Journal Article

PreJuSER-45871

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Primary root growth: a biophysical model of auxin-related control

Chavarria-Krauser, A.FZJ* ; Jäger, W. ; Schurr, U.FZJ*

2005
CSIRO Publ. Collingwood, Victoria

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Please use a persistent id in citations: doi:10.1071/FP05033

Abstract: Plant hormones control many aspects of plant development and play an important role in root growth. Many plant reactions, such as gravitropism and hydrotropism, rely on growth as a driving motor and hormones as signals. Thus, modelling the effects of hormones on expanding root tips is an essential step in understanding plant roots. Here we achieve a connection between root growth and hormone distribution by extending a model of root tip growth, which describes the tip as a string of dividing and expanding cells. In contrast to a former model, a biophysical growth equation relates the cell wall extensibility, the osmotic potential and the yield threshold to the relative growth rate. This equation is used in combination with a refined hormone model including active auxin transport. The model assumes that the wall extensibility is determined by the concentration of a wall enzyme, whose production and degradation are assumed to be controlled by auxin and cytokinin. Investigation of the effects of auxin on the relative growth rate distribution thus becomes possible. Solving the equations numerically allows us to test the reaction of the model to changes in auxin production. Results are validated with measurements found in literature.

Keyword(s): J ; auxin (auto) ; gravitropism (auto) ; hormone (auto) ; model (auto) ; root growth (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Phytosphäre (ICG-III)

Research Program(s):

1. Chemie und Dynamik der Geo-Biosphäre (U01)

Appears in the scientific report 2005

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