Mixing and matching pathways in leaf polarity

Leaves extend a large, porous surface to the environment to catch light and exchange gasses. The extension of the lamina is produced by the interaction of an upper (adaxial) and a lower (abaxial) domain in the developing leaf primordium. Recent studies have revealed that conserved genetic pathways,...

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Bibliographic Details
Published in:Current opinion in plant biology 2007-02, Vol.10 (1), p.13-20
Main Authors: Kidner, Catherine A, Timmermans, Marja CP
Format: Article
Language:English
Subjects:
Arabidopsis - cytology
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - metabolism
Arabidopsis thaliana
gene expression regulation
leaf development
leaf initiation
leaf polarity
literature reviews
Plant Leaves - cytology
Plant Leaves - genetics
Plant Leaves - growth & development
Plant Leaves - metabolism
plants
RNA
RNA Interference
small regulatory RNA
Species Specificity
transcription factors
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Summary:Leaves extend a large, porous surface to the environment to catch light and exchange gasses. The extension of the lamina is produced by the interaction of an upper (adaxial) and a lower (abaxial) domain in the developing leaf primordium. Recent studies have revealed that conserved genetic pathways, involving small regulatory RNAs and several distinct transcription factor families, have key roles in adaxial–abaxial patterning, suggesting candidate signals that convey positional information within the shoot to the newly initiated leaf. The interactions of the polarity pathways are distinguished by mutual antagonism and by redundancies. Analysis of these pathways in different model organisms reveals a surprising diversity in the genetic control of such a fundamental developmental process.
ISSN:1369-5266
1879-0356
DOI:10.1016/j.pbi.2006.11.013