C3 temperature response parameters from Bernacchi et al.
c3_temperature_param_bernacchi.RdParameters describing the temperature response of important C3 photosynthetic
parameters, intended to be passed to the
calculate_temperature_response function.
Format
List with 12 named elements that each represent a variable whose temperature-dependent value can be calculated using an Arrhenius equation, Johnson-Eyring-Williams equation, or a polynomial equation:
Gamma_star_at_25: The value of chloroplastic CO2 concentration at which CO2 gains from Rubisco carboxylation are exactly balanced by CO2 losses from Rubisco oxygenation (Gamma_star) at 25 degrees C.Gamma_star_norm:Gamma_starnormalized to its value at 25 degrees C.gmc_norm: The mesophyll conductance to CO2 diffusion (gmc) normalized to its value at 25 degrees C.J_norm: The electron transport rate (J) normalized to its value at 25 degrees C.Kc_at_25: The Michaelis-Menten constant for rubisco carboxylation (Kc) at 25 degrees C.Kc_norm:Kcnormalized to its value at 25 degrees C.Ko_at_25: The Michaelis-Menten constant for rubisco oxygenation (Ko) at 25 degrees C.Ko_norm:Konormalized to its value at 25 degrees C.RL_norm: The rate of non-photorespiratory CO2 release in the light (RL) normalized to its value at 25 degrees C.Tp_norm: The maximum rate of triose phosphate utilization (Tp) normalized to its value at 25 degrees C.Vcmax_norm: The maximum rate of rubisco carboxylation (Vcmax) normalized to its value at 25 degrees C.Vomax_norm: The maximum rate of rubisco oxygenation (Vomax) normalized toVcmaxat 25 degrees C.
In turn, each of these elements is a list with at least 2 named elements:
type: the type of temperature responseunits: the units of the corresponding variable.
Source
Many of these parameters are normalized to their values at 25 degrees C.
Vomax is normalized to the value of Vcmax at 25 degrees C. These
variables include _norm in their names to indicate this.
Arrhenius parameters for J were obtained from Bernacchi et al. (2003).
Here, we use the values determined from chlorophyll fluorescence measured from
plants grown at 25 degrees C (Table 1). Although Bernacchi et al. (2003)
reports values of Jmax, here we assume that both Jmax and the
light-dependent values of J follow the same temperature response
function and refer to it as J for compatibility with
c3_temperature_param_sharkey.
Johnson-Eyring-Williams parameters for gmc were obtained from Bernacchi
et al. (2002).
The Bernacchi papers from the early 2000s do not specify a temperature
response for Tp, so we instead use the Johnson-Eyring-Williams
response from Sharkey et al. (2007). Another option would be to use a flat
temperature response; in other words, to assume that Tp is constant
with temperature. This could be done with the following code, which takes the
flat response parameters from c3_temperature_param_flat:
within(c3_temperature_param_bernacchi, {Tp_norm = c3_temperature_param_flat$Tp_norm})
The Arrhenius parameters for the other variables were obtained from Bernacchi et al. (2001).
References:
Bernacchi, C. J., Singsaas, E. L., Pimentel, C., Jr, A. R. P. & Long, S. P. "Improved temperature response functions for models of Rubisco-limited photosynthesis" Plant, Cell & Environment 24, 253–259 (2001) [doi:10.1111/j.1365-3040.2001.00668.x ].
Bernacchi, C. J., Portis, A. R., Nakano, H., von Caemmerer, S. & Long, S. P. "Temperature Response of Mesophyll Conductance. Implications for the Determination of Rubisco Enzyme Kinetics and for Limitations to Photosynthesis in Vivo" Plant Physiology 130, 1992–1998 (2002) [doi:10.1104/pp.008250 ].
Bernacchi, C. J., Pimentel, C. & Long, S. P. "In vivo temperature response functions of parameters required to model RuBP-limited photosynthesis" Plant, Cell & Environment 26, 1419–1430 (2003) [doi:10.1046/j.0016-8025.2003.01050.x ].
Sharkey, T. D., Bernacchi, C. J., Farquhar, G. D. & Singsaas, E. L. "Fitting photosynthetic carbon dioxide response curves for C3 leaves" Plant, Cell & Environment 30, 1035–1040 (2007) [doi:10.1111/j.1365-3040.2007.01710.x ].