Save your TIRs – more to auxin than meets the eye

Summary Auxin has long been known as an important regulator of plant growth and development. Classical studies in auxin biology have uncovered a ‘canonical’ transcriptional auxin‐signalling pathway involving the TRANSPORT INHIBITOR RESPONSE1/AUXIN SIGNALING F‐BOX (TIR1/AFB) receptors. TIR1/AFB perce...

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Bibliographic Details
Published inThe New phytologist Vol. 238; no. 3; pp. 971 - 976
Main Authors Ang, Aaron Chun Hou, Østergaard, Lars
Format Journal Article
LanguageEnglish
Published England Wiley Subscription Services, Inc 01.05.2023
John Wiley and Sons Inc
Subjects
acid growth
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
auxin
Auxins
Biology
Derepression
F-Box Proteins - genetics
gene expression control
Gene Expression Regulation, Plant
Gene regulation
Indoleacetic Acids - metabolism
nontranscriptional auxin effects
Physiological responses
Plant growth
Plant Growth Regulators - metabolism
Receptors
Repressors
Review
Signal transduction
Signaling
Tansley Insight
acid growth
nontranscriptional auxin effects
auxin
signal transduction
gene expression control
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Summary:Summary Auxin has long been known as an important regulator of plant growth and development. Classical studies in auxin biology have uncovered a ‘canonical’ transcriptional auxin‐signalling pathway involving the TRANSPORT INHIBITOR RESPONSE1/AUXIN SIGNALING F‐BOX (TIR1/AFB) receptors. TIR1/AFB perception of auxin triggers the degradation of repressors and the derepression of auxin‐responsive genes. Nevertheless, the canonical pathway cannot account for all aspects of auxin biology, such as physiological responses that are too rapid for transcriptional regulation. This Tansley insight will explore several ‘non‐canonical’ pathways that have been described in recent years mediating fast auxin responses. We focus on the interplay between a nontranscriptional branch of TIR1/AFB signalling and a TRANSMEMBRANE KINASE1 (TMK1)‐mediated pathway in root acid growth. Other developmental aspects involving the TMKs and their association with the controversial AUXIN‐BINDING PROTEIN 1 (ABP1) will be discussed. Finally, we provide an updated overview of the ETTIN (ETT)‐mediated pathway in contexts outside of gynoecium development.
Bibliography:ObjectType-Article-2
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ObjectType-Review-1
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.18783