Auxin Controls Arabidopsis Adventitious Root Initiation by Regulating Jasmonic Acid Homeostasis
Laurent Gutierrez,Gaëlle Mongelard,Kristýna Floková,Daniel Ioan Pacurar,Ondřej Novák,Ondřej Novák,Paul E. Staswick,Mariusz Kowalczyk,Monica Lacramioara Pacurar,Monica Lacramioara Pacurar,Hervé Demailly,Gaia Geiss,Catherine Bellini,Catherine Bellini +13 more
TL;DR: A model in which adventitious rooting is an adaptive developmental response involving crosstalk between the auxin and jasmonate regulatory pathways is proposed.
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Abstract: Vegetative shoot-based propagation of plants, including mass propagation of elite genotypes, is dependent on the development of shoot-borne roots, which are also called adventitious roots. Multiple endogenous and environmental factors control the complex process of adventitious rooting. In the past few years, we have shown that the auxin response factors ARF6 and ARF8, targets of the microRNA miR167, are positive regulators of adventitious rooting, whereas ARF17, a target of miR160, is a negative regulator. We showed that these genes have overlapping expression profiles during adventitious rooting and that they regulate each other's expression at the transcriptional and posttranscriptional levels by modulating the homeostasis of miR160 and miR167. We demonstrate here that this complex network of transcription factors regulates the expression of three auxin-inducible Gretchen Hagen3 (GH3) genes, GH3.3, GH3.5, and GH3.6, encoding acyl-acid-amido synthetases. We show that these three GH3 genes are required for fine-tuning adventitious root initiation in the Arabidopsis thaliana hypocotyl, and we demonstrate that they act by modulating jasmonic acid homeostasis. We propose a model in which adventitious rooting is an adaptive developmental response involving crosstalk between the auxin and jasmonate regulatory pathways.
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Citations
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References
The role of JAR1 in Jasmonoyl-l-isoleucine production during Arabidopsis wound response
Walter P. Suza,Paul E. Staswick +1 more
TL;DR: The results suggest that the rapid increase in JA–Ile mediated by the JAR1 enzyme plays only a minor role in transcriptional modulation of genes induced by mechanical wounding.
An Arabidopsis GH3 Gene, Encoding an Auxin-Conjugating Enzyme, Mediates Phytochrome B-Regulated Light Signals in Hypocotyl Growth
TL;DR: Support is provided for WES1 regulating hypocotyl growth by mediating phytochrome B-perceived light signals by up-regulated in a phy tochrome B mutant.
A conditionally fertile coi1 allele indicates cross-talk between plant hormone signalling pathways in Arabidopsis thaliana seeds and young seedlings.
Christine Ellis,John Turner +1 more
TL;DR: This work has used coi1-16 seeds to define novel interactions between JA and other hormone signalling pathways in seed germination and in the development of young seedlings.
Regulation and Function of Arabidopsis JASMONATE ZIM-Domain Genes in Response to Wounding and Herbivory
Hoo Sun Chung,Abraham J.K. Koo,Xiaoli Gao,Sastry S. Jayanty,Bryan Thines,A. Daniel Jones,Gregg A. Howe +6 more
TL;DR: A role for JAZ proteins in the regulation of plant anti-insect defense is established, and the hypothesis that JA-Ile and perhaps other JA derivatives activate COI1-dependent wound responses in Arabidopsis is supported.
Arabidopsis GH3.5 regulates salicylic acid-dependent and both NPR1-dependent and independent defense responses
TL;DR: In this paper, the role and mechanism of GH3.5 involved in the SA-dependent defense pathway was further studied, and it was shown that the GH3 gene acts as a bifunctional modulator of the salicylic acid (SA)-mediated resistance and the auxin-mediated susceptibility during the Arabidopsis-Pseudomonas syringae interaction.