A functional-structural modelling approach to autoregulation of nodulation

Han, Liqi, Gresshoff, Peter M. and Hanan, Jim (2011) A functional-structural modelling approach to autoregulation of nodulation. Annals of Botany, 107 5: 855-863. doi:10.1093/aob/mcq182


Author Han, Liqi
Gresshoff, Peter M.
Hanan, Jim
Title A functional-structural modelling approach to autoregulation of nodulation
Journal name Annals of Botany   Check publisher's open access policy
ISSN 1095-8290
0305-7364
Publication date 2011-04
Year available 2010
Sub-type Article (original research)
DOI 10.1093/aob/mcq182
Volume 107
Issue 5
Start page 855
End page 863
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2011
Language eng
Formatted abstract
Background and Aims
Autoregulation of nodulation is a long-distance shoot–root signalling regulatory system that regulates nodule meristem proliferation in legume plants. However, due to the intricacy and subtleness of the signalling nature in plants, molecular and biochemical details underlying mechanisms of autoregulation of nodulation remain largely unknown. The purpose of this study is to use functional–structural plant modelling to investigate the complexity of this signalling system. There are two major challenges to be met: modelling the 3D architecture of legume roots with nodulation and co-ordinating signalling-developmental processes with various rates.

Methods
Soybean (Glycine max) was chosen as the target legume. Its root system was observed to capture lateral root branching and nodule distribution patterns. L-studio, a software tool supporting context-sensitive L-system modelling, was used for the construction of the architectural model and integration with the internal signalling.

Key Results
A branching pattern with regular radial angles was found between soybean lateral roots, from which a root mapping method was developed to characterize the laterals. Nodules were mapped based on ‘nodulation section’ to reveal nodule distribution. A root elongation algorithm was then developed for simulation of root development. Based on the use of standard sub-modules, a synchronization algorithm was developed to co-ordinate multi-rate signalling and developmental processes.

Conclusions
The modelling methods developed here not only allow recreation of legume root architecture with lateral branching and nodulation details, but also enable parameterization of internal signalling to produce different regulation results. This provides the basis for using virtual experiments to help in investigating the signalling mechanisms at work.
© The Author 2010.
Keyword Legume
Soybean
Soya bean
Virtual plant
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes First published online: September 7, 2010. Special Issue: Plant Growth Modelling.

 
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Created: Fri, 04 Feb 2011, 14:13:44 EST by Jim Hanan on behalf of Centre for Integrative Legume Research