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Type: Journal article
Title: Increases in water potential gradient reduce xylem conductivity in whole plants. Evidence from a low-pressure conductivity method
Author: Brodribb, T.
Hill, R.
Citation: Plant Physiology, 2000; 123(3):1021-1028
Publisher: Amer Soc Plant Physiologists
Issue Date: 2000
ISSN: 0032-0889
Abstract: A new method using hydrostatic suctions (less than 0.02 MPa) was used to measure whole-root conductivity (K(r)) in saplings of two angiosperm pioneer trees (Eucalyptus regnans and Toona australis) and two rainforest conifers (Dacrycarpus dacrydioides and Nageia fleurii). The resultant K(r) was combined with measurements of stem and leaf hydraulic conductivity to calculate whole-plant conductivity and to predict leaf water potential (Psi(l)) during transpiration. At normal soil temperatures there was good agreement between measured and predicted Psi(l) during transpiration in all species. Changes in the soil-to-leaf water potential gradient were produced by root chilling, and in three of the four species, changes in Psi(l) corresponded to those expected by the effect of increased water viscosity on K(r). In one species, however, root chilling produced severe plant wilting and a decline in Psi(l) significantly below the predicted value. In this species Psi(l) decreased to a value close to, or below, the Psi(l) at 50% xylem cavitation. It is concluded that decreased whole-plant conductivity in T. australis resulted from a decrease in xylem conductivity due to stress-induced cavitation.
Keywords: Plant Roots
Biological Transport
Plant Structures
DOI: 10.1104/pp.123.3.1021
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Appears in Collections:Aurora harvest 2
Ecology, Evolution and Landscape Science publications
Environment Institute Leaders publications

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