Home > Conference materials > Papers > Daily courses of carbon assimilation characteristics in beech leaves exposed to ambient and elevated CO2 concentration
Original title:
Daily courses of carbon assimilation characteristics in beech leaves exposed to ambient and elevated CO2 concentration
Translated title:
Denní chody asimilace uhlíku v listech buku vystaveného přirozené a zvýšené koncentraci CO2
Authors:
Košvancová, Martina ; Kalina, J. ; Urban, Otmar Document type: Papers Conference/Event: MENDELNet 2006 - Contemporary State and Development Trends of Forests in Cultural Landscape, Brno (CZ), 2006-11-22 / 2006-11-24
Year:
2006
Language:
eng Abstract:
[eng][cze] In this study, we estimated the major photosynthetic responses of European beech (Fagus sylvatica L.) seedlings to the impact of elevated carbon dioxide concentration ([CO2]). We focused on the diurnal changes in Rubisco (ribulose-1,5-bisphosphate carboxylase/ oxygenase) enzyme activity. Rubisco catalyses carboxylation of ribulose-1,5-bisphosphate (RuBP), the first step of photosynthetic carbon assimilation, in competition with oxygenation of RuBP that leads to the photorespiratory pathway. Our analysis shows that the short-term exposure to elevated [CO2] doesn’t change the carboxylation properties of Rubisco enzyme. The significant increase in CO2 assimilation rate is thus caused mainly by the suppressed photorespiration.V této studii jsme sledovali změny základních fotosyntetických charakteristik sazenic buku lesního (Fagus sylvatica L.) vystavených zvýšené koncentraci oxidu uhličitého ([CO2]). Zaměřili jsme se na studium denních změn aktivity enzymu Rubisco (ribulóza-1,5-bisfosfát karboxyláza/ oxygenáza), který katalyzuje karboxylaci ribulóza-1,5-bisfosfátu (RuBP), tj. první krok fotosyntetické asimilace uhlíku, v kompetici s jeho oxygenací, která vede k fotorespiraci. Prokázali jsme, že krátkodobé působení zvýšené koncentrace [CO2] nevede ke změnám karboxylačních schopností enzymu Rubisco. Prokazatelný nárůst rychlosti asimilace CO2 je tedy způsoben potlačením fotorespirace.
Keywords:
global change; photosynthesis; Rubisco Project no.: CEZ:AV0Z60870520 (CEP), GD526/03/H036 (CEP), GA522/06/0930 (CEP) Funding provider: GA ČR, GA ČR Host item entry: Proceedings of MENDELNet 2006, ISBN 80-7375-000-7
Institution: Global Change Research Institute AS ČR
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Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0137462