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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Denní chody asimilace uhlíku v listech buku vystaveného přirozené a zvýšené koncentraci CO2
 Košvancová, Martina ; Kalina, J. ; Urban, Otmar
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.
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Krátké periody světelných skvrn jsou při indukci fotosyntézy u smrku ztepilého účinnější
 Košvancová, Martina ; Urban, Otmar
Plants growing in the forest understorey are subjected to both prolonged low diffuse background light and transient lightflecks, which provide high light intensities for a few seconds or minutes.The photosynthetic response to fluctuating irradiances is dependent on the following main features of: 1) photosynthetic induction response to a rise in the irradiance, 2) ability to maintain photosynthetic induction under low-light conditions, which allows a plant to better exploit the next lightfleck, 3) stomatal response to light intensity, and 4) ability to extend the photosynthetic activity into the shade period immediately following a pulse of high light, i.e. post-illumination CO2 fixation. In this study we determined the impact of oscillating irradiance with different times of period on the activation and deactivation of CO2 assimilation processes and light use efficiency during the lightflecks.
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