Antioxidant protection during ageing and senescence in transgenic tobacco with enhanced activity of cytokinin oxidase/dehydrogenase
2009
Prochazkova, D.,Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky | Wilhelmova, N.,Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky
We studied changes in physiological characteristics of whole leaves and in antioxidant protection of chloroplasts during ageing and senescence of tobacco (cv. Samsun NN) leaves with enhanced cytokinin oxidase/dehydrogenase activity (CKX) or without it (WT). Old leaves of CKX plants maintained higher pigment content and photosystem 2 activity compared to WT leaves of the same age. Chloroplasts of old CKX plants showed better antioxidant capacity represented by higher superoxide dismutase, dehydroascorbate reductase and glutathione reductase activities.
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