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

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Biologia Plantarum

Abstract

Net photosynthetic (P N) and dark respiration (R D) 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. MaximalP N 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.

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Authors and Affiliations

  1. Department of Biology, University of Antwerp, UIA, Universiteitsplein 1, B-2610, Wilrijk, Belgium

    R. Cettlemans & I. Impens

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  1. R. Cettlemans
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  2. I. Impens
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Cettlemans, R., Impens, I. Study of CO2 exchange processes, resistances to carbon dioxide and chlorophyll content during leaf ontogenesis in poplar. Biol Plant 21, 302–306 (1979). https://doi.org/10.1007/BF02902214

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  • DOI: https://doi.org/10.1007/BF02902214

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