Section 7
Chapter 6,782

The transport of water from soil to shoot in wheat seedlings triticum aestivum cultivar gabo

Passioura, J.B.

Journal of Experimental Botany 31(120): 333-346


ISSN/ISBN: 0022-0957
Accession: 006781810

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A technique is described for precisely measuring the drop in water potential,.DELTA.psi., between the soil and the leaf xylem of wheat seedlings. The technique was used to explore the relation between transpiration rate and.DELTA.psi. at various times during the monotonic drying of the soil in which the plants were growing. When the soil was wet, the relation was linear, but, as the soil dried, non-linearities appeared which were, in the main, explicable in terms of simple soil physical models describing the flow of water through the soil to the roots.

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