Changes in antioxidative protection in bean cotyledons during natural and continuous irradiation-accelerated senescence
Prochazkova, D.(Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky)E-mail:[email protected] | Wilhelmova, N.(Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky)
We employed continuous irradiation (CL) for induction of premature senescence caused by enhanced producton of reactive oxygen species. As a model plant we used bean (Phaseolus vulgaris cv. Jantar) cotyledons because they have well defined and a quite short life span. Senescence of bean cotyledons induced by CL progressed more rapidly than natural senescence: the life span of CL cotyledons was 13 d compared with 16 d in controls (C). Chl content was significantly lower in 10- and 13-d-old CL plants than in C plants and the change with age was not statistically significant. Activities of all antioxidative enzymes declined either with senescence onset or during whole life span. Activity of antioxidative enzymes , except ascorbate peroxidase, was lower in Cl than in C plants. On the contrary, contents of non-enzymatic antioxidants beta-carotene and ascorbate were higher in Cl plants than in C plants. No significant difference, except in the youngest cotyledons, was observed in glutathione content.
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