Browsing by Author "Bitik, Selma Kipcak"

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Changes in Some Seedling Growth Parameters, Nutrient Content and Enzyme Activity in Different Melon (Cucumis Melo L.) Genotypes Under Deficit Irrigation Conditions
(Tarbiat Modares Univ, 2025) Cakmakci, Ozlem; Bitik, Selma Kipcak; Ekincialp, Aytekin; Erdinc, Ceknas; Kabay, Turgay; Eser, Fuat; Sensoy, Suat
Increasing need for drought adaptation measures to conserve water and sustain crop yield in water-scarce regions is driven by severe and recurrent droughts. Achieving sustainable production entails studying deficit irrigation as a means to enhance water productivity and selecting genotypes resilient to soil water deficits. In the present study, 17 different melon (Cucumis melo L.) genotypes collected from the Van Lake Basin and 3 hybrids and 1 standard melon cultivar for control purposes were used for this purpose. The study was carried out under climate room conditions. Two different irrigation levels (I100: 100% full irrigation, I50: 50% Deficit Irrigation-DI) were applied in the study for deficit irrigation. Water applications started with the emergence of the second true leaf of the plants and, after one-month, different growth, nutrient, and enzyme contents of the seedlings were determined. In general, it was determined that deficit water application negatively affected seedling growth, and root dry matter, stomatal opening and density, potassium, APX and SOD enzymes, and MDA content increased, while the other tested parameters decreased. The melon genotypes of the Van Lake Basin were found to vary in response to deficit irrigation treatments.
Influence of Combinations of Chemical and Organic Fertilizers on Biochemical Responses of Tomato Fruits in Different Maturity Stages
(Amer Chemical Soc, 2025) Ekincialp, Aytekin; Bitik, Selma Kipcak; Erdinc, Ceknas; Sensoy, Suat
This study evaluates the impact of organic and conventional fertilizers on the quality attributes of Nergis F1 tomatoes. The fertilizers tested included full-dose vermicompost (VC), organo-mineral fertilizer (OMF, 11:11:11), chemical fertilizer (CF, 20:20:20), and their combinations. Key quality parameters were assessed, including pH, titratable acidity (TA), total soluble solids (TSS), ascorbic acid (AsA), lycopene, beta-carotene, organic acids, phenolic compounds, total antioxidant capacity (TAC), total phenols (TP), respiration rate, and ethylene production. Results showed that the OMF treatment significantly increased TSS at the red maturity stage (8.33 degrees Brix), while the highest TSS value (8.65 degrees Brix) was observed in T1, followed closely by T4. Treatments T10 and T9 also exhibited elevated TSS levels at the red and pink maturity stages, respectively. Additionally, combinations of OMF and VC positively influenced organic acid and phenolic compound concentrations. These findings highlight the potential of organic and organo-mineral fertilizers to enhance tomato quality and support sustainable agricultural practices.
Mitigation Effects of Gamma Ir 1 Radiation (60co) and Trichoderma Species Against Fusarium- and Pythium-Induced Diseases in Cucumber
(Springer, 2025) Gunes, Hasret; Hatipoglu, Murside; Yildiz, Muhsin; Bitik, Selma Kipcak; Erdinc, Ceknas; Demir, Semra
Cucumber (Cucumis sativus L.) is a vegetable widely grown worldwide for its agricultural, economic and nutritional value. With the increase in cucumber cultivation areas in recent years, soil-borne plant disease such as Pythium spp. and Fusarium wilt (FW) have caused significant economic losses for producers. Filamentous Trichoderma fungi and gamma radiation are well known for their ability to stimulate many plant-pathogen fungal interactions, plant defense mechanisms against these fungi (antagonistic, competitive, etc.), and plant growth. This study aims to examine the effects of Trichoderma spp. (Trichoderma harzianum and Trichoderma virens), which are among the sustainable practices against F. oxysporum f. sp. cucumerinum and P. aphanidermatum pathogens, and the effects of gamma rays (0, 50, 100, 150, 200, and 250 Gy), which are used as a reliable method for changing physiological and biochemical processes in plants and investigating their interactions with pathogens. The results revealed that the interaction between gamma rays and Trichoderma species increased the fresh and dry weights and shoot and root length values of the cucumber plants and decreased the disease severity. When Trichoderma harzianum (%51-%78 impact) and Trichoderma virens (%40-%67 impact) were compared, their effects on plant growth and disease severity were determined to vary according to parameters and gamma doses. These results indicate that gamma mutations may improve the biocontrol properties of T. harzianum and T. virens. According to the results of this study, gamma rays can be used in sustainable agricultural practices together with Trichoderma spp. as a bioformulation against pathogens that cause wilt and root rot in cucumber [F. oxysporum f. sp. cucumerinum (72%) and P. aphanidermatum (66%)] against.
Mitigation Effects of Gamma Irradiation (60co) and Trichoderma Species Against Fusarium and Pythium Diseases in Cucumber (Vol 54, Pg 45, 2025)
(Springer, 2025) Gunes, Hasret; Hatipoglu, Murside; Yildiz, Muhsin; Bitik, Selma Kipcak; Erdinc, Ceknas; Demir, Semra
Physiological and Biochemical Ameliorative Effects of Biochar, Trichoderma Harzianum, and Combined Applications in Capsicum Annuum L. Under Water Stress
(Springer, 2026) Bitik, Selma Kipcak; Aydemir, Ozlem Ete; Kocaman, Ayhan; Turan, Metin; Ozkutlu, Faruk
In this study, the ameliorative effect of biochar (B), Trichoderma harzianum (TH) and their combined application (BTH) on plants of Capsicum annuum L. exposed to varying degrees of water deficit was investigated. In control plants exposed to full irrigation (100%) and water restrictions of 75% and 50%, drought stress caused a 20-40% reduction in macro- and micronutrient uptake and a significant increase in oxidative stress indicators (H2O2 and MDA). Under severe water limitation (50%), BTH application increased CAT, POD and SOD activities by more than 40% compared to the control (C50) and reduced H2O2 accumulation by about 25%. However, under moderate or no stress conditions, the SOD activity in the BTH groups was not higher than that of the biochar alone. A significant increase in proline and sucrose accumulation was also observed. At the hormonal level, BTH treatments increased the concentrations of growth-promoting hormones (IAA and GA) by over 1500% and 2900%, respectively, while ABA concentrations decreased by 99.5%. Significant increases of up to 50% were also observed in defense hormones such as SA and jasmonic acid. Principal component analysis (PCA) showed a clear separation of BTH-treated plants from other groups on the basis of growth promotion, antioxidant defense activation, hormonal regulation and osmotic adjustment. Taken together, these results indicate that the combined application of biochar and Trichoderma harzianum significantly improves the physiological and biochemical resistance of Capsicum annuum under water stress conditions and thus represents a promising strategy for sustainable agricultural production.