Browsing by Author "Özel, H.B."

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A Comparative Study About Physical Properties of Copper Oxide and Zinc Oxide Nanoparticles on Fagus orientalis L. as Bioindicator
(Springer Nature, 2024) Isinkaralar, K.; Isinkaralar, O.; Özel, H.B.; Şevik, H.
Nanoparticles (NPs) have recently begun to be used extensively in many areas of our lives. It is stated that the resulting NPs pollution will affect even the most remote ecosystems on the Earth. Therefore, determining the effects of NPs on diverse ecosystems is a research topic of interest. From this perspective, current researches on NPs affecting forest ecosystems and forest trees are very scarce. The aim of this investigation was to reveal the inhibitory and toxic properties of CuO and ZnO-NPs on oriental beech seed germination parameters and identify the toxic threshold values of CuO and ZnO-NPs. Therefore, the oriental beech (Fagus orientalis L.) seeds obtained from ten populations (P1 to P10) were treated with CuO and ZnO-NPs as single compounds at concentrations of 200, 400, 600, 800 and 1000 mg/L and germination rate (GR), germination percentage (GP), root collar diameter (RCD), plumula length (PL), radicle thickness (RT) and radicle diameter (RD) were determined for 35 days. The water containing CuO-ZnO NPs as a single compound at 1000 mg/L negatively affected all growth in general. The significant decrease in our study occurred at P9. The CuO-ZnO NPs were reduced in GP, RCD, PL, RT, and RD as 3.5–4.2%; 11.2–0.1%; 9.1–36.4%; 23.07–38.46%; and 39.29–17.86%, while GR enhanced as 21.46–20.09%. It was found that water with a low concentration of NP (200 mg/L) is suitable for irrigation of seeds grown in soil media and does not have a significant toxic effect on the growth and uptake of metal ions. The findings and limitations of the present research allow us to assess the feasibility of reusing NP-contaminated water in agriculture. Nevertheless, further research is needed to understand the toxic effects of NP mixtures on growth and absorption mechanisms.
Altitude-dependent Variations in Some Morphological and Anatomical Features of Anatolian Chestnut
(2024.01.01) Özdikmenli, G.; Yigit, N.; Özel, H.B.; Sevik, H.
Morphological measurements of Anatolian chestnut (Castanea sativa Mili.) Ieaves were done within the borders of Abana district of Kastamonu province. The study was conducted using mixed (oak, beech, hornbeam, black pine, and yellow pine) medium (41% to 70%) and fully closed (71% to 100%) stands. Some leaf parameters, such as leaf blade width, petiole length, leaf blade length, leaf length, distance between lateral veins, teeth width, teeth length, the angle between the leaf base and the petiole, and the angle between the midrib and lateral veins, were measured. Moreover, stomata of the leaves picked up from precise altitudes were observed under a scanning electron microscope. The differences between fibre elevation, fibre wall thickness, elasticity coefficient, rigidity coefficient, Muhlstep rate, and Runkel ratio were found in the wood samples taken from different altitude zones. It was found that altitude did not affect leaf blade width, fibre length, fibre width, felting ratio, and lumen width. However, it was determined that altitude affected other studied characteristics.
Effects of Silver Nanoparticles on Germination and Seedling Characteristics of Oriental Beech (Fagus orientalis) Seeds
(North Carolina State University, 2024) Özel, H.B.; Şevik, H.; Yıldız, Y.; Çobanoğlu, H.
Nowadays, the applications of nanotechnology are increasing in various fields such as information technology, energy, the medical sector, and agriculture. Nanotechnology has proved its ability to solve problems in agriculture and related industries. Establishing the impact of nanoparticles on various ecosystems has become a primary research topic, but studies on forest ecosystems and trees are quite limited. This study examined the effects of silver nanoparticles on the germination parameters of oriental beech seeds and established their toxic threshold values. Silver nanoparticles were applied at concentrations of 200, 400, 600, 800, and 1000 mg/L to oriental beech (Fagus orientalis) seeds collected from 10 different populations in order to identify the germination rate, germination percentage, seedling height, root collar diameter, plumula length, radicle thickness, and radicle length parameters. The results revealed that silver nanoparticles have a negative effect on germination and seedling parameters of oriental beech seeds, and that this effect is clearly seen in the germination rate at 20 mg/L levels and in seedling characters starting from 60 mg/L dose, causing a decrease of 13% in germination rate, 24% in germination percentage, 40% in plumula length, and 30% in radicle length. The Kahramanmaras-Andirin population was found to be the most affected by nanoparticles, while the Bursa-Inegol and Ordu-Akkus populations were the least affected
Phytoremediation and Long-term Metal Uptake Monitoring of Silver, Selenium, Antimony, and Thallium by Black Pine (Pinus nigra Arnold)
(2024.01.01) Sevik, H.; Yildiz, Y.; Özel, H.B.
The usability of black pine (Pinus nigra Arnold) in both monitoring the changes in the concentrations of silver (Ag), selenium (Se), antimony (Sb), and thallium (TI), and in reducing soil or air pollution was investigated. In the study, annual rings of a Pinus nigra tree, cut in 2023 and identified as 356 years old, were grouped into 10 -year intervals, and then the changes in these heavy metals throughout the process were determined by analysing the concentrations of these elements. Additionally, the relationship of these elements with other elements was also detected in the scope of the study. The study results suggested that Pinus nigra was not a suitable bio-monitor for monitoring the changes in Ag, Se, Sb, and TI concentrations in the soil or air, but it was a highly suitable species for phytoremediation studies aimed at reducing the pollution of these elements. Moreover, it was determined that the relationships of the studied elements with essential nutrients, such as Mg, Ca, P, K, AI, Zn, Ni, and Fe, were not statistically significant and were very weak; whereas they exhibited positive and very strong relationships with elements known to be highly harmful for health such as V, Pb, and As.
Possible Changes of Pinus nigra Distribution Regions in Türkiye with the Impacts of Global Climate Change
(North Carolina State University, 2024) Cantürk, U.; Koç, İ.; Özel, H.B.; Şevik, H.
Global climate change poses significant threats to ecosystems worldwide, particularly impacting long-lived forest tree species such as Pinus nigra. This study assessed the potential shifts in distribution areas for Pinus nigra, an important tree species, one highly vulnerable to global climate change, given its prevalence in continental climates, in Türkiye under different climate scenarios (SSPs 585 and 245). In this study, suitable distribution regions of Pinus nigra were evaluated based on SSPs 585 and SSPs 245 using nine different models. Results indicated potential losses in Pinus nigra distribution areas ranging from 15.0% to 43.5% (SSPs 245) and 19.7% to 48.9% (SSPs 585) by 2100. However, in 2100, new suitable distribution areas are expected to be formed at rates ranging from 13.8% to 32.1% and 15.1% to 34.4% according to the above scenarios. Because most of the newly formed suitable distribution regions are quite far from the areas where the species currently spreads, it seems necessary to provide the migration mechanism needed by the species by humans to prevent population losses in this process.
The oil content and fatty acid composition of Fagus orientalis Lipsky seeds from different populations in Turkiye
(2024) Özel, H.B.; Ayan, S.; Onat, S.M.
Knowledge of the nutrient content of edible seeds of oriental beech (Fagus orientalis Lipsky) as a food resource for rural people, is incomplete and there is a need for studies that will provide this information. The seeds of oriental beech collected from 12 different locations in a primary distribution area of Turkey were investigated for their oil content and fatty acid composition. The fatty acid contents of these 12 different populations were determined by gas chromatography-mass spectrometry (GC/MS) of the fatty acids methyl esters (FAME). The seeds of the various tree populations were found to contain total oil amount ranging from 44.66% to 49.07%, which was primarily composed of oleic, linoleic, palmitic, and gadoleic acids. As the predominant unsaturated fatty acid, there was no difference among the populations in the percentage of oleic acid with the highest percentage of unsaturated fatty acids. As the primary saturated fatty acid, the highest palmitic acid content was determined in the Ordu-Akkus population (13.85%), where the species made the optimal development, while the lowest value was determined in the Kahraman-maras-Andirin population (7.14%), which is an isolated population of the species. In the study of oriental beech populations, palmitic acid was found in the major saturated fatty acids, on the other hand oleic, linoleic, and gadoleic acids were found in major unsaturated fatty acids. This study highlights the potential of oriental beech seeds as a nutrient-rich food source due to their high total fat content.