Measured leaf dark respiratory CO 2 -release is not controlled by stomatal conductance.

Autor: Bruhn D; Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark., Faber AH; Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark.; Department of Ecoscience, Aarhus University, Aarhus, Denmark., Cristophersen KS; Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark., Nielsen JS; Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark., Griffin KL; Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, USA.; Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY, USA.; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA.
Jazyk: angličtina
Zdroj: Physiologia plantarum [Physiol Plant] 2024 Mar-Apr; Vol. 176 (2), pp. e14245.
DOI: 10.1111/ppl.14245
Abstrakt: Leaf dark respiratory CO 2 -release (R D ) is, according to some literature, dependent on the rate of leaf transpiration. If this is true, then at a given vapor pressure deficit, the leaf stomatal conductance (g s ) will be expected to be a controlling factor of measured R D at any given time. We artificially lowered leaf g s by applying abscisic acid (ABA). Although leaf R D generally covaried temporally with g s , artificially lowering g s by applying ABA does not affect the measured leaf R D . These results indicate that observed diel fluctuations in g s are not directly influencing the measured leaf R D , thereby simplifying both future studies and the interpretation of past studies of the underlying environmental- and physiological drivers of temporal variation in leaf R D .
(© 2024 The Authors. Physiologia Plantarum published by John Wiley & Sons Ltd on behalf of Scandinavian Plant Physiology Society.)
Databáze: MEDLINE
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