A model of the effect of photosynthesis on respiration in higher plant leaves
Fiziologiya Rastenii 32(3): 421-430
An analysis is presented of a simple mathematical model of photosynthetic effects on respiration in leaves. The processes considered in the model have a common intermediate metabolic carbon pool (IMP) interacting with the environment via CO2 exchange and with the basic metabolic carbon pool (BMP). It has been shown that if respiration rate and carbon outflow from IMP to BMP are proportional to IMP capacity, then in steady-state conditions the respiration rate grows linearly with increasing photosynthetic rates and shows exponential time-related changes during transitions from one stationary state to another. By analyzing experimental results, it is shown that under natural CO2 concentration in the air and at 25.degree. the true rate of leaf respiration in C3 plants in the light (300-400 W .cntdot. m-2) constitutes about 40% of the rate of true photosynthesis, if reassimilation is taken into account. A functional relationship is established between growth respiration and cost coefficients with the suggested model parameters.