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From perception to attenuation: auxin signalling and responses.
1Department of Environmental Science and Technology, University of Maryland, 5138 Plant Science Building, College Park, MD 20742, USA; Department of Plant Science and Landscape Architecture, University of Maryland, 5138 Plant Science Building, College Park, MD 20742, USA.
Current Opinion in Plant Biology
|September 6, 2013
Summary
Plant hormone auxin is crucial for growth. New research reveals peripheral auxin perception and non-transcriptional signaling, challenging previous models and linking auxin to cell cycle regulation.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- The plant hormone auxin regulates numerous growth and developmental processes.
- Traditional auxin signaling models emphasize intracellular perception via TIR1/AFB-Aux/IAA co-receptors.
- Recent findings suggest peripheral auxin perception mechanisms are also critical.
Purpose of the Study:
- To re-examine the established paradigm of auxin perception.
- To explore non-transcriptional auxin signaling pathways.
- To integrate new findings into the understanding of auxin's role in plant development and homeostasis.
Main Methods:
- Investigated the role of Auxin Binding Protein 1 (ABP1) in auxin signaling.
- Characterized the auxin-binding properties of the F-box protein SKP2a.
- Examined the regulation of auxin transport proteins (PIN-FORMED carriers) by D6 PROTEIN KINASE and ROP-GTPase.
- Studied the localization of auxin carriers in the endoplasmic reticulum.
Main Results:
- Auxin Binding Protein 1 mediates non-transcriptional auxin signaling at the cell periphery.
- SKP2a binds auxin, linking auxin to cell cycle regulation.
- D6 PROTEIN KINASE and ROP-GTPase pathways are involved in PIN carrier activation and localization.
- Auxin carriers, including PIN and PIN-LIKES, are localized to the endoplasmic reticulum.
Conclusions:
- Auxin perception is not exclusively intracellular; peripheral signaling pathways are significant.
- Auxin plays a role in cell cycle regulation through F-box proteins like SKP2a.
- Complex regulatory networks involving kinases, GTPases, and protein localization govern auxin transport and homeostasis.
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