Browsing by Author "Encu, Tarik"

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Cadmium Toxicity Affects Chlorophyll a and B Content, Antioxidant Enzyme Activities and Mineral Nutrient Accumulation in Strawberry
(Soc Biolgia Chile, 2015) Muradoglu, Ferhad; Gundogdu, Muttalip; Ercisli, Sezai; Encu, Tarik; Balta, Fikri; Jaafar, Hawa Z. E.; Zia-Ul-Haq, Muhammad
Background: Cadmium (Cd) is well known as one of the most toxic metals affecting the environment and can severely restrict plant growth and development. In this study, Cd toxicities were studied in strawberry cv. Camarosa using pot experiment. Chlorophyll and malondialdehyde (MDA) contents, catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) activities and mineral nutrient concentrations were investigated in both roots and leaves of strawberry plant after exposure Cd. Results: Cd content in both roots and leaves was increased with the application of increasing concentrations of Cd. We found higher Cd concentration in roots rather than in leaves. Chlorophyll a and b was decreased in leaves but MDA significantly increased under increased Cd concentration treatments in both roots and leaves. SOD and CAT activities was also increased with the increase Cd concentrations. K, Mn and Mg concentrations were found higher in leaves than roots under Cd stress. In general, increased Cd treatments increased K, Mg, Fe, Ca, Cu and Zn concentration in both roots and leaves. Excessive Cd treatments reduced chlorophyll contents, increased antioxidant enzyme activities and changes in plant nutrition concentrations in both roots and leaves. Conclusion: The results presented in this work suggested that Cd treatments have negative effect on chlorophyll content and nearly decreased 30% of plant growth in strawberry. Strawberry roots accumulated higher Cd than leaves. We found that MDA and antioxidant enzyme (CAT, SOD and APX) contents may have considered a good indicator in determining Cd tolerance in strawberry plant.
Influence of Lead Stress on Growth, Antioxidative Enzyme Activities and Ion Change in Root and Leaf of Strawberry
(Parlar Scientific Publications (p S P), 2016) Muradoglu, Ferhad; Encu, Tarik; Gundogdu, Muttalip; Canal, Sibel Boysan
Heavy metals are of widespread occurrence as consequences of human, agricultural and industrial activities. Among heavy metals, lead is a potential pollutant that can accumulate in different tissues organs and thus restrict plant growth. In this study, mechanisms of plant tolerances to lead stress were studied on strawberry (Camarosa cv.) using pot experiment with different Lead Pb(NO3)2 applications ranging from 0 to 80 mg kg-1 using soil culture. The accumulation of Pb2+ and its influence on chlorophyll and malondialdehyde (MDA) contents, activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and ion concentrations were investigated in both root and leaves of strawberry plant. Despite severally decrease in the chlorophyll a and b contents, Pb2+ accumulation, MDA, SOD, and CAT activities were increased with the increase in the Pb2+concentrations both in roots and leaves. However APX activity was shown unsteady increase in roots and leaves. In the roots and leaves macro and micro ion concentrations were shown altered. While micro element concentrations decreased in contrary to macro element concentrations which were increased compare with control. These results indicate that lead stress cause reduction on growth and oxidative damage as shown by the decline in chlorophyll, increase in lipid peroxidase and antioxidant enzyme and alter levels of macro-micro ion concentrations.