biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 21:302-306, 1979 | DOI: 10.1007/BF02902214

Study of CO2 exchange processes, resistances to carbon dioxide and chlorophyll content during leaf ontogenesis in poplar

R. Cettlemans1, I. Impens1
1 Department of Biology, University of Antwerp, UIA, Wilrijk, Belgium

Net photosynthetic (PN) and dark respiration (RD) rate, stomatal (rs') and internal (ri') resistances to carbon dioxide were measured by gas exchange methods on leaves of different ages, expressed in leaf plastochron index units (LPI) for a fast growing poplar cultivar Unal 2. Although the optimal leaf age differs slightly for the different gas exchange parameters, leaf ontogeny is reflected in the same way in these different parameters. MaximalPN and minimalrs' and ri' values were found at LPI between 6 and 10. Chlorophyll concentrations were lowest at LPI lower than 10 although an increase in two steps was found, when leaf age increases up to maturity.

Keywords: Populus deltoides S. 9-2 ×P. nigra cv. Ghoy; photosynthesis; dark respiration; stomatal resistance; nternal resistance

Received: February 13, 1979; Accepted: February 26, 1979; Published: July 1, 1979  Show citation

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Cettlemans, R., & Impens, I. (1979). Study of CO2 exchange processes, resistances to carbon dioxide and chlorophyll content during leaf ontogenesis in poplar. Biologia plantarum, 21(4), 302-306. doi: 10.1007/BF02902214
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