Short communication. Comparative measurements of xylem pressure in transpiring and non-transpiring leaves by means of the pressure chamber and the xylem pressure probe

1998 ◽  
Vol 49 (327) ◽  
pp. 1757-1760 ◽  
Author(s):  
P Melcher
Keyword(s):  
Short Communication ◽  
Pressure Chamber ◽  
Pressure Probe ◽  
Xylem Pressure ◽  
Xylem Pressure Probe

scholarly journals Comparative measurements of xylem pressure in transpiring and non-transpiring leaves by means of the pressure chamber and the xylem pressure probe

1998 ◽  
Vol 49 (327) ◽  
pp. 1757-1760 ◽  
Author(s):  
P. J. Melcher ◽  
F. C. Meinzer ◽  
D. E. Yount ◽  
G. Goldstein ◽  
U. Zimmermann
Keyword(s):  
Pressure Chamber ◽  
Pressure Probe ◽  
Xylem Pressure ◽  
Xylem Pressure Probe

Long-term xylem pressure measurements in the liana Tetrastigma voinierianum by means of the xylem pressure probe

Planta ◽  
1995 ◽  
Vol 196 (4) ◽  
Author(s):  
Rainer Benkert ◽  
Jian-Jun Zhu ◽  
Gertraud Zimmermann ◽  
Roman T�rk ◽  
Friedrich-Wilhelm Bentrup ◽  
...  
Keyword(s):  
Pressure Probe ◽  
Pressure Measurements ◽  
Xylem Pressure ◽  
Xylem Pressure Probe

scholarly journals Diurnal variation in the radial reflection coefficient of intact maize roots determined with the xylem pressure probe

1997 ◽  
Vol 48 (12) ◽  
pp. 2045-2053 ◽  
Author(s):  
H. Schneider ◽  
N. Wistuba ◽  
B. Miller ◽  
P. Geβner ◽  
F. Thürmer ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Diurnal Variation ◽  
Pressure Probe ◽  
Xylem Pressure ◽  
Maize Roots ◽  
Xylem Pressure Probe

Long-term xylem pressure measurements in the lianaTetrastigma voinierianum by means of the xylem pressure probe

Planta ◽  
1995 ◽  
Vol 196 (4) ◽  
pp. 804-813 ◽  
Author(s):  
Rainer Benkert ◽  
Jian-Jun Zhu ◽  
Gertraud Zimmermann ◽  
Roman T�rk ◽  
Friedrich-Wilhelm Bentrup ◽  
...  
Keyword(s):  
Pressure Probe ◽  
Pressure Measurements ◽  
Xylem Pressure ◽  
Xylem Pressure Probe

Mechanisms of long-distance water transport in plants: a re-examination of some paradigms in the light of new evidence

1993 ◽  
Vol 341 (1295) ◽  
pp. 19-31 ◽  
Keyword(s):  
Water Transport ◽  
Pressure Probe ◽  
Nmr Imaging ◽  
Long Distance ◽  
Indirect Methods ◽  
Xylem Pressure ◽  
Direct Measurements ◽  
Xylem Pressure Probe ◽  
Cohesion Theory ◽  
New Evidence

According to the widely accepted Cohesion Theory, water is pulled by transpiration from the roots through the xylem to the leaves. It is believed that this process results in the development of large tensions (negative pressures) in the xylem. In this chapter we re-examine some of the indirect methods that were used to support the formulation of this theory. We conclude that because of ambiguities inherent in the interpretation of the results obtained by these approaches the evidence in support of the Cohesion Theory is not conclusive. Direct measurements of xylem pressure in herbaceous plants and tall trees have yielded values of tensions that are inconsistent with the Cohesion Theory. In the light of the data from the xylem pressure probe and nuclear magnetic resonance (NMR)-imaging, we believe that several forces may be responsible for long-distance water transport in plants. These include tension, osmotic pressure, capillary and air-water interfacial forces.

Pressure Chamber and Air Flow Porometer for Rapid Field Indication of Water Status and Stomatal Condition in Wheat

1977 ◽  
Vol 13 (4) ◽  
pp. 341-351 ◽  
Author(s):  
R. A. Fischer ◽  
M. Sanchez ◽  
J.R. Syme
Keyword(s):  
Field Experiments ◽  
Water Status ◽  
Air Flow ◽  
Pressure Chamber ◽  
Plant Responses ◽  
Pressure Potential ◽  
Xylem Pressure ◽  
Xylem Pressure Potential ◽  
Plant Water Potential ◽  
Key Features

SUMMARYPlant water potential and leaf diffusive conductance, key features of plant responses to water stress in field experiments, can be estimated, respectively, by xylem pressure potential measured with the pressure chamber apparatus, and leaf permeability measured with the air flow porometer. This paper describes modifications to these two techniques in order to increase the rapidity of measurements in wheat to 60/h with the pressure chamber, and 200/h with the porometer. Rapid measurements are needed because of the large within-and between-plot errors encountered with daytime measurements in typical field experiments, examples of which are presented.

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