Journal of Experimental Botany, Vol 49, 1757-1760, Copyright © 1998 by Oxford University Press
P Melcher, F Meinzer, D Yount, G Goldstein and U Zimmermann
Simultaneous measurements were made with the xylem pressure probe on
exposed, transpiring leaves and with the Scholander pressure chamber on
both transpiring and covered, non-transpiring leaves of sugarcane and maize
plants. Xylem tensions inferred from pressure chamber balancing pressures
on non-transpiring leaves were similar to those measured directly with the
xylem pressure probe in transpiring leaves. However, tensions inferred with
the pressure chamber on transpiring leaves that were placed in plastics
bags just prior to excision were up to 0.6 MPa greater than those measured
concurrently with the xylem pressure probe. These findings suggest that
relatively large differences in water potential between the xylem and bulk
leaf tissue can exist during periods of rapid transpiration, and they
confirm that the balance pressure of an excised, previously transpiring
leaf is only a measure of the bulk average equilibrium leaf water potential
and not of the true xylem pressure that existed prior to excision.Key
words: Cohesion-Tension theory, xylem pressure probe, pressure chamber,
xylem tension.
ARTICLES
Short communication. Comparative measurements of xylem pressure in transpiring and non-transpiring leaves by means of the pressure chamber and the xylem pressure probe
Department of Botany, University of Hawaii, Honolulu, Hawaii 96822, USA; Hawaii Agriculture Research Center, Aiea, Hawaii 96701, USA; Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA; Lehrstuhl fur Biotechnologie, Biozentrum, Am Hubland, D 97074 Wursburg, Germany; Corresponding author
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