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AOBPreview published online on December 21, 2005
Annals of Botany, doi:10.1093/aob/mcj047
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received September 28, 2005
Revised October 27, 2005
Accepted November 21, 2005

Article

A Dynamic Analysis of the Shade-induced Plasticity in Arabidopsis thaliana Rosette Leaf Development Reveals New Components of the Shade-adaptative Response

SARAH JANE COOKSON 1 and CHRISTINE GRANIER 1 *

1 Laboratoire d'Ecophysiologie des Plantes Sous Stress Environnementaux, Institut de Biologie Intégrative des Plantes UMR 759, Institut National de la Recherche Agronomique/Ecole Nationale Supérieure d'Agronomie, 2 Place Viala, 34060 Montpellier Cedex 2, France

* To whom correspondence should be addressed.
CHRISTINE GRANIER, E-mail: granier{at}ensam.inra.fr


  Abstract

• Background and Aims It is well known that plant aerial development is affected by light intensity in terms of the date of flowering, the length of stems and petioles, and the final individual leaf area. The aim of the work presented here was to analyse how shade-induced changes in leaf development occur on a dynamic basis from the whole rosette level to that of the cells.

• Methods Care was taken to ensure that light intensity was the only source of micro-meteorological variation in the study. The dynamics of leaf production, rosette expansion, individual leaf area expansion and epidermal cell expansion were analysed in Arabidopsis thaliana plants grown under two light intensities in three independent experiments.

• Key Results The total area of rosette leaves was reduced by the shading treatment. Both the number of leaves produced and their individual leaf areas were reduced. The reduction in leaf number was associated with a reduction in leaf initiation rate and the duration of the phase of leaf production. The reduction in individual leaf area was associated with a reduction in leaf expansion rate and an increase in the duration of leaf expansion. The changes in leaf expansion dynamics were accompanied by a decrease in epidermal cell number which was partly compensated for by an increase in epidermal cell area. Overall, the whole rosette leaf expansion rate was reduced by shading, whereas the total duration of rosette leaf expansion was unaffected. This was mainly due to the accumulation of the increases in the durations of expansion of each individual leaf which was associated with an increase in cell expansion.

• Conclusions The dynamic analysis presented here reveals a new shade-adaptative response mediated via the control of area expansion at the cell, organ and whole plant levels.

Keywords: Arabidopsis thaliana, light intensity, leaf development, expansion rate, duration, initiation, cell expansion.
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