Browsing by Author "Yasar, O."

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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.
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.