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    Changes in peroxidase activities and soluble proteins in strawberry varieties under salt-stress
    (Springer Heidelberg, 2006) Gulen, H; Turhan, E; Eris, A
    Effects of salt stress on the activity of peroxidase (PRX) isozyme and leaf proteins were studied in the three strawberry varieties, Camarosa, Tioga and Chandler. Plants were watered with modified 1/3 Hoagland nutrient solution containing 0 (control), 8.5, 17.0 and 34.0 mM NaCl for 30 days following 20 days acclimation. PRX activity was assayed in leaf extracts and PRX profiles of control and salt treated plants were performed by native polyacrylamide gel electrophoresis (PAGE). During the salt stress Tioga and Camarosa tolerated the cellular damage with less electrolyte leakage while Chandler exhibited a severe cellular damage with the highest (87.5% in 34.0 mM NaCl treatment) electrolyte leakage. Total soluble protein content was decreased by salinity in Tioga (from 11.35 to 5.86 mg center dot g(-1) DW) and Chandler (from 9.35 to 3.90 mg center dot g(-1) DW) while it was almost unchanged in Camarosa. Salt stress increased total and specific PRX activity as compared with the control in all the varieties. In native PAGE, one basic isoperoxidase band (Rf=0.27) was observed commonly with different band intensity in all the treatments. Therefore, it might be associated with lignification and recovery of cell membrane damage in strawberry plants under salt stress.
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    Öğe
    Changes of micronutrients, dry weight, and chlorophyll contents in strawberry plants under salt stress conditions
    (Taylor & Francis Inc, 2005) Turhan, E; Eris, A
    Various concentrations of NaCl (0, 500, 1000, and 2000 mg/L) were applied to plants of the Camarosa and Tioga strawberry varieties for 10 weeks. At the end of the experiment, it was determined that the leaf dry weight increased especially at 500 and 1000 mg/L NaCl treatments when compared to control treatment. However, salt applications did not change total chlorophyll content. With the salt applications, iron (Fe) and manganese (Mn) content increased, while copper (Cu) content did not change in the aerial part of plants in both varieties. On the other hand, zinc (Zn) content increased in the Tioga strawberry variety. In the root part of plants, Fe, Zn, Mn and contents did Dot change according to salt applications in both strawberry varieties. However, 2000 mg/L NaCl of salt applications increased Cu content in the Camarosa strawberry variety significantly.
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    Öğe
    Effects of sodium chloride applications and different growth media on ionic composition in strawberry plant
    (Taylor & Francis Inc, 2004) Turhan, E; Eris, A
    The effects of salt (NaCl) applications of various concentrations (0, 500, 1000, and 2000 mg/L) for 10 weeks (69 days) on the morphologic properties and ionic composition of the Camarosa strawberry variety grown in perlite and perlite: zeolite (1:1) media were investigated. Injuries of varying severity appeared in the plants depending on the increase of NaCl concentration. At the end of the salt applications, in the aerial part of the plants, the amounts of sodium (Na), chlorine (Cl), calcium (Ca), and magnesium (Mg) had generally increased, while the amount of potassium (K) and phosphorus (P) had decreased. In the roots of the plants, salt applications increased the amount of Na and Cl and decreased the amount of K and Mg; however, they did not change the amount of Ca and P. In addition, in the aerial parts of the plant, the amounts of Ca and Mg were higher in the perlite:zeolite (1:1) medium than in the perlite medium generally. It was observed that in the roots, the amount of K was higher in the perlite medium, whereas the amount of Mg was higher in the perlite: zeolite (1:1) medium. It was determined that 500, 1000, and 2000mg/L NaCl levels caused osmotic effects in the Camarosa strawberry variety. Moreover, they possess the ability to bring about osmotic regulation.