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Resistance to CO 2 diffusion in cuticular membranes of amphibious plants and the implication for CO 2 acquisition
Author(s) -
FROSTCHRISTENSEN HENNING,
FLOTO FRANZ
Publication year - 2007
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.1365-3040.2006.01599.x
Subject(s) - permeance , membrane , diffusion , botany , photosynthesis , boundary layer , analytical chemistry (journal) , chemistry , biology , chromatography , thermodynamics , permeation , biochemistry , physics
Cuticular membranes (CMs) were isolated from leaves of amphibious and submerged plants and their CO 2 resistances were determined as a contribution to establish quantitatively the series of resistances met by CO 2 diffusing from bulk water to the chloroplasts of submerged leaves. The isolation was performed enzymatically; permeabilities were determined and converted to resistances. The range of permeance values was 3 to 43 × 10 −6 m s −1 corresponding to resistance values of 23 to 295 × 10 3 s m −1 , i.e. of the same order of magnitude as boundary layer resistances. The sum of boundary layer, CM, leaf cell and carboxylation resistances could be contained within the total diffusion resistance as determined from the photosynthetic CO 2 affinity of the leaf. From the same species, the aerial leaf CM resistance was always higher than the aquatic leaf CM resistance. In a terrestrial plant, the CM resistance to CO 2 diffusion was found lower in leaves developed submerged.