Affiliation:
1. Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
Abstract
Abstract
C4 plants play a key role in world agriculture. For example, C4 crops such as maize and sorghum are major contributors to food production in both developed and developing countries, and the C4 grasses sugarcane, miscanthus, and switchgrass are major plant sources of bioenergy. In the challenge to manipulate and enhance C4 photosynthesis, steady-state models of leaf photosynthesis provide an important tool for gas exchange analysis and thought experiments that can explore photosynthetic pathway changes. Here a previous C4 photosynthetic model developed by von Caemmerer and Furbank has been updated with new kinetic parameterization and temperature dependencies added. The parameterization was derived from experiments on the C4 monocot, Setaria viridis, which for the first time provides a cohesive parameterization. Mesophyll conductance and its temperature dependence have also been included, as this is an important step in the quantitative correlation between the initial slope of the CO2 response curve of CO2 assimilation and in vitro phosphoenolpyruvate carboxylase activity. Furthermore, the equations for chloroplast electron transport have been updated to include cyclic electron transport flow, and equations have been added to calculate the electron transport rate from measured CO2 assimilation rates.
Funder
Australian Research Council
ARC Centre of Excellence for Translational Photosynthesis
Publisher
Oxford University Press (OUP)
Reference114 articles.
1. The response of photosynthesis and stomatal conductance to rising CO2: mechanisms and environmental interactions;Ainsworth;Plant, Cell & Environment,2007
2. Diffusion of CO2 across the mesophyll–bundle sheath cell interface in a C4 plant with genetically reduced PEP carboxylase activity;Alonso-Cantabrana;Plant Physiology,2018
3. Detection in C3, C4 and CAM plant leaves of a low-Km(CO2) form of RuDP carboxylase, having high RuDP oxygenase activity at physiological pH.;Badger,1974
4. Online CO2 and H2O oxygen isotope fractionation allows estimation of mesophyll conductance in C4 plants, and reveals that mesophyll conductance decreases as leaves age in both C4 and C3 plants;Barbour;New Phytologist,2016
5. Deriving C4 photosynthetic parameters from combined gas exchange and chlorophyll fluorescence using an Excel tool: theory and practice;Bellasio;Plant, Cell & Environment,2016