The effect of temperature on C₄‐type leaf photosynthesis parameters

Abstract

C4-type photosynthesis is known to vary with growth and measurement temperatures. In an attempt to quantify its variability with measurement temperature, the photosynthetic parameters -the maximum catalytic rate of the enzyme ribulose 1·5-bisphosphate carboxylase/oxygenase (Rubisco) (Vcmax), the maximum catalytic rate of the enzyme phosphoenolpyruvate carboxylase (PEPC) (Vpmax) and the maximum electron transport rate ( These parameters should be further tested with C4 plants for validation. Other model key parameters such as the mesophyll cell conductance to CO2 (gi), the bundle sheath cells conductance to CO2 (gbs) and Michaelis-Menten constants for CO2 and O2 (Kc, Kp and Ko) also vary with temperature and should be better parameterized.

Temperature response of C4 photosynthesis: Biochemical analysis of Rubisco, Phosphoenolpyruvate Carboxylase and Carbonic Anhydrase in Setaria viridis.

“…5) was similar to measurements from other species (Buchanan-Bollig et al, 1984;Wu and Wedding, 1987;Chen et al, 1994;Massad et al, 2007), which showed a change in the temperature response above 25°C. While this change in the temperature response has been observed previously, the magnitude varies between studies and species (Buchanan-Bollig et al, 1984;Wu and Wedding, 1987;Chen et al, 1994;Massad et al, 2007). It is unclear if there are differences in the temperature response of V pmax between species, because there are not sufficient comparisons made within a single study.…”

“…However, the temperature response of K P has been left out of models of C 4 photosynthesis (Berry and Farquhar, 1978;von Caemmerer, 2000) or a predicted temperature response has been used (Chen et al, 1994;Massad et al, 2007). This is in contrast to the incorporation of measured Rubisco temperature responses that have been used in the C 4 model (Berry and Farquhar, 1978).…”

“…The solid lines are the modeled temperature responses from this report (Table I), with 95% confidence intervals in gray. Dotted lines are the temperature responses for V pmax for maize (Massad et al, 2007) and for K P (Chen et al, 1994) normalized to S. viridis at 25˚C. Black circles are the means of three biological replicates 6 SE, and the white circle in B is the K P reported previously for maize 6 SE (Bauwe, 1986).…”

Can the Cyanobacterial Carbon-Concentrating Mechanism Increase Photosynthesis in Crop Species? A Theoretical Analysis

“…As discussed earlier, increasing the amount of cytochrome b 6 /f complex may be one approach to increase J max (Price et al, 1998;Ruuska et al, 2000). Increasing J max in C 3 species certainly seems possible, since C 4 species tend to have higher values of J max than C 3 species (Wullschleger, 1993;Massad et al, 2007). There is also evidence that, in addition to electron transport, RuBP regeneration is colimited by enzyme activity in the Calvin cycle, specifically the amount of sedoheptulose-1,7-bisphosphatase (SBPase; Harrison et al, 2001), and increasing the concentration of SBPase has been shown to increase carbon assimilation and biomass in current atmospheric [CO 2 ] (Lefebvre et al, 2005).…”

The Evaluation of Radiation Use Efficiency and Leaf Area Index Development for the Estimation of Biomass Accumulation in Short Rotation Poplar and Annual Field Crops

“…OR requires high nutrient availability, while SM is mainly affected by temperature. Higher temperature requirements are typical for C 4 crops [93,94].…”