Browsing by Author "Uzal, O."

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Accumulation and Distribution of Iron, Zinc and Manganese Ions in Pumpkin (Cucurbita Spp.) and Gourd (Lagenaria Siceraria) Accessions Subjected To Drought Stress
(Cukurova Univ, Fac Agriculture, 2012) Yasar, F.; Uzal, O.; Kose, S.
The aim of this study was to observe the distribution of ions in different organs of pumpkin and gourd accessions commonly grown in Turkey, in order to better assess drought stress-tolerance mechanisms. Seedlings of 38 accessions of pumpkin (Cucurbita spp.) and gourd (Lagenaria siceraria) were cultured in cups containing Hoagland's nutrient solution in a controlled climate chamber. To simulate drought stress, 15% polyethylene glycol (PEG6000), equivalent to -0.60 Mpa of osmotic potential, was added to the nutrient solution. Following its application, the accumulation and distribution of iron (Fe), zinc (Zn), and manganese (Mn) ions in the roots, shoots, and leaves of the seedlings were observed using atomic absorption spectrometry (AAS) flame photometry. Ion accumulation increased in plants subjected to drought stress in comparison to the control plants. The greatest increase occurred in the leaves.
Determination of Antioxidative Enzyme Activities in Callus Culture of the Salt-Tolerant and Salt-Sensitive Watermelon (Citrullus Lanatus (Thunb.) Mansf.) Genotypes Under Salt Stress
(WFL Publisher Ltd., 2013) Yasar, F.; Uzal, O.; Yasar, O.
To investigate the antioxidant defense system, salt stress induced changes in antioxidant enzymes activities were examined in the callus of salttolerant (Diyarbaki{dotless}r and Midyat local genotype), and salt-sensitive (Golden Crown F1 and Crimson Sweet) watermelon (Citrullus lanatus) varieties. On the 6th and 12th days of salt stress, the callus weights were higher in Golden Crown F1 (GCF1) and Crimson Sweet (CRS) than Diyarbaki{dotless}r (DİB) and Midyat (MİD) genotypes. When compared to control, salt treatment decreased significantly callus growth in salt-sensitive GCF1 and CRS, but did not in salt-tolerant DİB and MİD. Salt treatment increased significantly SOD, CAT, GR and APX enzyme activities in all varieties compared to control treatment. On the other hand, the increases were higher in salt-tolerant DİB and MİD than salt-sensitive GCF1 and CRS. These results possibly suggest that the antioxidant enzyme activities play an active role against stress, the tolerance levels against salt stress in callus culture can be utilized as effective criteria in the genotypes of watermelon. The salt-tolerant genotypes exhibited a better protection mechanism response of salt stress by maintaining a higher inherited and induced activity of antioxidant enzymes than the sensitive genotypes.
Determination of Physiological and Biochemical Reactions of Different Pea Varieties and Lines Under Chilling Stress
(Scibulcom Ltd, 2016) Togay, Y.; Yasar, F.; Togay, N.; Yildirim, B.; Uzal, O.
Under field conditions, growth parametres like fresh weight and leaf number, superoxide dismutase (SOD), catalase (CAT), ascorbic peroxidase (APX) enzymes in the antioxidant defence sytems are analysed on 12 lines and two cultivars of pea seedlings which are specified as tolerant against cold. Besides the relationship between the protection mechanisms from abiotic stress conditions (change on the antioxidant enzymes) on the pea plant is tried to be revealed. In terms of macro and microelement accumulation, considering control plants, the effect of low temperature application is not observed in Mn, Mg, Cu microelements. However, approximately ten times decrease is observed on Fe and Zn accumulations. It is also observed that there is not a change on K and Ca accumulation of the plants considering control plants. It is seen that with the low temperature application, there are significant increases on CAT, APX and SOD enzyme activities which are among the antioxidant enzymes of the plants.
Effect of Calcium Applications on Ion Accumulation in Different Organs of Pepper Plant Under Salt Stress
(E D P Sciences, 2020) Yasar, F.; Uzal, O.
The present study was carried out in a climate chamber and water culture of physiology laboratory of Van Yilziincii Ytl University, Faculty of Agriculture, Department of Horticulture. Demre pepper varieties are used in the study of different levels of calcium (Ca) morphological and biochemical effects of pepper plants under salt stress were investigated. The study was carried out in 16/8 hour light / dark photoperiod, 25 C and % 70 humid climate chamber in controlled conditions. In order to determine the biochemical changes occurring in stressed plants, the amount of ions Na, K, Ca, Cl in root, stem and leaves of plants and Ca/Na ratio were determined. The accumulation of Na and Cl ions was found to decrease in root, stem and leaves as the dose of Ca increased. It can be said that increasing doses of Ca applications under salt stress are partially effective in reducing the negative effects of salt.
Effects of Ga3 Hormone Treatments on Ion Uptake and Growth of Pepper Plants Under Cadmium Stress
(Aloki Applied Ecological Research and Forensic inst Ltd, 2017) Uzal, O.; Yasar, F.
The present study was conducted to identify the response of pepper plants under cadmium stress to gibberellic acid (GA(3)) treatments. Plants were exposed to different cadmium chlorine doses (0, 20, 40, 60 ppm) cadmium chloride (CdCl2) and GA(3) (10 ppm) treatments. A resistance scale was used based on symptoms over the leaves and mineral element analyses (K, Cu, Zn, Fe, Mn, Mg and Cd) were performed. Experiments were conducted in hydroponic culture with Demre pepper cultivar under controlled conditions. Present results revealed significant effects of Cd treatments on Cd, Fe, Zn, Cu, Mn, Mg and K concentrations of the plants. Combined treatments of Cd and GA(3) (10 ppm) also increased ion accumulation especially in leaves. It was observed under stress conditions that GA(3) hormone treatments inhibited plant growth to prevent stress, increased ion uptake, well-adjusted ion balance and let the plants avoid from stressors.
Investigation of Micro Element Intake of Potassium (K +) and Salt Stress Applied Pepper Plants
(International Journal of Scientific and Technology Research, 2018) Yasar, F.; Uzal, O.; Yasar, O.
This study was carried out in order to determine whether the element of potassium would be effective in the intake of micronutrients of the papper plants under salt stress. In the study, Demre long pepper type was used as material. The study was carried out in 16/8 hour light / dark photoperiod, 25 0C and 70% humid climate room in controlled conditions. After germinating the seeds planted in the pumice, the seedlings formed in 2 real leaves were cultured in hydroponics. Hoagland nutrient solution was used in culture in hydroponic solution. The current Hoagland solution K+ was calculated as 136 ppm and was used as the control. Other doses were K1 = 116 ppm, K2 = 136ppm, K3 = 156 ppm, K4 = 176 ppm. In addition, 100 mM NaCl salt was applied to the plants. Sampling for measurements and analyzes was performed on the 20th day of salt administration. In these samples, iron (Fe+2), zinc (Zn+2), copper (Cu+2), manganese (Mn+) and magnesium (Mg+) contents were determined from micro nutrients by total plant weight. In the results obtained, K3 = 156 ppm and K4 = 176 ppm doses were effective in salvaging the plant from the detrimental effect of salt. © 2018, International Journal of Scientific and Technology Research. All rights reserved.
Ion Accumulation in Different Organs of Green Bean Genotypes Grown Under Salt Stress
(Czech Academy Agricultural Sciences, 2006) Yasar, F.; Uzal, O.; Tufenkci, S.; Yildiz, K.
Salt-tolerant Gevas Sink 57 (GS57) genotypes and salt-sensitive 4F-89 French variety, previously determined in our preliminary study, were used in the study. The genotype and the variety exposed to 100mM NaCl application developed different mechanisms to be protected against toxic effects of Na+ ion. Salt-sensitive 4F-89 French variety let Na+ accumulate in all organs. On the contrary, salt-tolerant GS57 did not avoid salt and acted selectively among ions; the majority of toxic ion Na+ accumulated in old leaves and shoots and the plants did not transport them into young leaves. K+ accumulation was high in organs in which Na+ concentrations were low, and vice versa; Na+ content was low in young and high in old leaves of GS57, but K+ content was opposite. Ca2+ content in young leaves of GS57 and 4F-89 decreased; still its content was the highest of all examined ions found in young leaves. This indicated that beans can develop different mechanisms to accept and adapt high levels of salt. Storing toxic ion (Na+) in old leaves and having a limited transmission of salt into young leaves serves as a protection from detrimental effects of salt.
Salt Tolerance, Seed Size, Cotyledon Weight and the Relationship of Antioxidant Enzyme Activities in Watermelon
(Cukurova Univ, Fac Agriculture, 2012) Uzal, O.; Ihtiyaroglu, S.; Yasar, F.
In this study, four genotypes (Tunceli, Amasya, Malatya and Urfa), one standard type (Galactica) and one F1 hybrid varieties (Golden Crown) watermelon were used. Watermelon seedlings were grown in water culture using Hoagland nutrient solution in atmosphere-controlled climate chamber. When the plants had developed four to five true leaves, salt treatment was began, and 100 mM NaCl was gradually applied to medium. The purpose of this study was to investigate whether seed size and cotyledon weight may be used as a marker for salt-tolerant. As a result, genotypes with large seeds and cotyledons had higher enzyme activities than ones with smaller seed and cotyledon. Malatya ve Urfa with larger seed and codyledon leaf were less affected by salt damage, probably because they run better antioxidant enzymes. Galactica and Golden Crown F1 with smaller seed and cotyledon were more affected from slat damage, employing at a lower level of enzyme activities.