Future climate alleviates stress impact on grassland productivity through altered antioxidant capacity

Naudts, K., Van den Berge, J., Farfan, E. , Rose, Peter, AbdElgawad, H., Ceulemans, R., Janssens, I. A., Asard, H. and Nijs, I. (2013) Future climate alleviates stress impact on grassland productivity through altered antioxidant capacity. Environmental and Experimental Botany, 99 . pp. 150-158. ISSN 0098-8472

Full content URL: http://dx.doi.org/10.1016/j.envexpbot.2013.11.003

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Item Type:Article
Item Status:Live Archive


Predicting future ecosystem functioning requires a mechanistic understanding of how plants cope with different stressors under future climate conditions with elevated CO2 concentrations and warmer temperatures. Nonetheless, studies of stress responses under combined elevated CO2 and warming remain scarce.We assembled grassland communities in sunlit, climate-controlled greenhouses and subjected these to three stressors (drought, zinc toxicity, nitrogen limitation) and their combinations. Half of the communities were exposed to ambient climate conditions (current climate) and the other half were continuously kept at 3°C above ambient temperatures and at 620ppm CO2 (future climate).Across all stressors and their combinations, future climate-grown plants coped better with stress, i.e. above-ground biomass production was reduced less in future than in current climate. Among several tested potential biochemical and ecophysiological stress-relief mechanisms, we found three mutually non-exclusive mechanisms underpinning an improved stress protection under future climate conditions: (i) altered sugar metabolism; (ii) up-regulated levels of total antioxidant capacity and polyphenols; and (iii) more efficient use of ascorbate and glutathione as antioxidants. © 2013 Elsevier B.V.

Keywords:Ecology, Antioxidant capacity, Elevated CO2, Grasslands, Plant stress, Productivity, Warming
Subjects:C Biological Sciences > C180 Ecology
D Veterinary Sciences, Agriculture and related subjects > D447 Environmental Conservation
Divisions:College of Science > School of Life Sciences
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ID Code:12881
Deposited On:08 Jan 2014 17:29

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