; Berk, Selma Kuru; Onaran, Hüseyin; Altın, Nedim; Ay, Elif; Tuna, Selma; Zencirci, NusretA total of 105 seed samples collected from commercially available potato seed lots in Turkey were assayed for Verticillium dahliae. V. dahliae was successfully isolated from 29 of the 105 seed lots tested. The frequency of infected lots was nearly 28%. Vegetative compatibility of the isolates was assessed through complementation tests using nitrate non-utilizing mutants. Of the 110 isolates obtained, 63 were assigned to VCG4A, 24 to VCG4B, 19 to VCG2A and one to VCG2B, while the three remaining isolates could not be assigned to any of the identified VCGs. All 36 of the isolates tested in the greenhouse on potato cv. 'Russet Burbank' were pathogenic to potato. As a group, AUDPC values were significantly higher (P < 0.05) for VCG4A than for VCG4B and VCG2 isolates. These data suggest that (i) commercial potato seed lots are commonly infected with V. dahliae, and that this is a primary method by which the pathogen can be introduced into production fields; (ii) potato isolates of V. dahliae belong to VCG4A, 4B and 2A and these isolates are widely distributed via seed lots; and (iii) VCG4A and VCG4B are distinct pathotypes of V. dahliae that vary in their aggressiveness to potato. The present study is the first report of natural infections of potato by VCG4A and VCG2A in Turkey.Öğe Role of maturity stages on phenolic compounds and organic acids contents in red currant fruits(Taylor & Francis Inc, 2020) Berk, Selma; Gündoğdu, Müttalip; Tuna, Selma; Taş, AkgülThe aim of this research was to determine the changes in the organic acids and phenolic compounds in fruits of red currant due to maturity. It was harvested two cultivars (Red Lake and Rovada cv.) during four different maturity stages (green color, veraison, pink color, and red color) in red currant orchard in Bolu province. In red currant fruits 12 phenolic compounds (gallic acid, protocatechuic acid, catechin, chlorogenic acid, vanillic acid, syringic acid, p-coumaric acid, ferulic acid, o-coumaric, rutin, phloridzin, and quercetin), 6 organic acids (malic, succinic, citric, fumaric, tartaric, and oxalic acid), and vitamin C were determined depending on maturity. All ripening times were found to be rich in catechin and rutin. It was determined that the contents of vanillic acid, ferulic acid, routine, phloridzin, and quercetin increased with maturation. In the study, the highest organic acids contents were determined at green stages. The content of vitamin C varied depending on the ripening. The results suggest that red currant fruits were richest in organic acids and phenolic compounds in red maturity period.
