Short-term effect of elevated CO2 concentration and high irradiance on the antioxidant enzymes in bean plants
2006
Lambreva, M. | Christov, K. | Tsonev, T.
The effect of short-term exposure to elevated CO2 concentration and high irradiance on the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX), guaiacol peroxidases (GPX) and catalase (CAT), and on the extent of the lipid peroxidation was studied in Phaseolus vulgaris. Plants were exposed for 4 d (8 h a day) to irradiance of 100 (LI) or 1,000 (HI) micromol/square m/s at ambient (CA, 350 micromol/mol) or elevated (CE, 1,300 micromol/mol) CO2 concentration. Four-day exposure to CE increased the leaf dry mass in HI plants and RuBPC activity and chlorophyll content in LI plants. Total soluble protein content, leaf dry matter and RuBPC activity were higher in HI than in LI plants, although the HI and CE increased the concentrations of malonyldialdehyde and H2O2. Under CA, exposure to HI increased the activity of APX and decreased the total SOD activity. Under CE, HI treatment also activated APX and led to reduction of both SOD and GPX activities. CE considerably reduced the CAT activity at both irradiances.
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