Chloroplastic Carbon Dioxide Concentration in Norway Spruce (Picea Abies [L.] Karst.) needles relates to the position within the crown |
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Authors: | Priwitzer T Urban O Šprtová M Marek MV |
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Institution: | (1) Department of Forest Environment, Forest Research Institute, T.G. Masaryka 22, SK-960 92 Zvolen, Slovak Republic;(2) Department of Ecological Physiology of Forest Trees, Institute of Landscape Ecology, Academy of Sciences of the Czech Republic, Kv tná 8, CZ-603 00 Brno, Czech Republic |
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Abstract: | Differences between sun (E) and shaded (S) foliage were studied in a Norway spruce (Picea abies L.] Karst.) stand. Response curves describing the dependence of the CO2 assimilation rate (PN) on the CO2 concentration at the catalytic site of ribulose-1,5-bisphosphate carboxylase/oxygenase, RuBPCO (PN-Cc) were estimated using the simultaneous measurements of chlorophyll fluorescence and leaf gas exchange. Higher PN, higher electron transport (Ja), higher carboxylation capacity (Vc), and higher RuBPCO activity ( ) for sun acclimated needles was found. The S-needles had higher portion of internal limitation and higher CO2 compensation concentration ( ) than the E-needles. Because higher degree of limitation of photosynthesis by carboxylation was ascertained, it can be assumed that photosynthesis in shade foliage is limited mainly by lower carboxylation capacity and by low chloroplastic CO2 concentration |
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Keywords: | carboxylation capacity electron transport rate net photosynthetic rate Norway spruce ribulose-1 5-bisphosphate carboxylase/oxygenase sun/shade foliage |
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