Plant shading increases lipid peroxidation and intensifies senescence-induced changes in photosynthesis and activities of ascorbate peroxidase and glutathione reductase in wheat |
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Authors: | Email author" target="_blank">M?SpundovaEmail author K?Sloukova M?Hunkova J?Naus |
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Institution: | (1) Department of Experimental Physics, Laboratory of Biophysics, Faculty of Sciences, Palacky University, Tr. Svobody 26, 771 46 Olomouc, Czech Republic |
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Abstract: | Plants of spring wheat (Triticum aestivum L. cv. Saxana) were grown during the autumn. Over the growth phase of three leaves (37 d after sowing), some of the plants
were shaded and the plants were grown at 100 (control without shading), 70, and 40 % photosynthetically active radiation.
Over 12 d, chlorophyll (Chl) and total protein (TP) contents, rate of CO2 assimilation (P
N), maximal efficiency of photosystem 2 photochemistry (FV/FP), level of lipid peroxidation, and activities of antioxidative enzymes ascorbate peroxidase (APX) and glutathione reductase
(GR) were followed in the 1st, 2nd, and 3rd leaves (counted according to their emergence). In un-shaded plants, the Chl and TP contents, P
N, and FV/FP decreased during plant ageing. Further, lipid peroxidation increased, while the APX and GR activities related to the fresh
mass (FM) decreased. The APX activity related to the TP content increased in the 3rd leaves. The plant shading accelerated senescence including the increase in lipid peroxidation especially in the 1st leaves and intensified the changes in APX and GR activities. We suggest that in the 2nd and 3rd leaves a degradation of APX was slowed down, which could reflect a tendency to maintain the antioxidant protection in chloroplasts
of these leaves. |
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Keywords: | ageing chlorophyll fluorescence CO2 assimilation plant topography Triticum aestivum |
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