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Signal integration by GSK3 kinases in the root
Carlos S Galvan-Ampudia1, Teva Vernoux1
1Laboratoire de Reproduction et Développement des Plantes, CNRS, INRA, ENS Lyon, UCBL, Université de Lyon, 69364 Lyon, France.
Nature Cell Biology
|December 25, 2013
Summary
Plant development relies on signal integration. A TDIF peptide pathway activates auxin signaling independently of auxin by phosphorylating ARF transcription factors via GSK3 kinases during lateral root initiation.
Area of Science:
- Plant biology
- Developmental biology
- Molecular signaling
Background:
- Plant development involves intricate signal integration for pattern formation.
- Lateral root initiation is a key developmental process regulated by hormonal signaling pathways.
Discussion:
- The TDIF peptide, secreted by phloem, plays a crucial role in lateral root development.
- This peptide triggers auxin signaling independently of auxin itself, highlighting a novel regulatory mechanism.
Key Insights:
- The TDIF peptide activates the auxin signaling pathway through the phosphorylation of Auxin Response Factor (ARF) transcription factors.
- GSK3 (Shaggy-like) kinases are identified as the key enzymes mediating this phosphorylation event.
Outlook:
- Further research can elucidate the precise molecular interactions between TDIF, GSK3, and ARFs.
- Understanding this pathway could offer new targets for modulating plant architecture and root system development.
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