A Simulation Study of The Functional Requirements and Distribution of Leghaemoglobin in Relation to Biological Nitrogen Fixation in Legume Root Nodules

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Abstract
A simulation model incorporating structural, biochemical and physiological features of root nodules of soyabean is described. The simulation is used to examine the effects of varying the location and kinetics of leghaemoglobin within infected cells. A striking feature is the capacity of the simulated nodule to maintain its activity in the face of these changes, in spite of relatively large changes in concentrations of free O2, and leghaemoglobin oxygenation with the cells. These properties arise from the diffusion resistance and intracellular demand for O2, due to the respiratory activities of the bacteroids.