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  1. Vol. 11 No. 3, p. 403-407
     
    Received: Oct 21, 1970
    Published: May, 1971


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doi:10.2135/cropsci1971.0011183X001100030028x

Resistances to Water Transport in Soybean, Bean, and Sunflower1

  1. J. S. Boyer2

Abstract

Abstract

The resistance to water transport in whole plants and plant segments was measured by a transient flow method for soybean (Glycine max L. (Merr.) var. ‘Harosoy’), bean (Phaseolus vulgaris L. var. ‘Bountiful’), and sunflower (Helianthus annuus L. var. ‘Russian Mammoth’). The resistance to water transport in whole soybean plants was twice that of sunflower and bean. The high resistance in soybean was caused by a high resistance in the root tissue external to the root vascular tissue. The data indicate that leaf water potential will have to drop about twice as far in soybean as in sunflower or bean to maintain a given rate of water transport to the leaf evaporating surface.

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