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2008 | 30 | 2 |
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The activity of antioxidative enzymes in three strawberry cultivars related to salt-stress tolerance

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Effects of salt stress on the time course of stomatal behaviors and the activity of antioxidative enzymes such as catalase (CAT) (EC, ascorbate peroxidase (APX) (EC, and glutathione reductase (GR) (EC. were studied in three strawberry cultivars. The responses of the cultivars ‘Camarosa’, ‘Tioga,’ and ‘Chandler’ were compared when they were irrigated with nutrient solution containing 0, 8.5, 17.0, and 34.0 mM sodium chloride (NaCl) for 30 days. A significant reduction in stomatal conductance (gs) was seen particularly on the 30th day of the salt treatments only in Camarosa, which is parallel to transpiration rate (E). CAT activities decreased in all of the salt treatments only in Tioga, while it remained almost unchanged or slightly increased depending on the period in Camarosa and Chandler. APX activity sharply increased in 17.0 and 8.5-mM NaCl treatments for 30 days in Camarosa and Tioga, respectively, whereas it linearly increased based on the NaCl treatments in Chandler. On the other hand, only Camarosa demonstrated a sharp increase in GR activity induced by salinity applied for 30 days. All the data indicated that control of the stomatal behavior, the higher salt-stress tolerance (LT50) and higher constitutive activity of antioxidant enzymes made Camarosa and Tioga relatively salt-tolerant cultivars.
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  • Bayramic Vocational School, Canakkale Onssekiz Mart University, 17700 Bayramic, Canakkale, Turkey
  • Department of Horticulture, Faculty of Agriculture, Uludag University, 16059 Bursa, Gorukle, Turkey
  • Department of Horticulture, Faculty of Agriculture, Uludag University, 16059 Bursa, Gorukle, Turkey
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