Talk global, act local: patterning the Arabidopsis embryo

Nawy, T; Lukowitz, W; Bayer, M

doi:10.1016/j.pbi.2007.10.007

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Talk global, act local: patterning the Arabidopsis embryo

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Nawy, T., Lukowitz, W., & Bayer, M. (2005). Talk global, act local: patterning the Arabidopsis embryo. Current Opinion in Plant Biology, 11(1), 28-33. doi:10.1016/j.pbi.2007.10.007.

Cite as: https://hdl.handle.net/21.11116/0000-000F-C56F-7

Abstract

The primary axis and main tissue types of Arabidopsis are laid down in the early embryo. Apical-to-basal auxin flux functions as a global organizer of the axis, and recent reports are clarifying our mechanistic understanding of how a graded auxin distribution is generated and interpreted. Polar targeting of PIN transporters in the cells of the embryo is dynamic and linked to their phosphorylation status, suggesting a flexible mechanism for regulating auxin flux in space and time. PLETHORA transcription factors then interpret the graded auxin distribution to provide positional values along the axis in a dose-dependent manner. A comparable framework for tissue patterning in the radial dimension is still lacking, although cell surface signaling probably plays a key role.