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Noncanonical Auxin Signaling.
Heather Marie McLaughlin1, Aaron Chun Hou Ang1, Lars Østergaard1
1Crop Genetics Department, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, United Kingdom.
Cold Spring Harbor Perspectives in Biology
|January 12, 2021
Summary
This review explores noncanonical auxin signaling pathways in plants. It highlights alternative mechanisms beyond the standard pathway, including those involving animal hormone signaling and plasma membrane perception, to understand plant growth regulation.
Area of Science:
- Plant Biology
- Molecular Biology
- Hormone Signaling
Background:
- Auxin is a key plant hormone regulating growth and development across all scales.
- Canonical auxin signaling involves derepression of genes via transcriptional repressor degradation.
- Existing knowledge on auxin signaling primarily focuses on this well-established canonical pathway.
Purpose of the Study:
- To review and discuss current understanding of noncanonical auxin signaling pathways.
- To identify and analyze alternative mechanisms of auxin perception and signal transduction.
- To highlight unresolved questions and future research directions in auxin biology.
Main Methods:
- Literature review and synthesis of existing research on auxin signaling.
- Comparative analysis of canonical and noncanonical auxin signaling mechanisms.
- Discussion of identified noncanonical pathways, including those resembling animal hormone signaling and plasma membrane-initiated responses.
Main Results:
- Identification of noncanonical auxin signaling pathways distinct from the canonical ubiquitin-mediated degradation mechanism.
- Description of pathways involving gene regulation similar to animal hormone signaling.
- Evidence for auxin perception at the plasma membrane leading to transcriptional changes via repressor stabilization.
Conclusions:
- Noncanonical auxin signaling pathways are crucial for specific plant growth and developmental processes.
- The precise perception mechanisms and receptors for some noncanonical pathways remain to be elucidated.
- Further research is needed to fully understand the complexity and diversity of auxin signaling in plants.
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