Resistance to Water Flow in the Seminal Roots of Wheat

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Abstract
Water uptake by the seminal root system of wheat is described by a model which incorporates radial and axial resistance to flow in the root and the resistance to flow in the soil. In an experiment where wheat plants were dependent on subsoil water extracted from below 45 cm by one, three, or five seminal roots, calculations indicated that the axial resistance was the dominant resistance within the soil-root system and that flow rate changed predictably with changing axial resistance. The model also indicated that the observed shape of the metaxylem vessel in the seminal axes has important effects on the pattern of water uptake.

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