Antioxidants in sun and shade leaves of sour orange trees (Citrus aurantium) after long-term acclimation to elevated CO2 |
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Authors: | Schwanz, P. Kimball, B.A. Idso, S.B. Hendrix, D.L. Polle, A. |
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Abstract: | Antioxidative systems and the contents of pigments, malondialdehyde,soluble protein, and carbohydrate were investigated in sun-and shade-acclimated leaves of sour orange (Citrus aurantium)trees that had been grown for 7.5 years under ambient and elevated(+300 µmol mol1) atmospheric CO2 concentrations.Sunacclimated leaves contained higher ascorbate, glutathioneand soluble carbohydrate contents and higher catalase activitiesthan shade-acclimated leaves. The activities of superoxide dismutases,which belonged to the family of Cu/Zn-isozymes, were similarin sunand shade-acclimated leaves and decreased in responseto enhanced CO2. In shade-acclimated leaves, none of the otherparameters studied was affected by elevated CO2. In sun-acclimatedleaves elevated CO2 caused increases in carbohydrate and ascorbatecontents. There was no evidence for enhanced lipid peroxidationas assessed from the determination of the malondialdehyde contentsunder either conditions. Key words: Ascorbate, catalase, CO2 enrichment, global change, glutathione, superoxide dismutase |
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