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the claim

Trees lift water higher than 10 meters using the cohesion-tension mechanism

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

The vast majority of botanical and physiological evidence supports the cohesion-tension mechanism as the primary driver for long-distance water transport in trees, despite alternative hypotheses occasionally being proposed.

The analysis

The claim that trees lift water via the cohesion-tension mechanism is a foundational, well-established concept in plant physiology supported by decades of empirical research, pressure chamber studies, and direct xylem measurements (e.g., papers 0, 1, and 2). While paper 1 discusses measurement nuances and paper 11 proposes an alternative model, the overwhelming scientific consensus and balance of the provided literature firmly support the cohesion-tension theory.

Evidence for · 3
Direct Measurement of Xylem Pressure in Leaves of Intact Maize Plants. A Test of the Cohesion-Tension Theory Taking Hydraulic Architecture into Consideration
Recorded source metadata

Chunfang Wei, Melvin T. Tyree, Ernst Steudle. Direct Measurement of Xylem Pressure in Leaves of Intact Maize Plants. A Test of the Cohesion-Tension Theory Taking Hydraulic Architecture into Consideration. 1999. https://doi.org/10.1104/pp.121.4.1191

Experimental measurements of xylem pressure are consistent with the cohesion-tension theory.

Evidence against · 1
A new theory of tree sap flow.
Recorded source metadata

Török A, Hajduné Kubovje AA, Hardi B, Bergmann R, Szigeti K, Máthé D, Hegedüs I. A new theory of tree sap flow.. 2025. https://doi.org/10.7717/peerj.19670

A minority paper proposes a novel alternative theory of sap flow, criticizing the cohesion-tension mechanism's reliance on capillary forces.

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More for · 2
Xylem water transport: is the available evidence consistent with the cohesion theory?
Recorded source metadata

U. ZIMMERMANN, F. C. MEINZER, R. BENKERT, J.J. ZHU, H. SCHNEIDER, G. GOLDSTEIN, E. KUCHENBROD, A. HAASE. Xylem water transport: is the available evidence consistent with the cohesion theory?. 1994. https://doi.org/10.1111/j.1365-3040.1994.tb02015.x

The cohesion theory has become widely accepted as explaining the mechanism of the ascent of sap, despite ongoing debates regarding absolute tension limits and measurement techniques.

Freezing of Conifer Xylem and the Cohesion‐Tension Theory
Recorded source metadata

Edward Sucoff. Freezing of Conifer Xylem and the Cohesion‐Tension Theory. 1969. https://doi.org/10.1111/j.1399-3054.1969.tb07394.x

Conifer freezing studies demonstrate that the cohesion-tension theory successfully accounts for sap transport and bubble dissolution dynamics.

The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 6401 Aug 2026
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