Author

Alexis Maizel

Additional Author(s): Mouli Ghosh Dastidar and Virginie Jouannet

Published on SDB CoRe: Feb 28 2012

Signaling: Hormone Signaling
Plant Organs: Roots; Meristems
Stem Cells: Meristems
Organism: Arabidopsis
Stage of Development: Adult

Object Description

Spatiotemporal organization of lateral root formation in Arabidopsis thaliana. The basic organization of the plant root system consists of an embryo-derived primary root and post-embryonically formed secondary and higher order roots. Arabidopsis lateral root formation is a complex developmental process, as each lateral root contains its own meristem that must be specified and activated. Lateral roots originate rhythmically from pericycle founder cells in the basal meristem. A well-supported model for this step depends on auxin fluxes coming from the root meristem. As the primary root further develops, the primed pericycle cells are displaced farther away from the root meristem and a second burst of auxin, derived from the shoot, triggers the initiation of the lateral root. This initiation begins with several rounds of divisions of the primed pericycle cells, resulting in a single layered primordium. These cells then divide, creating a dome-shaped primordium that will emerge from the parental root. Although these steps occur sequentially along the primary root, they can be interrupted. WIREs Dev Biol. 2011. DOI: 10.1002/wdev.17

References

Dastidar, M.G., Jouannet, V., Maizel, A. Root branching: mechanisms, robustness, and plasticity. WIREs Dev Biol, Published Online: Dec 08 2011 DOI: 10.1002/wdev.17

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