Photosynthetica 2007, 45(3):392-399 | DOI: 10.1007/s11099-007-0066-5

Temperature dependences of carbon assimilation processes in four dominant species from mountain grassland ecosystem

O. Urban1,*, A. Ač1,4, J. Kalina2, T. Priwitzer3, M. Šprtová1, V. Špunda2, M. V. Marek1,5
1 Laboratory of Plants Ecological Physiology, Institute of Systems Biology and Ecology, Academy of Sciences of the Czech Republic, Brno, Czech Republic
2 Department of Physics, Faculty of Science, Ostrava University, Ostrava 1, Czech Republic
3 Forest Research Institute, National Forest Centre, Zvolen, Slovakia
4 Agricultural Faculty, University of South Bohemia, České Budějovice, Czech Republic
5 Institute of Physical Biology, University of South Bohemia, Nové Hrady, Czech Republic

Temperature responses of carbon assimilation processes were studied in four dominant species from mountain grassland ecosystem, i.e. Holcus mollis (L.), Hypericum maculatum (Cr.), Festuca rubra (L.), and Nardus stricta (L.), using the gas exchange technique. Leaf temperature (T L) of all species was adjusted within the range 13-30 °C using the Peltier thermoelectric cooler. The temperature responses of metabolic processes were subsequently modelled using the Arrhenius exponential function involving the temperature coefficient Q 10. The expected increase of global temperature led to a significant increase of dark respiration rate (R D; Q 10 = 2.0±0.5), maximum carboxylation rate (V Cmax; Q 10 = 2.2±0.6), and maximum electron transport rate (J max; Q 10 = 1.6±0.4) in dominant species of mountain grassland ecosystems. Contrariwise, the ratio between J max and V Cmax linearly decreased with T L [y = -0.884 T L + 5.24; r 2 = 0.78]. Hence temperature did not control the ratio between intercellular and ambient CO2 concentration, apparent quantum efficiency, and photon-saturated CO2 assimilation rate (P max). P max primarily correlated with maximum stomatal conductance irrespective of T L. Water use efficiency tended to decrease with T L [y = -0.21 T L + 8.1; r 2 = 0.87].

Keywords: ambient and intercellular CO2 concentrations; carboxylation rate; electron transport rate; photosynthesis; quantum efficiency; respiration; stomatal conductance; water use efficiency

Received: October 19, 2006; Accepted: February 26, 2007; Published: September 1, 2007Show citation

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Urban, O., Ač, A., Kalina, J., Priwitzer, T., Šprtová, M., Špunda, V., & Marek, M.V. (2007). Temperature dependences of carbon assimilation processes in four dominant species from mountain grassland ecosystem. Photosynthetica, 45(3), 392-399. doi: 10.1007/s11099-007-0066-5.
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