Cytokinin and CLE signaling are highly intertwined developmental regulators across tissues and species

•CLE peptide ligands and the hormone cytokinin comprise potent, interactive regulators of plant development.•Comparative analyses support a model for the evolution of conserved, developmental interactions of CLE and cytokinin signaling across wide, phylogenetic distance.•CLE and cytokinin signaling...

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Bibliographic Details
Published in:Current opinion in plant biology 2019-10, Vol.51, p.96-104
Main Authors: Cammarata, Joseph, Roeder, Adrienne HK, Scanlon, Michael J
Format: Article
Language:English
Subjects:
Arabidopsis
Arabidopsis Proteins
Cytokinins
Plant Growth Regulators
Plant Roots
Signal Transduction
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Summary:•CLE peptide ligands and the hormone cytokinin comprise potent, interactive regulators of plant development.•Comparative analyses support a model for the evolution of conserved, developmental interactions of CLE and cytokinin signaling across wide, phylogenetic distance.•CLE and cytokinin signaling confer antagonistic developmental functions in shoot development but act synergistically during root development. The control of cell identity and differentiation is critical for proper development. In plants, cell identity is largely determined by a cell’s spatial context, which is communicated in the form of varying abundances of hormones. Two classes of hormones, the classical phytohormone cytokinin and the small CLE peptide hormones, are potent regulators of cell division and cell differentiation. While a relationship between these two classes of hormones is well-established at developing shoot tips, recent evidence suggests that CLE and cytokinin signaling converge on the same developmental processes across many different contexts and in widely divergent species. Here, we review evidence predominately from Arabidopsis thaliana and the moss Physcomitrella patens that supports a general model where CLE and cytokinin signaling are highly intertwined developmental regulators with antagonistic functions in shoots and synergistic functions in roots.
ISSN:1369-5266
1879-0356
DOI:10.1016/j.pbi.2019.05.006