Photosynthesis electrical circuit

Now that we have discussed the CO2 resistances and conductances, we are ready to examine CO2 fluxes. We will do this for photosynthesis, a process that consumes CO2, as well as for respiration and photorespiration, processes that evolve CO2. Our analysis will use an electrical circuit so that we can represent the interrelationships among the various factors influencing net CO2 uptake by a leaf... 

We will consider CO2 fluxes and resistances for photosynthesis, respiration, and photorespiration using an electrical circuit (Fig. 8-17), which... 

The atmospheric CO2 concentration at which the CO2 evolved by respiration and photorespiration is exactly compensated by CO2 consumption in photosynthesis, leading to no net CO2 uptake, is known as the C02 compensation point. We can use the electrical circuit in Figure 8-17 and Equation 8.30 derived from it to demonstrate the CO2 compensation point for photosynthesis in terms of forces and fluxes. In particular, if we steadily decrease for a leaf initially having a net uptake of CO2, Jcoz will decrease and eventually will become zero when is... 

The electrical circuit in Figure 8-17 and Equations 8.30 and 8.31c developed from it are able to portray the CO2 compensation point, the light compensation point, as well as the general interrelations of the fluxes of CO2 for photosynthesis, photorespiration, and respiration in the light and in the dark. Our discussion and Figure 8-17 are for C3 plants—to apply an electrical circuit analog to C4 and Crassulacean acid metabolism (CAM)... 

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