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Climate change (elevated CO₂, elevated temperature and moderate drought) triggers the antioxidant enzymes' response of grapevine cv. Tempranillo, avoiding oxidative damage.
- Source :
-
Physiologia plantarum [Physiol Plant] 2012 Feb; Vol. 144 (2), pp. 99-110. Date of Electronic Publication: 2011 Nov 10. - Publication Year :
- 2012
-
Abstract
- Photosynthetic carbon fixation (A(N) ) and photosynthetic electron transport rate (ETR) are affected by different environmental stress factors, such as those associated with climate change. Under stress conditions, it can be generated an electron excess that cannot be consumed, which can react with O₂, producing reactive oxygen species. This work was aimed to evaluate the influence of climate change (elevated CO₂, elevated temperature and moderate drought) on the antioxidant status of grapevine (Vitis vinifera) cv. Tempranillo leaves, from veraison to ripeness. The lowest ratios between electrons generated (ETR) and consumed (A(N) + respiration + photorespiration) were observed in plants treated with elevated CO₂ and elevated temperature. In partially irrigated plants under current ambient conditions, electrons not consumed seemed to be diverted to alternative ways. Oxidative damage to chlorophylls and carotenoids was not observed. However, these plants had increases in thiobarbituric acid reacting substances, an indication of lipid peroxidation. These increases matched well with an early rise of H₂O₂ and antioxidant enzyme activities, superoxide dismutase (EC 1.15.1.1), ascorbate peroxidase (EC 1.11.1.11) and catalase (EC 1.11.1.6). Enzymatic activities were maintained high until ripeness. In conclusion, plants grown under current ambient conditions and moderate drought were less efficient to cope with oxidative damage than well-irrigated plants, and more interestingly, plants grown under moderate drought but treated with elevated CO₂ and elevated temperature were not affected by oxidative damage, mainly because of higher rates of electrons consumed in photosynthetic carbon fixation.<br /> (Copyright © Physiologia Plantarum 2011.)
- Subjects :
- Chlorophyll metabolism
Fluorescence
Hydrogen Peroxide metabolism
Lipid Peroxidation drug effects
Models, Biological
Oxidation-Reduction drug effects
Plant Leaves drug effects
Plant Leaves enzymology
Thiobarbituric Acid Reactive Substances metabolism
Vitis drug effects
Vitis metabolism
Antioxidants metabolism
Carbon Dioxide pharmacology
Climate Change
Droughts
Oxidative Stress drug effects
Temperature
Vitis enzymology
Subjects
Details
- Language :
- English
- ISSN :
- 1399-3054
- Volume :
- 144
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Physiologia plantarum
- Publication Type :
- Academic Journal
- Accession number :
- 21929631
- Full Text :
- https://doi.org/10.1111/j.1399-3054.2011.01524.x