1.2 KiB
1.2 KiB
Here is a concise summary of the provided article on photosynthesis in C3 and C4 plants:
Photosynthesis Model
- C3 plants use the Farquhar et al. (1980) model, while C4 plants use the Collatz et al. (1992) model.
- Leaf net photosynthesis is the minimum of three rates: Rubisco-limited (Ac), light-limited (Aj), and product-limited (Ap), minus leaf respiration (Rd).
C3 Plant Photosynthesis
- Ac depends on internal CO2 (ci), Vcmax, and Michaelis-Menten constants.
- Aj depends on electron transport rate (Jx) and absorbed light (IPSII).
- Ap is 3 times the triose phosphate utilization rate (Tp).
C4 Plant Photosynthesis
- Ac is simply Vcmax.
- Aj varies with absorbed light (φ) and quantum efficiency (α).
- Ap depends on ci and the PEP carboxylase-limited rate constant (kp).
Temperature Dependence
- Parameters like Vcmax, Jmax, Tp, Rd are adjusted for leaf temperature (Tv) using Arrhenius and high-temperature inhibition functions.
- C4 plants use a different temperature response function.
Acclimation
- Vcmax and Jmax are allowed to acclimate to growth temperature (T10) by adjusting the entropy terms (ΔS).
- The Jmax/Vcmax ratio at 25°C also decreases with warmer growth temperatures.