Determination of Hydraulic and Osmotic Properties of Soybean Root Systems 1

AUTOR(ES)

Fiscus, Edwin L.

RESUMO

An analytical technique which allows the experimental determination of soybean (Glycine max L.) root properties is presented. Two major problems hamper the interpretation of experimental data. These are: (a) the influence of a possible boundary layer which raises the effective value of π ° above that of the bulk solution; and (b) the difficulty of obtaining an adequate measure of the internal osmotic pressure except at high values of volume flow rate due primarily to possible exchanges of solutes between the xylem and adjacent tissues. Consideration of these two problems leads to an interpretation of previous models which is reconcilable with the criticisms of Newman (Plant Physiology 1975 57: 738-739).

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