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000045871 0247_ $$2DOI$$a10.1071/FP05033
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000045871 084__ $$2WoS$$aPlant Sciences
000045871 1001_ $$0P:(DE-Juel1)VDB33618$$aChavarria-Krauser, A.$$b0$$uFZJ
000045871 245__ $$aPrimary root growth: a biophysical model of auxin-related control
000045871 260__ $$aCollingwood, Victoria$$bCSIRO Publ.$$c2005
000045871 300__ $$a849 - 862
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000045871 440_0 $$09141$$aFunctional Plant Biology$$v32$$x1445-4408$$y9
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000045871 520__ $$aPlant hormones control many aspects of plant development and play an important role in root growth. Many plant reactions, such as gravitropism and hydrotropism, rely on growth as a driving motor and hormones as signals. Thus, modelling the effects of hormones on expanding root tips is an essential step in understanding plant roots. Here we achieve a connection between root growth and hormone distribution by extending a model of root tip growth, which describes the tip as a string of dividing and expanding cells. In contrast to a former model, a biophysical growth equation relates the cell wall extensibility, the osmotic potential and the yield threshold to the relative growth rate. This equation is used in combination with a refined hormone model including active auxin transport. The model assumes that the wall extensibility is determined by the concentration of a wall enzyme, whose production and degradation are assumed to be controlled by auxin and cytokinin. Investigation of the effects of auxin on the relative growth rate distribution thus becomes possible. Solving the equations numerically allows us to test the reaction of the model to changes in auxin production. Results are validated with measurements found in literature.
000045871 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000045871 650_7 $$2WoSType$$aJ
000045871 65320 $$2Author$$aauxin
000045871 65320 $$2Author$$agravitropism
000045871 65320 $$2Author$$ahormone
000045871 65320 $$2Author$$amodel
000045871 65320 $$2Author$$aroot growth
000045871 7001_ $$0P:(DE-HGF)0$$aJäger, W.$$b1
000045871 7001_ $$0P:(DE-Juel1)129402$$aSchurr, U.$$b2$$uFZJ
000045871 773__ $$0PERI:(DE-600)1496158-1$$a10.1071/FP05033$$gVol. 32, p. 849 - 862$$p849 - 862$$q32<849 - 862$$tFunctional plant biology$$v32$$x1445-4408$$y2005
000045871 8567_ $$uhttp://dx.doi.org/10.1071/FP05033
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000045871 9141_ $$y2005
000045871 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
000045871 9201_ $$0I:(DE-Juel1)VDB49$$d31.12.2006$$gICG$$kICG-III$$lPhytosphäre$$x0
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