Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditions
Jazyk angličtina Země Anglie, Velká Británie Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
24316065
DOI
10.1016/j.envpol.2013.11.009
PII: S0269-7491(13)00598-8
Knihovny.cz E-zdroje
- Klíčová slova
- DEPS, Diurnal dynamics, European beech, Fluorescence, Photorespiration, Stomatal conductance, Xanthophylls,
- MeSH
- biologické modely MeSH
- buk (rod) fyziologie MeSH
- fotosyntéza fyziologie MeSH
- látky znečišťující vzduch metabolismus MeSH
- listy rostlin fyziologie MeSH
- oxid uhličitý metabolismus MeSH
- počasí * MeSH
- světlo MeSH
- xanthofyly metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- látky znečišťující vzduch MeSH
- oxid uhličitý MeSH
- xanthofyly 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.
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