Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditions
Language English Country England, Great Britain Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
24316065
DOI
10.1016/j.envpol.2013.11.009
PII: S0269-7491(13)00598-8
Knihovny.cz E-resources
- Keywords
- DEPS, Diurnal dynamics, European beech, Fluorescence, Photorespiration, Stomatal conductance, Xanthophylls,
- MeSH
- Models, Biological MeSH
- Fagus physiology MeSH
- Photosynthesis physiology MeSH
- Air Pollutants metabolism MeSH
- Plant Leaves physiology MeSH
- Carbon Dioxide metabolism MeSH
- Weather * MeSH
- Light MeSH
- Xanthophylls metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Air Pollutants MeSH
- Carbon Dioxide MeSH
- Xanthophylls MeSH
It has been suggested that atmospheric CO2 concentration and frequency of cloud cover will increase in future. It remains unclear, however, how elevated CO2 influences photosynthesis under complex clear versus cloudy sky conditions. Accordingly, diurnal changes in photosynthetic responses among beech trees grown at ambient (AC) and doubled (EC) CO2 concentrations were studied under contrasting sky conditions. EC stimulated the daily sum of fixed CO2 and light use efficiency under clear sky. Meanwhile, both these parameters were reduced under cloudy sky as compared with AC treatment. Reduction in photosynthesis rate under cloudy sky was particularly associated with EC-stimulated, xanthophyll-dependent thermal dissipation of absorbed light energy. Under clear sky, a pronounced afternoon depression of CO2 assimilation rate was found in sun-adapted leaves under EC compared with AC conditions. This was caused in particular by stomata closure mediated by vapour pressure deficit.
References provided by Crossref.org
Barley Genotypes Vary in Stomatal Responsiveness to Light and CO2 Conditions
