Elevated CO2 response of photosynthesis depends on ozone concentration in aspen
| Autor: | Asko Noormets, Anu Sõber, Olevi Kull, David F. Karnosky, Mark E. Kubiske |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Canopy
Health Toxicology and Mutagenesis Toxicology medicine.disease_cause Photosynthesis Interaction Electron Transport chemistry.chemical_compound Ozone Salicaceae Botany medicine Air Pollutants Dose-Response Relationship Drug biology Environmental factor General Medicine Carbon Dioxide biology.organism_classification Pollution Plant Leaves Horticulture Populus chemistry Chlorophyll Photosynthetic acclimation Carbon dioxide |
| Zdroj: | Environmental Pollution. 158:992-999 |
| ISSN: | 0269-7491 |
| DOI: | 10.1016/j.envpol.2009.10.009 |
| Popis: | The effect of elevated CO(2) and O(3) on apparent quantum yield (varphi), maximum photosynthesis (P(max)), carboxylation efficiency (V(cmax)) and electron transport capacity (J(max)) at different canopy locations was studied in two aspen (Populus tremuloides) clones of contrasting O(3) tolerance. Local light climate at every leaf was characterized as fraction of above-canopy photosynthetic photon flux density (%PPFD). Elevated CO(2) alone did not affect varphi or P(max), and increased J(max) in the O(3)-sensitive, but not in the O(3)-tolerant clone. Elevated O(3) decreased leaf chlorophyll content and all photosynthetic parameters, particularly in the lower canopy, and the negative impact of O(3) increased through time. Significant interaction effect, whereby the negative impact of elevated O(3) was exaggerated by elevated CO(2) was seen in Chl, N and J(max), and occurred in both O(3)-tolerant and O(3)-sensitive clones. The clonal differences in the level of CO(2)xO(3) interaction suggest a relationship between photosynthetic acclimation and background O(3) concentration. |
| Databáze: | OpenAIRE |
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