The transpiration of water at negative pressures in a synthetic tree

@article{Wheeler2008TheTO,
  title={The transpiration of water at negative pressures in a synthetic tree},
  author={Tobias D. Wheeler and Abraham Duncan Stroock},
  journal={Nature},
  year={2008},
  volume={455},
  pages={208-212}
}
Plant scientists believe that transpiration—the motion of water from the soil, through a vascular plant, and into the air—occurs by a passive, wicking mechanism. This mechanism is described by the cohesion-tension theory: loss of water by evaporation reduces the pressure of the liquid water within the leaf relative to atmospheric pressure; this reduced pressure pulls liquid water out of the soil and up the xylem to maintain hydration. Strikingly, the absolute pressure of the water within the… 
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References

SHOWING 1-10 OF 37 REFERENCES
Sap Pressure in Vascular Plants
TLDR
A method is described which permits measurement of sap pressure in the xylem of vascular plants, and finds that in tall conifers there is a hydrostatic pressure gradient that closely corresponds to the height and seems surprisingly little influenced by the intensity of transpiration.
Hydrogel Control of Xylem Hydraulic Resistance in Plants
TLDR
The existence of an ion-mediated response breaks the long-held paradigm of the xylem as a system of inert pipes and suggests a mechanism by which plants may regulate their internal flow regime.
Cavitation pressure in water.
TLDR
This work investigates the limiting mechanical tension (negative pressure) that liquid water can sustain before cavitation occurs, and describes the method which consists in focusing a high amplitude sound wave in the bulk liquid, away from any walls, to obtain highly reproducible results.
A simple method for the generation of negative pressure in liquids
A new technique for the generation of negative pressure in liquids is described, based on the pressure difference that exists across a curved liquid-vapour interface. Menisci in pores having very
Demonstration of the Lifting Power of Evaporation
The lifting power of evaporation and the liquid tension present in water are two important forces in the transpiration stream. The desirability of having a better conception of these forces has led
CAVITATION RESISTANCE AMONG 26 CHAPARRAL SPECIES OF SOUTHERN CALIFORNIA
TLDR
Stem mechanical strength, fiber properties, and post-fire regeneration type appear to be key factors in the evolution of cavitation resistance among chaparral shrubs.
Use of the tensile strength of water for the direct measurement of high soil suction
Discussions The authors express their appreciation for the additional information provided by the Discussers on the subject of the tensile strength of water. This is a new subject area to the
Sorption and transport of water vapor in thin polymer films at 35 °C
Using a gravimetric technique, experimental data at 35 °C are reported for isothermal sorption equilibria and sorption kinetics of water vapor in poly(N,N-dimethyl methacrylamide) (PDMAA),
An Evaporation-Based Disposable Micropump Concept for Continuous Monitoring Applications
An inexpensive and simple pumping principle is described that is capable of delivering both small and constant flow rates (10–1,000 nl/min) over a longer period of time (days to weeks). The concept
Embolism repair and xylem tension: Do We need a miracle?
TLDR
Xylem hydraulic conductivity is often substantially reduced by cavitation, and negative hydrostatic pressure makes water transport in the xylem intrinsically vulnerable to cavitation.
...
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