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    COMPARATIVE ANALYSIS OF BIOCHEMICAL CONTENT, ANTIMICROBIAL AND ANTIOXIDANT ACTIVITIES OF HYPERICUM PERFORATUM L. SPECIES IS GROWN IN T?RK?YE
    (Pakistan Botanical Soc, 2023) Gul, Volkan; Cetinkaya, Hatice; Dinler, Burcu Seckin; Sefaoglu, Firat
    Many external factors, such as climatic conditions, geographical differences, and altitude, directly affect the primary and secondary metabolites and therapeutic use of St. John's Wort (Hypericum perforatum L.), an important plant in alternative medicine. This study was carried out to identify the antioxidant and antimicrobial activities and the content of proline, malondialdehyde, hydrogen peroxide, flavonoid, anthocyanin, and total phenolic in the St. John's Wort growing naturally in different regions of Bayburt. The St. John's Wort samples were collected from 11 different locations. As a result of the analyses carried out on the plant samples, it was found that the content of proline was within the range of 4.6-8.2 mu mol g-1 DW, the amount of malondialdehyde was within the range of 0.69-1.10 nmol g-1 DW, the amount of hydrogen peroxide was within the range of 79.89-155.49 mu mol g-1 DW, the amount of flavonoids was within the range of 91.38%100.27%, the amount of anthocyanin was within the range of 0.15-1.11 mkmol g-1 DW, the total phenolic content was within the range of 15.82-45.22 mg GAE g-1, and the antioxidant activity was within the range of 6.07-105.60 mu g mL-1.In conclusion, although the biochemical contents and nonenzymatic antioxidant activities showed a wide variety, the antioxidant activity was found to be higher in samples 5, 8, and 11. According to the antimicrobial activity results, some plant extracts were effective on bacteria and fungi, especially samples 5, 6, 8, and 11 showed an effect at the concentration of 200 mu g mL-1. This study, the first regional study on this subject, will contribute to future research and clinical trials in the health field.
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    Effects of titanium dioxide nanoparticles against salt and heat stress in safflower cultivars
    (Soc Botanica Brasil, 2024) Dinler, Burcu Seckin; Cetinkaya, Hatice; Koc, Fatma Nur; Gul, Volkan; Sefaoglu, Firat
    This study aimed to determine the effects of titanium dioxide nanoparticle (TiO2NP) pretreatment on seeds of different safflower cultivars (Balci, Dincer) under salt and heat stresses. The apparent effects on stress markers (malondialdehyde (MDA), hydrogen peroxide (H2O2) and superoxide radical (O2 center dot-) content), as well as changes in germination and physiological parameters (radicle and plumula weight and length measurements), were investigated. TiO2NP pretreatment caused an increase in radicle length and plumula fresh weight for the Balci cultivar under salinity. Furthermore, plumula dry weight was alleviated with TiO2NP pretreatment for both cultivars. TiO2NP pretreatment improved plumula dry and fresh weights for both cultivars under heat stress. In addition, MDA content decreased for both cultivars under heat stress but only for Balci under salt stress. The amount of O2 center dot- radicals positively affected only the radicle for both cultivars under heat stress. This study is the first to document the alleviation of salt stress damage for the Balci safflower cultivar, and protection for both Balci and Dincer cultivars under heat stress, using 200 ppm TiO2NP pretreatment.
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    EVALUATION OF YIELD AND QUALITY CHARACTERISTICS OF OIL SUNFLOWER (Helianthus annuus L.) VARIETIES CULTIVATED IN SEMI-ARID IRRIGATED CONDITIONS IN THE NORTHEAST OF TURKEY
    (Soc Field Crop Sci, 2023) Gul, Volkan; Gidik, Betul; Sefaoglu, Firat
    Sunflower, an oil plant grown in many parts of the world, is capable of growing in many different climatic conditions. It is of great importance to carry out studies on the adaptation of new varieties and to determine the varieties suitable to the ecology of the region in areas where sunflower cultivation is intense. This study was carried out to determine yield and quality characteristics of some sunflower cultivars (SANBROMR, P63LE113, 11TR077, ESNIEGARA, ADELYA, and DERAY) under Bayburt providence conditions of Turkey in 2020-2021. It has been determined that there are significant differences between the cultivars for the traits examined. The highest average seed yield (4194.2 kg ha-1) and average linoleic acid content (65.09%) were found for BOSFORA. The highest average oil content ESNIEGARA (48.78%) and average oil yield respectively were obtained from ESNIEGARA (186.02 kg ha-1) and BOSFORA (182.93 kg ha-1) varieties and the highest average oleic acid content was obtained from 11TR077 variety (41.78%). The results of this study emphasized the importance of varieties in sunflower growing. BOSFORA and ESNIEGARA varieties had high yield and quality characteristics in the ecologies of a semi-arid climate.
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    Performance of organic manures alone or combined with chemical fertilizers in increasing growth, yield, and nutritional quality of potatoes in the Eastern part of Turkiye
    (Taylor & Francis Inc, 2024) Kurt, Gunes; Ozturk, Erdogan; Sefaoglu, Firat; Gul, Volkan; Toktay, Zehra; Mosber, Goltay
    This study aimed to determine the effects of different types of fertilizers (organic and inorganic fertilizers) on plant growth, yield, and yield components of potatoes grown in the high-altitude plateau of eastern Turkiye in 2017 and 2019. In the experiment, single or combined doses of nitrogen (N; as ammonium sulfate) and phosphorus (P; as triple super phosphate) as inorganic fertilizers and leonardite (L) and vermicompost (V) fertilizers as organic fertilizers were used. In both years, different fertilizer treatments significantly affected plant growth, yield, and yield components. Tuber yield per hill (941.0 g), marketable tuber yield (32.71 t ha(-1)), total tuber yield (37.84 t ha(-1)), specific gravity (1. 077 g cm(-3)), chip productivity (35.9%), starch (13.03%) and protein (11.0%) ratios increased when N fertilizer was used in combination with vermicompost or leonardite. N fertilizer combined with V or L fertilizer increased tuber yield under harsh continental climates, short growth periods, and high altitudes.