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- W52653764 abstract "Publisher Summary This chapter discusses the link between the delayed evolution of megaphyll leaves and atmospheric CO2. A model of leaf biophysics and physiology was used to investigate the functional consequences for Devonian megaphylls of the evolutionary relationship between stomatal density and atmospheric CO2. The model mathematically describes the key interactions between photosynthetic CO2 fixation, stomatal conductance, transpiration, and the leaf energy balance. It explicitly accounts for the influences of temperature, light, humidity and CO2 on these processes, and their feedbacks operating via CO2 concentration in the sub-stomatal cavities, leaf temperature and the leaf-air vapor pressure deficit. Model simulations show that hypothetical large megaphyll leaves would have provided no selective advantage over branched axes for photosynthesis in the Early Devonian high CO2 atmosphere. This is because the exceptionally low stomatal densities observed for this period would have restricted transpiration rates in these leaves, and so dissipated very little absorbed solar energy as latent heat, with a high associated risk of lethal overheating. Simulation results suggest that as stomatal density rose in response to falling CO2 levels through the Devonian and Early Carboniferous periods, large laminate megaphyll leaves increasingly gained a selective advantage in terms of carbon gain by photosynthesis, without the penalty of high temperature damage." @default.
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- W52653764 date "2004-01-01" @default.
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- W52653764 title "Falling atmospheric CO2—the key to megaphyll leaf origins" @default.
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