Abstract

Clarifying the endogenous processes that construct gross aerial shapes such as branching architecture in plants is crucial to understanding how branching contributes to plant adaptation to environments. Architectural analysis is powerful in decomposing the branching process, by comparing observations of plant growth among closely related taxa. The genus Sasa (Gramineae: Bambusoideae) contains three major sections Crassinodi, Sasa and Macrochlamys. These sections exhibit characteristic branching architectures and are distributed separately across the Japanese archipelago, in relation to macroclimatic conditions such as snow accumulation. Our study aimed to quantitatively reveal the endogenous processes underlying branching architectures in the three sections of Sasa. Long-term observations were carried out branch architectural development on Hokkaido Island from 1979 to 2012, which corresponded to the flowering interval of the genus. The results revealed that the three characteristic branching systems of the genus arise mainly from four endogenous processes (distribution of lateral buds on a culm, internode length arrangement along a culm, determination of the fate of lateral buds, development of branching with culm fragility due to ageing) and their interactions with environmental conditions, especially snow accumulation. These processes are coordinated with each other over the life span of a single shoot in developing branching architecture.

中文翻译：

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长期观测揭示竹亚科竹属竹属分枝系统的形成过程

 抽象的

阐明构建总体空中形状（例如植物的分枝结构）的内源过程对于理解分枝如何促进植物适应环境至关重要。通过比较密切相关的分类群之间的植物生长观察结果，架构分析在分解分支过程方面非常有效。笹属（禾本科：竹亚科）包含三个主要部分： Crassinodi 、 Sasa和Macrochlamys。这些部分表现出特有的分支结构，并分别分布在日本列岛，与积雪等宏观气候条件有关。我们的研究旨在定量揭示Sasa三个部分分支结构的内生过程。 1979年至2012年在北海道岛进行了分支结构发育的长期观察，这与该属的开花间隔相对应。结果表明，该属的三个特征分枝系统主要源于四个内生过程（茎上侧芽的分布、沿茎的节间长度排列、侧芽命运的决定、由于茎脆弱而导致分枝的发育）。老化）及其与环境条件的相互作用，特别是积雪。这些过程在发育分支结构的单个芽的生命周期中相互协调。