Modelling phloem and xylem transport within a complex architecture
Modelling phloem and xylem transport within a complex architecture
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DOI：
10.1071/fp08085
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发表时间：
2008-01-01
影响因子：
3
通讯作者：
Minchin, Peter E. H.
中科院分区：
文献类型：
--
作者：
Lacointe, Andre;Minchin, Peter E. H.
植物维管系统的功能，包括韧皮部和木质部，对于所有高等植物的生存至关重要。尽管这两种转运途径所涉及的生理机制已为人所知已有一段时间，但其定量模型的发展却进展缓慢。一维连续模型表明，所提出的机制在数量上是合理的（Thompson 和 Holbrook 2003），但由于数学困难，更复杂的几何形状（架构）仍然无法实现。在这项工作中，我们扩展了 Daudet 等人提出的替代模块化方法。 （2002）使用最近开发的数值工具，使我们能够对复杂的架构进行建模。在对扩展模型进行完整描述之后，我们首先表明，当应用于相同的简单配置时，它可以有效地再现连续方法的结果。然后将该模型应用于具有两个接收器的更复杂的配置，确认接收器优先级是 Munch 流的新兴属性，正如之前在极简模型中发现的那样（Minchin 等人，1993）。进一步表明源叶蒸腾作用如何改变汇之间的相对碳分配率。
The function of the plant's vasculature, incorporating both phloem and xylem, is of fundamental importance to the survival of all higher plants. Although the physiological mechanism involved in these two transport pathways has been known for some time, quantitative modelling of this has been slow to develop. 1-D continuous models have shown that the proposed mechanisms are quantitatively plausible (Thompson and Holbrook 2003) but more complex geometries (architectures) have remained out of reach because of mathematical difficulties. In this work, we extend the alternative modular approach by Daudet et al. (2002) using recently developed numerical tools which allow us to model complex architectures. After a full description of the extended model, we first show that it efficiently reproduces the results of the continuous approach when applied to the same simple configurations. The model is then applied to a more complex configuration with two sinks, confirming that sink priority is an emergent property of the Munch flow as earlier found with a minimalist model (Minchin et al. 1993). It is further shown how source leaf transpiration can change the relative carbon allocation rates among sinks.