The University of Southampton
University of Southampton Institutional Repository

The influence of photosynthetically-active radiation and simulated shadelight on the control of leaf growth of Betula and Acer

The influence of photosynthetically-active radiation and simulated shadelight on the control of leaf growth of Betula and Acer
The influence of photosynthetically-active radiation and simulated shadelight on the control of leaf growth of Betula and Acer
The primary aim of the study was to quantify the effects of photosynthetically-active radiation (PAR) on extension of leaves of silver birch (Betula pendula Roth.) and sycamore (Acer pseudoplatanus L.). Plants grown at 250 ?mol m?2 s?1 were exposed to a range of fluence rates (0·680 ?mol m? s?1) whilst enclosed in Perspex chambers in which temperature, vapour pressure deficit and photoenvironment were all controlled. Measurements of leaf extension, water relations, and cell wall extensibility (VVEX) were made at the end of a 3 h exposure period.

For leaves of birch, reducing the fluence rate resulted in reduced leaf extension and a lowering of WEX. Exposure of sycamore seedlings for 3 h to different values of PAR had little effect on the growth of leaves and WEX remained constant. The characteristics of net photosynthesis also differed for the two species and photosynthesis and wall loosening may be linked.

Since natural woodland shadelight, in addition to reduced PAR, also has a reduced R/FR ratio, a second group of seedlings were placed in a photoenvironment which simulated shadelight (low PAR, R/FR) for 28 d. This treatment reduced extension rate and final leaf size for both species. Measurements of extension, water relations and WEX made when seedlings were exposed to shadelight whilst held in the Perspex chambers revealed differences in the control of leaf growth for the two species.

It is confirmed that leaves of birch are highly responsive to changes in PAR with cell wall loosening the most likely process controlling this response.
0028-646X
393-398
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. (1988) The influence of photosynthetically-active radiation and simulated shadelight on the control of leaf growth of Betula and Acer. New Phytologist, 108 (4), 393-398. (doi:10.1111/j.1469-8137.1988.tb04179.x).

Record type: Article

Abstract

The primary aim of the study was to quantify the effects of photosynthetically-active radiation (PAR) on extension of leaves of silver birch (Betula pendula Roth.) and sycamore (Acer pseudoplatanus L.). Plants grown at 250 ?mol m?2 s?1 were exposed to a range of fluence rates (0·680 ?mol m? s?1) whilst enclosed in Perspex chambers in which temperature, vapour pressure deficit and photoenvironment were all controlled. Measurements of leaf extension, water relations, and cell wall extensibility (VVEX) were made at the end of a 3 h exposure period.

For leaves of birch, reducing the fluence rate resulted in reduced leaf extension and a lowering of WEX. Exposure of sycamore seedlings for 3 h to different values of PAR had little effect on the growth of leaves and WEX remained constant. The characteristics of net photosynthesis also differed for the two species and photosynthesis and wall loosening may be linked.

Since natural woodland shadelight, in addition to reduced PAR, also has a reduced R/FR ratio, a second group of seedlings were placed in a photoenvironment which simulated shadelight (low PAR, R/FR) for 28 d. This treatment reduced extension rate and final leaf size for both species. Measurements of extension, water relations and WEX made when seedlings were exposed to shadelight whilst held in the Perspex chambers revealed differences in the control of leaf growth for the two species.

It is confirmed that leaves of birch are highly responsive to changes in PAR with cell wall loosening the most likely process controlling this response.

PDF
The_influence_of_photosynthetically-active_radiation.pdf - Version of Record
Restricted to Repository staff only
Request a copy

More information

Published date: 1988

Identifiers

Local EPrints ID: 159769
URI: https://eprints.soton.ac.uk/id/eprint/159769
ISSN: 0028-646X
PURE UUID: 086acd44-5d52-47fa-a66e-d7464942649c
ORCID for Gail Taylor: ORCID iD orcid.org/0000-0001-8470-6390

Catalogue record

Date deposited: 07 Jul 2010 10:22
Last modified: 25 May 2019 00:36

Export record

Altmetrics

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.

×