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AOBPreview originally published online on December 15, 2004
Annals of Botany 2005 95(3):401-412; doi:10.1093/aob/mci043
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Annals of Botany 95/3 © Annals of Botany Company 2004; all rights reserved

Synchronism of Leaf and Tiller Emergence Relative to Position and to Main Stem Development Stage in a Rice Cultivar

SYLVIE JAFFUEL* and JEAN DAUZAT

Unité Mixte Cirad-Cnrs-Inra-Ird-Université Montpellier 2, Botanique et Bioinformatique de l'Architecture des Plantes (AMAP), TA40/PS2, Boulevard de la Lironde, 34398 Montpellier Cedex 5, France

* For correspondence. E-mail jaffuel{at}cirad.fr

Received: 28 June 2004    Returned for revision: 24 August 2004    Accepted: 20 October 2004    Published electronically: 15 December 2004

• Background and Aims Tillering is an essential factor when estimating yield, but investigations rarely include both the temporal and spatial changes that occur in tillers. This study analyses the morphology and development dynamics of each tiller, based on its topological location, the timing of appearance and main stem development stage.

• Methods An indica cultivar of rice, ‘Ir64’, glasshouse-grown (25/20 °C, 12 h photoperiod), was used to examine the emergence, phenology and morphology of each axis starting at the third leaf stage up to heading.

• Key Results Little variability was observed in the structural and morphological characteristics of the tillers, and the rice population appeared to be hierarchical. Blade length initially increased with leaf rank and then decreased sharply for the last three leaves. The number of phytomers per axis decreased with branching order and rank. An analysis of plant dynamics showed synchronous emergence of the leaves on the main stem and on the tillers up to flowering. Axillary bud development into tillers depended on their topological location and plant developmental stage.

• Conclusions The timing and frequency of flowering tillers complied with rules of priority depending on their order, rank and emergence time. Precise description of plant topology in grasses is a useful tool that can be used to quantify growth events and predict tillering in terms of location, structure and fate according to growing conditions.

Key words: Oryza sativa L., rice, tillering, phyllochron, ontogeny, synchrony, development dynamics, tiller flowering


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