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Water relations of winter wheat: 3. Components of leaf water potential and the soil-plant water potential gradient

Published online by Cambridge University Press:  27 March 2009

J. S. Wallace ,
J. A. Clark  and
M. McGowan
J. S. Wallace
Affiliation:
Nottingham University School of Agriculture, Sutton Bonington, Loughborough, Leicestershire
J. A. Clark
Affiliation:
Nottingham University School of Agriculture, Sutton Bonington, Loughborough, Leicestershire
M. McGowan
Affiliation:
Nottingham University School of Agriculture, Sutton Bonington, Loughborough, Leicestershire
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Summary

Diurnal and seasonal changes in the total, osmotic and turgor potentials of winter wheat leaves are compared in two seasons of mild and severe soil water stress. Gradients of total water potential in the soil-plant system are also presented. In both seasons the total water potential of the leaves decreased in parallel with the soil water potential, concurrently leaf osmotic potential also decreased sufficiently to maintain positive leaf turgor potential. Eventually, under severe water stress, soil water potential approached –1·5 MPa and leaf turgor potential tended to zero during the middle of the day.

The potential drop across the soil-root system was twice that along the stem. Estimates of the water potential at the root surface varied diurnally and were often lower than the bulk soil water potential. In dry soil plants were unable to equilibrate with the soil water potential overnight. These results are consistent with the existence of significant resistance to water flow across the rhizosphere.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 3 , June 1983 , pp. 581 - 589
Copyright
Copyright © Cambridge University Press 1983

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