Use of an analytical model to study limitations on net photosynthesis in Arbutus unedo under field conditions |
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Authors: | P C Harley J D Tenhunen O L Lange |
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Institution: | (1) Systems Ecology Research Group, San Diego State University, 92182 San Diego, CA, USA;(2) Lehrstuhl für Botanik II, Universität Würzburg, Mittlerer Dallenbergweg 64, D-8700 Würzburg, Federal Republic of Germany |
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Abstract: | Summary From field gas-exchange measurements on Arbutus unedo growing in Portugal, parameter values necessary to apply an analytical, physiologicallybased model of C
3 photosynthesis were obtained. The model successfully simulated measured diurnal photosynthetic responses in Arbutus during periods without water stress, under both natural and CO2-saturating conditions. The model was used to analyze those factors limiting primary productivity during each of the experimental days. Due to a large investment in ribulose bisphosphate (RuBP) regeneration capacity, irradiance was rarely limiting, even during cloudy periods, but the limitation imposed by stomatal conductance was quite large, averaging over 30%. The fact that experimental leaves were maintained in a horizontal position is at least partially responsible for these results. Possible other reasons for this apparent excess of RuBP regeneration capacity visa-vis RuBP carboxylase-oxygenase concentration are discussed. |
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Keywords: | Photosynthesis model RuBP regeneration Stomatal limitation Arbutus |
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