Abstract
The architecture of many hormone perceptions and signalling pathways has been recently well established, together with an awareness that plant hormone responses are the product of networks of interactions involving multiple hormones. As growth is quantitative, so are hormone responses, which underlie a systems approach to development and response. Auxin is arguably one of the best characterised hormones in plant development, and despite many excellent reviews on auxin perception, polar transport, and signal transduction, too little attention has been given to auxin crosstalk. This review, therefore, gives a précis of recent developments in hormone crosstalk involving auxin. For decades, the literature has described the involvement of multiple hormones in particular processes, although the mechanistic bases underlying points of crosstalk have been harder to pinpoint. Crosstalk falls into different categories, such as direct, indirect, or co-regulation. One conclusion for auxin crosstalk is that crosstalk operates extensively via the metabolism of other hormones, however, microarray approaches are increasingly identifying co-regulated genes and nodes of crosstalk at shared signalling components. Auxin crosstalk is often local, and is spatially and temporally regulated to provide adaptive value to environmental conditions and fine-tuning of responses.
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Abbreviations
- ABA:
-
Abscisic acid
- ARE:
-
Auxin response element
- AUX/IAA:
-
Auxin/IAA repressor protein
- AXR1:
-
AUXIN INSENSITIVE1
- BDL:
-
BODENLOS/IAA12
- BR:
-
Brassinosteroid
- COI1:
-
CORONATINE INSENSITIVE1
- CUL1:
-
CULLIN 1
- DELLA:
-
GRAS transcription factors containing a DELLA amino acid motif
- ECR1:
-
E1 C-TERMINAL RELATED1
- EIN2:
-
ETHYLENE INSENSITIVE2
- EIN3:
-
ETHYLENE INSENSITIVE3
- ET:
-
Ethylene
- GA:
-
Gibberellin
- GA3ox:
-
Gibberellin3 oxidase
- GA20ox:
-
Gibberellin20 oxidase
- HLS1:
-
HOOKLESS1
- IAA:
-
Indole-3-acetic acid
- IAR3:
-
IAA-ALANINE RESISTANT3
- iPMP:
-
Isopentanyladenosine-5′-monophosphate
- IPT:
-
Adenosine isopentanyl transferase
- JA:
-
Jasmonic acid
- JAZ:
-
Jasmonate ZIM-domain proteins
- JR3:
-
JASMONIC RESPONSIVE3
- MeJA:
-
Methyl jasmonate
- PIN1:
-
PINFORMED1
- RGA:
-
REPRESSOR OF GA1-3
- SA:
-
Salicylic acid
- SCF:
-
SKP1/CULLIN/F-BOX UBIQUITIN LIGASE
- SHY2:
-
SHOOT HYPOCOTYL2
- TAA:
-
TRYPTOPHAN AMINO TRANSFERASE
- TIR1:
-
TRANSPORT INHIBITOR RESPONSE1
- UPS:
-
Ubiquitin-26S proteasome system
- WEI8, 12, 17:
-
WEAK ETHYLENE INDUCIBLE 8, 12, 17
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JWC gratefully acknowledges funding from the Deutsche Forschungsgemeinschaft via SFB572 and the anonymous reviewers whose comments improved the quality of this manuscript.
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Chandler, J.W. Auxin as compère in plant hormone crosstalk. Planta 231, 1–12 (2009). https://doi.org/10.1007/s00425-009-1036-x
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DOI: https://doi.org/10.1007/s00425-009-1036-x