Jaffuel Sylvie, Dauzat Jean
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.
Ann Bot. 2005 Feb;95(3):401-12. doi: 10.1093/aob/mci043. Epub 2004 Dec 15.
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.
An indica cultivar of rice, 'Ir64', glasshouse-grown (25/20 degrees 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.
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.
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.
分蘖是估算产量的一个重要因素，但以往的研究很少同时涉及分蘖在时间和空间上的变化。本研究基于分蘖的拓扑位置、出现时间和主茎发育阶段，分析了每个分蘖的形态及其发育动态。
以温室（25/20摄氏度，12小时光周期）种植的籼稻品种‘IR64’为材料，从第三叶期至抽穗期观察各茎轴的发生、物候和形态。
分蘖的结构和形态特征变异较小，水稻群体呈现出层次性。叶片长度最初随叶位增加，而后最后三片叶急剧下降。每个茎轴的节数随分枝顺序和叶位而减少。植株动态分析表明，直至开花，主茎和分蘖上的叶片同步出现。腋芽发育成分蘖取决于其拓扑位置和植株发育阶段。
开花分蘖的时间和频率符合优先规则，取决于其顺序、叶位和出现时间。对禾本科植物拓扑结构的精确描述是一种有用的工具，可用于根据生长条件，从位置、结构和命运方面量化生长事件并预测分蘖。
