PLETHORA proteins as dose-dependent master regulators of Arabidopsis root development

Carla Galinha, Hugo Hofhuis, Marijn Luijten, Viola Willemsen, Ikram Blilou, Renze Heidstra and Ben Scheres ()
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Carla Galinha: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Hugo Hofhuis: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Marijn Luijten: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Viola Willemsen: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Ikram Blilou: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Renze Heidstra: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Ben Scheres: Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands

Nature, 2007, vol. 449, issue 7165, 1053-1057

Abstract: A PLETHORA of gradients Polar auxin transport is a factor in almost all developmental processes in plants but there is still much to be learned about how it operates. In cells, directional auxin transport is controlled by the PIN protein carrier complex. A new computational model has been developed to describe diffusion and PIN-facilitated auxin transport in and across the cells of the root system. The model addresses two major issues in plant development. First it supports the concept of an auxin maximum and gradient to guide root growth. Second, it shows how a single molecule can generate a field of information: a concentration gradient across the organ growth zone is closely associated with auxin maxima. A related paper shows that four PLETHORA genes are vital for root development and are candidate output factors for the auxin gradient.

Date: 2007
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DOI: 10.1038/nature06206

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