Temperature response of mesophyll conductance. Implications for the determination of rubisco enzyme kinetics and for limitations to photosynhtesis in vivo
CO2 transfer conductance from the intercellular airspaces of the leaf into the chloroplast, defined as mesophyll conductance (gm), is finite. Therefore, it will limit photosynthesis when CO2 is not saturating, as in C3 leaves in the present atmosphere. Little is known about the processes that determine the magnitude of gm. The process dominating gm is uncertain, though carbonic anhydrase, aquaporins, and the diffusivity of CO2 in water have all been suggested. The response of gm to temperature...[Show more]
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