Axial Resistance to Water Movement in Broad Bean (Vicia faba) Roots

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Abstract
A new potometer method was devised to measure the rates of water uptake by small portions of an intact root system. An analysis of the relative effects of radial resistance (calculated from the potometer data) and axial resistance (calculated from the xylem dimensions) snowed that axial resistance was not likely to be important. Root water potentials were determined by finding the osmotic potential of the solution in the potometer which just prevented water uptake by the root. Root-tip water potentials were similar in long and short roots suggesting that any effect of axial resistance was similar in both types of root.

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