Responses of antioxidative systems to drought stress in Pendunculate oak and Maritime pine as modulated by elevated CO{sub 2}
Journal Article
·
· Plant Physiology (Bethesda)
OSTI ID:430933
- Albert-Ludwigs-Universitaet Freiburg (Germany); and others
The aim of the present study was to investigate the effects of an enhanced CO{sub 2} concentration alone or in combination with drought stress on antioxidative systems of a deciduous (oak; Quercus robur) and an evergreen (pine; Pinus pinaster) tree species. The seedlings were grown for one season in a greenhouse in tunnels supplied with 350 or 700 {mu}L L{sup {minus}1} CO{sub 2}. The experiment was repeated in a second year. Antioxidants, protective enzymes, soluble protein, and pigments showed considerable fluctuations in different years. Elevated CO{sub 2}, caused significant reductions in the activities of superoxide dismutases in both oak and pine. The activities of ascorbate peroxidase and catalase were also reduced in most cases. The activities of dehydroascorbate reductase, monodehydroascorbate radical reductase, glutathione reductase, and guaiacol peroxidase were affected little or not at all by elevated CO{sub 2}. When the trees were subjected in drought stress by withholding water, the activities of antioxidative enzymes decreased in leaves of pine and oak grown at ambient CO{sub 2} and increased in plants grown at elevated CO{sub 2} concentrations. The present results suggest that growth in elevated CO{sub 2} might reduce oxidative stress to which leaf tissues are normally exposed and enhance metabolic flexibility to encounter increased stress by increases in antioxidative capacity. 48 refs., 2 figs., 4 tabs.
- OSTI ID:
- 430933
- Journal Information:
- Plant Physiology (Bethesda), Journal Name: Plant Physiology (Bethesda) Journal Issue: 2 Vol. 110; ISSN 0032-0889; ISSN PLPHAY
- Country of Publication:
- United States
- Language:
- English
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