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Öğe Bitkilerde Hücre Duvarı Mekanizmasında Strese Bağlı Meydana Gelen Savunma Cevapları(2021) Çetinkaya, Hatice; Seçkin Dinler, BurcuBu derlemede, bitki hücre duvarının yapısı, bileşenleri ve çeşitli biyotik ve abiyotik stres faktörlerine bağlı olarak verdiği yanıtlara değinilmektedir. Hücre duvarı streslere karşı bitki direncinin önemli fiziksel bariyer oluşturarak koruyucu rolü üstlenmektedir. Bunun yanı sıra savunma sisteminde sinyal mekanizmasını oluşturmaktadır. Stresin hücre duvarı metabolizması üzerindeki etkileri, hücre duvarı proteinleri ve enzim faaliyetleri üzerine olmaktadır. Stres faktörlerine karşı duvar mekanizması stres kaynağı ve bitki özelliklerine göre değişim göstermektedir. Bununla birlikte, çoğu durumda, iki ana mekanizma vurgulanabilir: (i) ksiloglukan endotransglukosilaz/ hidrolaz (XTH) düzeyinin artması ve (ii) artan hücre duvarı kalınlaşması, ikincil duvarın hemiselüloz ve lignin birikimi ile güçlendirilmesidir. Bu bilgiler ışığı altında, stres koşullarında biyokütle üretimini arttırabilmek için, hücre duvarı üzerindeki stresin sonuçlarını ortaya çıkarmak amacıyla yeni yaklaşımlar ve farklı hücre duvarı analizleri yapılması hedeflenmektedir. Ayrıca hücre duvarı yapısında etkili olan proteinler ile ilgili ileri düzeyde araştırmalar yapılmasının gerekli olduğu kanısındayız.Öğe Changes in Physiological Parameters and Some Antioxidant Enzymes Activities of Soybean (Glycine max L. Merr.) Leaves Under Cadmium and Salt Stress(Journal of Stress Physiology & Biochemistry, 2012) Aksoy, Merve; Seçkin Dinler, BurcuThe combined effect of cadmium stress (0,5 mM Cd(NO3)2) and salt stress (100 mM NaCl) on growth, lipid peroxidation and activities of some antioxidant enzymes were studied in soybean (Glycine max L. Merr.) leaves. Shoot lenghts were not changed under all groups. But fresh and dry weight were decreased under salt treatment alone and Cd treatment alone. The decrease was more in the group of combined of Cd and salt treatment. Although APX activity increased under salt treatment alone and combined of Cd and salt treatment, GR activity increased under Cd treatment alone and combined of Cd and salt treatment. Nevertheless DHAR activity increased only in combined of Cd and salt stress. MDA content increased under all groups but it was more in the combined of Cd and salt stress which indicates that salinity is more harmful with cadmium stress in soybean plants. Thus, it was concluded that some of antioxidant enzymes (APX, GR, DHAR) increased their activity under combined of Cd and salt treatment but they were not efficient to protect oxidative damage from soybean plants by alleviating the lipid peroxidation.Öğe Differential Response of Bean (Phaseolus vulgaris L.) Roots and Leaves to Salinity in Soil and Hydroponic Culture(Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2014) Bayram, Duygu; Seçkin Dinler, Burcu; Taşçı, EdaThe present study aimed to investigate the response of common bean (Phaseolus vulgaris L. Volare) roots and leaves to salinity in different growth mediums (soil and hydroponic culture) through physiologic and biochemical analyses. The relative water content (RWC) and total chlorophyll (CHL) content decreased with 300 mM NaCl treatment in both cultures but did not change with 150 mM treatment in soil culture. Similarly, the malondialdehyde (MDA) content did not change with 150 mM treatment in soil culture, whereas it increased in all other treatments. The highest increase in hydrogen peroxide (H2O2) content was observed with 300 mM treatment in hydroponic culture. The highest increase in superoxide dismutase (SOD) activity was observed in plant leaves in the hydroponic culture. Catalase (CAT) activity did not change with 150 mM treatment in soil culture but decreased with 300 mM treatment in both cultures. Ascorbate peroxidase (APX) activity decreased in all treatments, except in the roots in the hydroponic culture. The Na+ and Cl- contents were higher in the hydroponic culture than in the soil culture. Salt stress induced more serious oxidative damage in the hydroponic culture compared to the soil culture.Öğe Drought tolerance of knotgrass (Polygonum maritimum L.) leaves under different drought treatments(Pakistan Journal of Botany, 2014) Seçkin Dinler, Burcu; Aksoy, MerveDrought stress is a major environmental stress factor for plants causing significant adverse effects on crop growth and yield. Therefore, plant resistance against drought should be determined for wild plants to alleviate such impacts. Knotgrass (Polygonum maritimum L.) is a wild plant getting rarer every day in sandy coasts. The present study was consulted to determine the responses of knotgrass (Polygonum maritimum L.) to drought stress during vegetative growth stages. Plants were drought-stressed by withholding water for (72 hours) and (10 days). Relative water content did not change under drought stress, but the chlorophyll content decreased in both drought treatments. Although, superoxide dismutase (SOD) and catalase (CAT) activity increased more in 10 days drought treatment than 72 hours treatment, ascorbate peroxidase (APX) and glutathione reductase (GR) activity of the treatments were not significantly different. Moreover, both malondialdehyde (MDA) and hydrogen peroxide (H2O2) contents did not change under drought treatments. Such findings indicated Polygonum maritimum as a tolerant species to drought stress during vegetative growth stages.Öğe Guano-Induced Germination and Responses of Wheat Se edlings to Guano Under Water Stress Treatments(Süleyman Demirel Üniversitesi Ziraat Fakültesi Dergisi, 2013) Taşçı, Eda; Seçkin Dinler, BurcuThe present study was conducted to investigate the effects of guano (organic fertilizer) on germination and growth parameters of wheat (Triticum durum L. Karakılcık). Guano was applied into germination medium at a rate of 6g /100 ml - for 3 days. Following the germination of seeds, one group was water stressed by applying a water deficit for 7 days and the other group was irrigated ordinarily. The germination rate and the dry weights of germinated seeds were higher in guano-applied group. In vegetative stage, guano treatments improved relative water content (RWC) and relative growth rate (RGR) under water stress. Water stress increased malondialdehyde (MDA) and hydrogen peroxide (H2O2) content but both parameters did not significantly change in combined water stress and guano treatments. At the seedling stage, ABA (abscisic acid) content decreased in guano group and under water stress but guano treatment increased ABA contents under water stress. It was concluded herein that guano treatments improved germination and growth parameters of wheat seeds and protected the wheat seedlings from oxidative da mages under water stress.Öğe The Effect of Pre-Applied Titanium Dioxide Nanoparticles on Germination in Carthamus tinctorius L. Varieties(2024) Gül, Volkan; Seçkin Dinler, Burcu; Sefaoğlu, Fırat; Çetinkaya, Hatice; Koç, Fatma NurIn the present study, to promote sustainable nano-farming, the apparent effects of different concentrations (0, 100, 200, 300, 400, 500 ppm) of titanium dioxide nanoparticle (TiO2NPs) solutions on the germination percentage, index and duration of seeds belonging to Balcı, Dincer, Hasankendi, Koc, Olas, and Zirkon safflower varieties were investigated. Moreover, scanning electron microscopy (SEM) was employed to analyze TiO2NPs in germinated safflower varieties. Germination performance was TiO2NPs concentration and variety depended. It was determined that the seed samples displayed different responses to TiO2NPs concentrations; germination percentages were between 20.0±1.15 and 82.9±0.44%, germination durations were between 2.01±0.021 to 3.82±0.017 days, and germination indices were between 9.97±0.606 and 38.97±0.959. While the highest germination percentage (82.9±0.44%) was obtained from Dincer variety with 100 ppm TiO2NP pre-application, the lowest germination percentage (20.0±1.15% and 20.0±1.92%) was obtained from Balcı and Hasan Kendi varieties with 100 and 300 ppm TiO2NP pre-application. According to this result, although the highest germination percentage based on variety was obtained from the Dincer variety, the Balcı variety with the lowest germination percentage provided the most significant increase in the 200 ppm TiO2NPs application dose compared to the control. According to the germination percentage, it can be said that the most effective TiO2NPs application dose in Safflower varieties is 200 ppm. Further research on nanoparticles is needed to determine both the economical doses of TiO2NP pre-application and its uptake by the plant.Öğe The Responses of Ascorbate - Glutathione Cycle Enzymes in Seedlings of Pancratium maritimum L. under Drought Treatments(Journal of Stress Physiology & Biochemistry, 2013) Seçkin Dinler, Burcu; Aksoy, MerveIn this study, physiological and biochemical responses of (Pancratium maritimum L.), desert plant which is very widespread on coastal sand dunes to drought were determined. Therefore 28 days (d) old plants were drought stressed by withholding water for 5 and 10 days. The changes in relative growth rate (RGR), relative water content (RWC) lipid peroxidation, and ascorbate-glutathione cycle enzymes activity ((ascorbate peroxidase (APX, EC 1.11.1.11), glutathione reductase (GR, EC 1.6.4.2) dehydroascorbate reductase (DHAR, EC 1.8.5.1) and monodehydroascorbate reductase (MDAR, EC 1.6.5.4)) were investigated. Relative growth rate, relative water content were both decreased on the 5 and 10d of stress treatment while it was higher on the 10d. MDA content increased on the 10d while it did not change on the 5d. On the other hand, activities of APX, GR, DHAR and MDAR increased on the 5d but were not change on the 10d. These results suggest that ascorbate – glutathione cycle enzymes were efficient to prevent from oxidative damage under short term of drought stress in (Pancratium maritimum L.) plants.
