The University of Southampton
University of Southampton Institutional Repository

The control of leaf growth of Betula and Acer by photoenvironment

The control of leaf growth of Betula and Acer by photoenvironment
The control of leaf growth of Betula and Acer by photoenvironment
Leaf extension of one-year-old seedlings of silver birch (Betula pendula Roth.) and sycamore (Acer pseudoplatanus L.), was measured using linear variable transducers (LVDTs) interfaced to a microcomputer. Birch and sycamore seedlings exhibited contrasting patterns of leaf extension during a diurnal cycle with a 16 h photoperiod. Birch leaves grew more rapidly when illuminated; growth during the photoperiod was approximately doubled when compared with growth in the dark. Mean relative growth rates ±SE at 'lights-on + 3 h' and 'lights-off + 5 h' were 0.0136 ± 0.0016 and 0.0066 ± 0.0005 h?1 respectively. In direct contrast, growth of sycamore leaves was increased when leaves were darkened; mean relative growth rates + SE at 'lights-on+3 h' and 'lights-off + 5 h' were 0.0056 ± 0.0005 and 0.0094 ± 0.0008 h-1 respectively.

When leaves of birch and sycamore were darkened, increased leaf turgor was measured in both species, but only in sycamore was this higher night-time turgor associated with a higher rate of leaf growth.

Cell wall extensibility (WEX), an indication of the ability of cell walls to loosen and extend irreversibly, and cell surface pH were assessed in darkened and illuminated leaves of both species. An increase in WEX was measured when birch leaves were illuminated (P? 0.001) and this was accompanied by a decline in cell surface pH (P? 0.001). However, when leaves of sycamore were illuminated, WEX declined (P? 005) and cell surface pH increased (P? 0.001).

The ability of these species to survive beneath a woodland canopy is discussed in relation to the cellular factors controlling their leaf growth.
0028-646X
259-268
Taylor, Gail
f3851db9-d37c-4c36-8663-e5c2cb03e171
Davies, W. J.
a9f5302d-a706-42aa-b710-342d79498466
Taylor, Gail
f3851db9-d37c-4c36-8663-e5c2cb03e171
Davies, W. J.
a9f5302d-a706-42aa-b710-342d79498466

Taylor, Gail and Davies, W. J. (1985) The control of leaf growth of Betula and Acer by photoenvironment. New Phytologist, 101 (2), 259-268.

Record type: Article

Abstract

Leaf extension of one-year-old seedlings of silver birch (Betula pendula Roth.) and sycamore (Acer pseudoplatanus L.), was measured using linear variable transducers (LVDTs) interfaced to a microcomputer. Birch and sycamore seedlings exhibited contrasting patterns of leaf extension during a diurnal cycle with a 16 h photoperiod. Birch leaves grew more rapidly when illuminated; growth during the photoperiod was approximately doubled when compared with growth in the dark. Mean relative growth rates ±SE at 'lights-on + 3 h' and 'lights-off + 5 h' were 0.0136 ± 0.0016 and 0.0066 ± 0.0005 h?1 respectively. In direct contrast, growth of sycamore leaves was increased when leaves were darkened; mean relative growth rates + SE at 'lights-on+3 h' and 'lights-off + 5 h' were 0.0056 ± 0.0005 and 0.0094 ± 0.0008 h-1 respectively.

When leaves of birch and sycamore were darkened, increased leaf turgor was measured in both species, but only in sycamore was this higher night-time turgor associated with a higher rate of leaf growth.

Cell wall extensibility (WEX), an indication of the ability of cell walls to loosen and extend irreversibly, and cell surface pH were assessed in darkened and illuminated leaves of both species. An increase in WEX was measured when birch leaves were illuminated (P? 0.001) and this was accompanied by a decline in cell surface pH (P? 0.001). However, when leaves of sycamore were illuminated, WEX declined (P? 005) and cell surface pH increased (P? 0.001).

The ability of these species to survive beneath a woodland canopy is discussed in relation to the cellular factors controlling their leaf growth.

PDF
The_control_of_leaf.pdf - Other
Restricted to Repository staff only
Request a copy

More information

Published date: 1985

Identifiers

Local EPrints ID: 159759
URI: https://eprints.soton.ac.uk/id/eprint/159759
ISSN: 0028-646X
PURE UUID: fe2a2b3d-c000-41f6-a90d-df96a3b5fe9d
ORCID for Gail Taylor: ORCID iD orcid.org/0000-0001-8470-6390

Catalogue record

Date deposited: 07 Jul 2010 08:53
Last modified: 25 May 2019 00:36

Export record

Contributors

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

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×