Shoot-Root-Nodule Partitioning in a Vegetative Legume—A Model

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Abstract
A dry-matter partitioning model of a vegetative legume which is both utilizing nitrate nitrogen and carrying out N2 fixation is described. It is an extension of a previously described root-shoot model, and is based on assumed transport pathways for carbon and nitrogen substrates, and utilization of those substrates for structural growth. The model is used to examine the consequences of varying the photosynthetic activity, the nitrate uptake activity, and the N2 fixation activity on the patterns of dry-matter partitioning and substrate fluxes within the plant. The predictions of the model agree with physiological expectation, and the model can therefore be used to provide an interpretation of experimental observations of such plant and crop responses.