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RESEARCH ARTICLE
Contents Vol 35(10)

Modelling phloem and xylem transport within a complex architecture

André Lacointe A and Peter E. H. Minchin B C
+ Author Affiliations
- Author Affiliations

A INRA, UMR547 PIAF, F-63100 Clermont-Ferrand, France.

B The Horticulture and Food Research Institute of New Zealand Ltd, 412 No. 1 Road, RD2 Te Puke, New Zealand.

C Corresponding author. Email: pminchin@hortresearch.co.nz

This paper originates from a presentation at the 5th International Workshop on Functional–Structural Plant Models, Napier, New Zealand, November 2007.

Functional Plant Biology 35(10) 772-780 https://doi.org/10.1071/FP08085
Submitted: 18 March 2008  Accepted: 29 July 2008   Published: 11 November 2008

Abstract

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 Münch 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.

Additional keywords: carbon allocation, coupled water and carbon fluxes, functional–structural plant modelling, Münch model, phloem, plant architecture, sink priority, xylem.


Acknowledgements

AL is very grateful for travel support from the International Science and Technology Linkage Fund (contract ISATA07–45) of the New Zealand Ministry of Research, Science and Technology. PEHM was supported by PGSF funding, contract CO6X0706.


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