Browsing by Author "Sefaoglu, F."

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Effects of titanium dioxide nanoparticles against salt and heat stress in safflower cultivars
(2024.01.01) Dinler, B.S.; Cetinkaya, H.; Koc, F.N.; Gül, V.; Sefaoglu, F.
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.
EVALUATION OF YIELD AND QUALITY CHARACTERISTICS OF OIL SUNFLOWER (Helianthus annuus L.) VARIETIES CULTIVATED IN SEMI-ARID IRRIGATED CONDITIONS IN THE NORTHEAST OF TURKEY
(2023.01.01) Gul, V.; Gidik, B.; Sefaoglu, F.
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
Investigation on the genotype and environmental relationships on yield and its components in sunflower (Helianthus annuus L.) in eastern region of Turkiye
(2023.01.01) Sefaoglu, F.
Since sunflower oil is popular cooking oil around the world, the demand for sunflower oil has been increasing recently. The investigation wsas carried out to study the interaction of diverse cultivars with environmental factors on sunflowers' yield components (Helianthus annuus L.). The seed yield and its components significantly varied depending on the variety and location. The maximum seed yield (3700.5 kg ha(-1)) was recorded from Erzurum region in Bosfora cultivar while the minimum seed yield (3450.8 kg ha(-1)) was obtained from Igdir region in Tunca cultivar. Correspondingly Tunca gave a maximum (1620.0 kg ha(-1)) oil yield in Igdir region and a minimum (1550.6 kg ha(-1)) oil yield in Erzurum region. Correlations among seed yield and plant height, head diameter, 1000-seed weight, hectoliter weight, oil concentration and oil yield also showed differences with regards to statistical significance and value at both locations as per the environmental conditions that influenced the individual traits. The results suggested the selection of suitable genotypes must consider the type of soil, local climate, and environmental conditions, which play an important role in oil concentration and seed yield of sunflower. The identified genotypes with high yield and oil content could be used in a breeding programme for the enhancement of genetic potential in sunflowers.
The Effect of Different Doses of Salt Stress on Germination and Emergence in Cannabis ( Cannabis sativa L.) Seed Treated with Pre-Salicylic Acid
(2024.01.01) Gul, V.; Sefaoglu, F.; Cetinkaya, H.; Dinler, B.S.
It is known that salinity stress, one of the abiotic stress factors, significantly limits the germination, growth, development, and crop yield of plants. Therefore, this study was conducted to evaluate the effects of salinity (control, 50, 100 ve 150 mM) on seed germination and the effect of salicylic acid (control, 0.25, 0.50, 0.75 ve 1.00 mM) on seed germination to improve salt tolerance in cannabis seeds. The physiological characteristics of the plant, such as germination percentage, germination duration, germination index, radicle length, plumule length, wet radicle weight, dry radicle weight, wet plumule weight, and dry plumule weight, were analyzed. Depending on the salinity application dose, it was observed that there was a significant decrease in the germination parameters of cannabis seeds compared to the control. It was observed that salicylic acid treatments under salinity stress positively affected all the characters examined and reduced germination arrest due to increasing concentration levels. Although it is recommended to prepare seeds with 0.5 mM salicylic acid pre-application dose against salt stress of the cannabis plant,it is essential to expand the studies on its transfer to practice. As a result, salicylic acid will provide positive results that can be transferred to practice by increasing the resistance of cannabis plants against salinity, especially in agricultural soils with salt problems, as it will be more sensitive to pests and diseases.