Onset of photosynthesis in spring speeds up monoterpene synthesis and leads to emission bursts
| Autor: | Albert Porcar-Castell, Jaana Bäck, Toivo Pohja, Pertti Hari, Jon Atherton, Eero Nikinmaa, Juho Aalto, Pasi Kolari, Tuukka Petäjä |
|---|---|
| Přispěvatelé: | Department of Physics, Department of Forest Sciences, Eero Nikinmaa / Principal Investigator, Ecosystem processes (INAR Forest Sciences), Viikki Plant Science Centre (ViPS), Micrometeorology and biogeochemical cycles, Forest Ecology and Management |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Chlorophyll
BVOC CHLOROPHYLL FLUORESCENCE 1171 Geosciences SESQUITERPENE EMISSIONS Physiology SEASONAL-VARIATION 116 Chemical sciences Plant Science VOC EMISSIONS hybrid algorithm VOLATILE ORGANIC-COMPOUNDS Photosynthesis Atmospheric sciences 114 Physical sciences BOREAL FOREST monoterpene emission Botany medicine FEEDBACK MECHANISM SCOTS PINE Chlorophyll fluorescence 1172 Environmental sciences 4112 Forestry ISOPRENE EMISSION biology spring recovery Temperature Scots pine Pinus sylvestris Original Articles Carbon Dioxide 15. Life on land Evergreen Seasonality biology.organism_classification medicine.disease Boreal SUSTAINED ENERGY-DISSIPATION 13. Climate action Photosynthetic acclimation Atmospheric chemistry Monoterpenes Environmental science Original Article Seasons |
| Zdroj: | Plant, Cell & Environment |
| Popis: | Emissions of biogenic volatile organic compounds (BVOC) by boreal evergreen trees have strong seasonality, with low emission rates during photosynthetically inactive winter and increasing rates towards summer. Yet, the regulation of this seasonality remains unclear. We measured in situ monoterpene emissions from Scots pine shoots during several spring periods and analysed their dynamics in connection with the spring recovery of photosynthesis. We found high emission peaks caused by enhanced monoterpene synthesis consistently during every spring period (monoterpene emission bursts, MEB). The timing of the MEBs varied relatively little between the spring periods. The timing of the MEBs showed good agreement with the photosynthetic spring recovery, which was studied with simultaneous measurements of chlorophyll fluorescence, CO 2 exchange and a simple, temperature history‐based proxy for state of photosynthetic acclimation, S. We conclude that the MEBs were related to the early stages of photosynthetic recovery, when the efficiency of photosynthetic carbon reactions is still low whereas the light harvesting machinery actively absorbs light energy. This suggests that the MEBs may serve a protective functional role for the foliage during this critical transitory state and that these high emission peaks may contribute to atmospheric chemistry in the boreal forest in springtime. Emissions of biogenic volatile organic compounds (BVOC) by boreal evergreen trees have strong seasonality. We measured high emission peaks from Scots pine shoots caused by enhanced monoterpene synthesis taking place simultaneously with the photosynthetic spring recovery. We conclude that the increased emissions were related to the photosynthetic recovery, when the efficiency of photosynthetic carbon reactions is low whereas the light harvesting machinery actively absorbs light energy. Increased emissions may serve a protective functional role for the foliage during the transitory state, and these high emission peaks may contribute to atmospheric chemistry in the boreal forest in springtime. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|