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The Transport of Water from Soil to Shoot in Wheat Seedlings

The Transport of Water from Soil to Shoot in Wheat Seedlings Abstract A technique is described for precisely measuring the drop in water potential, Δψ, between the soil and the leaf xylem of wheat seedlings. The technique was used to explore the relation between transpiration rate and Δψ 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, nonlinearities 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. There was no sign of the major hydraulic resistance at the root: soil interface that other people have recently found. This content is only available as a PDF. © Oxford University Press http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Experimental Botany Oxford University Press

The Transport of Water from Soil to Shoot in Wheat Seedlings

PASSIOURA, J., B.
Journal of Experimental Botany , Volume 31 (1) – Feb 1, 1980
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Publisher
Oxford University Press
Copyright
© Oxford University Press
ISSN
0022-0957
eISSN
1460-2431
DOI
10.1093/jxb/31.1.333
Publisher site
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Abstract

Abstract A technique is described for precisely measuring the drop in water potential, Δψ, between the soil and the leaf xylem of wheat seedlings. The technique was used to explore the relation between transpiration rate and Δψ 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, nonlinearities 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. There was no sign of the major hydraulic resistance at the root: soil interface that other people have recently found. This content is only available as a PDF. © Oxford University Press

Journal

Journal of Experimental Botany – Oxford University Press

Published: Feb 1, 1980

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