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Yield turgor of growing leaves of betula and acer

Yield turgor of growing leaves of betula and acer
Yield turgor of growing leaves of betula and acer
Leaf growth of first year seedlings of silver birch (Betula pendula Roth.) and sycamore (Acer pseudoplatanus L.) was measured continuously using linear variable transducers (LVTDs) when shoots were enclosed in small Perspex chambers, in which temperature, vapour pressure deficit (VPD) and photon fiuence rate were all controlled. A new method was used to measure the yield turgor (Y) of growing leaves. The VPD of air in the chamber was altered so that transpiration rate was changed. Turgor pressures, measured using thermocouple psychrometers, and growth rates varied as a result of this treatment, and the relationship between leaf growth and turgor pressure (P) and the turgor pressure at which growth ceased (Y) could be measured within a very short time period using well-watered plants.

The value of Y was constant for illuminated and darkened leaves of both species, but Y was higher for sycamore leaves (Y= 0.250 MPa) compared with the value for birch leaves (K = 0.071 MPa).

Cell wall extensibility (w, MPa?1 h?1) was calculated from the slope of the line relating turgor pressure to growth. For leaves of birch, there was a significant increase in m when leaves were illuminated (m, dark = 1.3 × 10?2 MPa?1 h?1; m, light = 46 × 10?2 MPa?1), similar in magnitude to the increase in wall extensibility measured previously by mechanical analysis of killed leaf tissue (WEX, the plasticity of tissue subjected to a uniaxial stress). No change in m was detected when darkened sycamore leaves were illuminated (m, dark = 4.2 × 10?2 MPa?1 h?1; m, light = 4.4 × 10?2 MPa?1 h?1).

The results confirm earlier work on the factors controlling the diurnal patterns of leaf growth of these two species and suggest that leaf growth of birch is primarily limited by cell wall loosening but that the growth of sycamore leaves may be limited by leaf turgor.
0028-646X
347-353
Taylor, G.
f3851db9-d37c-4c36-8663-e5c2cb03e171
Davies, W. J.
a9f5302d-a706-42aa-b710-342d79498466
Taylor, G.
f3851db9-d37c-4c36-8663-e5c2cb03e171
Davies, W. J.
a9f5302d-a706-42aa-b710-342d79498466

Taylor, G. and Davies, W. J. (1986) Yield turgor of growing leaves of betula and acer. New Phytologist, 104 (3), 347-353. (doi:10.1111/j.1469-8137.1986.tb02902.x).

Record type: Article

Abstract

Leaf growth of first year seedlings of silver birch (Betula pendula Roth.) and sycamore (Acer pseudoplatanus L.) was measured continuously using linear variable transducers (LVTDs) when shoots were enclosed in small Perspex chambers, in which temperature, vapour pressure deficit (VPD) and photon fiuence rate were all controlled. A new method was used to measure the yield turgor (Y) of growing leaves. The VPD of air in the chamber was altered so that transpiration rate was changed. Turgor pressures, measured using thermocouple psychrometers, and growth rates varied as a result of this treatment, and the relationship between leaf growth and turgor pressure (P) and the turgor pressure at which growth ceased (Y) could be measured within a very short time period using well-watered plants.

The value of Y was constant for illuminated and darkened leaves of both species, but Y was higher for sycamore leaves (Y= 0.250 MPa) compared with the value for birch leaves (K = 0.071 MPa).

Cell wall extensibility (w, MPa?1 h?1) was calculated from the slope of the line relating turgor pressure to growth. For leaves of birch, there was a significant increase in m when leaves were illuminated (m, dark = 1.3 × 10?2 MPa?1 h?1; m, light = 46 × 10?2 MPa?1), similar in magnitude to the increase in wall extensibility measured previously by mechanical analysis of killed leaf tissue (WEX, the plasticity of tissue subjected to a uniaxial stress). No change in m was detected when darkened sycamore leaves were illuminated (m, dark = 4.2 × 10?2 MPa?1 h?1; m, light = 4.4 × 10?2 MPa?1 h?1).

The results confirm earlier work on the factors controlling the diurnal patterns of leaf growth of these two species and suggest that leaf growth of birch is primarily limited by cell wall loosening but that the growth of sycamore leaves may be limited by leaf turgor.

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Published date: 1986

Identifiers

Local EPrints ID: 159765
URI: https://eprints.soton.ac.uk/id/eprint/159765
ISSN: 0028-646X
PURE UUID: 9034f133-faf2-4af3-9900-ffc1022fbb49
ORCID for G. Taylor: ORCID iD orcid.org/0000-0001-8470-6390

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Date deposited: 07 Jul 2010 09:10
Last modified: 25 May 2019 00:36

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Author: G. Taylor ORCID iD
Author: W. J. Davies

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