Artículos de revistas
Modelling of auxin transport affected by gravity and differential radial growth
Fecha
2006-07-21Registro en:
JOURNAL OF THEORETICAL BIOLOGY Volume: 241 Issue: 2 Pages: 241-251 Published: JUL 21 2006
0022-5193
Autor
Forest, Loïc
Padilla, Fernando
Martínez Salazar, Salomé
Demongeot, Jacques
San Martín Aristegui, Jaime
Institución
Resumen
When a tree stem deviates from verticality, as a result of different environmental factors, patterns of differential radial growth appear. Higher rates of wood production have been observed on the lower side of the tree and lower rates in the opposite side. Biological studies on plant hormones have shown that the concentration of auxin induces radial growth. They also have demonstrated the redistribution of auxin transport in response to gravity. Auxin is then designated as a mediator for differential growth.
This paper presents a model for three-dimensional (3-D) auxin transport in conifer trees, which includes gravity dependence. We obtain realistic heterogeneous patterns of auxin distribution over the tree. Then, we propose a law of growth based on auxin concentration to simulate successive differential radial growths. The predicted growths are compared with experimental results of reconstruction of 3-D annual growth of Radiata pine.