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Quantum yields for CO 2 uptake in some diploid and tetraploid plant species
Author(s) -
OSBORNE B. A.,
GARRETT M. K.
Publication year - 1983
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1983.tb01886.x
Subject(s) - ploidy , photosynthesis , biology , absorptance , botany , quantum yield , carbon fixation , genetics , physics , optics , gene , fluorescence , reflectivity
. Quantum (photon) yields for CO 2 uptake on an absorbed photon fluence rate (PFR) basis (φ a ) were determined for a number of diploid and tetraploid species under a range of experimental conditions. Little variation in φ a was found either between species or across ploidy levels, which suggests that there are no intrinsic differences in the kinetics of CO 2 fixation. Variations in photosynthetic rate or quantum yield expressed on an incident PFR basis (φ j ) were found to be largely due to differences in leaf absorptance. On this basis these results do not support the biochemical evidence showing ploidy‐related differences in the K m (CO 2 ) of ribulose ‐1,5‐bisphosphate carboxylase/oxygenase. However, there are obvious difficulties in relating in vitro enzyme kinetic data to in vivo studies and these problems are discussed.