A bHLH-Type Transcription Factor, ABA-INDUCIBLE BHLH-TYPE TRANSCRIPTION FACTOR/JA-ASSOCIATED MYC2-LIKE1, Acts as a Repressor to Negatively Regulate Jasmonate Signaling in Arabidopsis
Masaru Nakata,Nobutaka Mitsuda,Marco Herde,Abraham J.K. Koo,Javier E. Moreno,Kaoru Suzuki,Gregg A. Howe,Masaru Ohme-Takagi,Masaru Ohme-Takagi +8 more
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Results indicate that JAM1 negatively regulates JA signaling, thereby playing a pivotal role in fine-tuning of JA-mediated stress responses and plant growth.Abstract:
Jasmonates (JAs) are plant hormones that regulate the balance between plant growth and responses to biotic and abiotic stresses. Although recent studies have uncovered the mechanisms for JA-induced responses in Arabidopsis thaliana, the mechanisms by which plants attenuate the JA-induced responses remain elusive. Here, we report that a basic helix-loop-helix–type transcription factor, ABA-INDUCIBLE BHLH-TYPE TRANSCRIPTION FACTOR/JA-ASSOCIATED MYC2-LIKE1 (JAM1), acts as a transcriptional repressor and negatively regulates JA signaling. Gain-of-function transgenic plants expressing the chimeric repressor for JAM1 exhibited substantial reduction of JA responses, including JA-induced inhibition of root growth, accumulation of anthocyanin, and male fertility. These plants were also compromised in resistance to attack by the insect herbivore Spodoptera exigua. Conversely, jam1 loss-of-function mutants showed enhanced JA responsiveness, including increased resistance to insect attack. JAM1 and MYC2 competitively bind to the target sequence of MYC2, which likely provides the mechanism for negative regulation of JA signaling and suppression of MYC2 functions by JAM1. These results indicate that JAM1 negatively regulates JA signaling, thereby playing a pivotal role in fine-tuning of JA-mediated stress responses and plant growth.read more
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Diverse roles of jasmonates and ethylene in abiotic stress tolerance.
TL;DR: Mechanistic new insights into the mode of action of these hormones in plant abiotic stress tolerance are revealed, which will contribute to the development of crop plants tolerant to a wide range of stressful environments.
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Light regulation of plant defense.
TL;DR: The discovery of connections between photoreceptors and defense signaling is revealing novel mechanisms that control key resource allocation decisions in plant canopies.
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Modularity in Jasmonate Signaling for Multistress Resilience.
TL;DR: This work reviews the jasmonate signaling pathway with an emphasis on understanding how transcriptional responses are specific, tunable, and evolvable and explores emerging evidence that JAZ proteins integrate multiple informational cues and mediate crosstalk by propagating changes in protein-protein interaction networks.
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Jasmonate action in plant growth and development
TL;DR: Since the 1980s, details of the JA biosynthesis pathway, signaling pathway, and crosstalk during plant growth and development have been elucidated.
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How salicylic acid takes transcriptional control over jasmonic acid signaling.
TL;DR: An overview of how salicylic acid can control transcriptional reprogramming of JA-induced genes in Arabidopsis thaliana is given.
References
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Journal ArticleDOI
JAZ repressor proteins are targets of the SCF COI1 complex during jasmonate signalling
Bryan Thines,Leron Katsir,Maeli Melotto,Yajie Niu,Ajin Mandaokar,Guanghui Liu,Kinya Nomura,Sheng Yang He,Gregg A. Howe,John Browse +9 more
TL;DR: The results suggest a model in which jasmonate ligands promote the binding of the SCFCOI1 ubiquitin ligase to and subsequent degradation of the JAZ1 repressor protein, and implicate theSCFCOi1–JAZ1 protein complex as a site of perception of the plant hormone JA–Ile.
Journal ArticleDOI
The JAZ family of repressors is the missing link in jasmonate signalling
Andrea Chini,Sandra Fonseca,Guillermo Fernández,Bruce Adie,José-Manuel Chico,Oscar Lorenzo,Gloria García-Casado,Irene López-Vidriero,Francisca María Lozano,María Rosa Ponce,José Luis Micol,Roberto Solano +11 more
TL;DR: The identification of JASMONATE-INSENSITIVE 3 (JAI3) and a family of related proteins named JAZ (jasmonate ZIM-domain), in Arabidopsis thaliana and the existence of a regulatory feed-back loop involving MYC2 and JAZ proteins, which provides a mechanistic explanation for the pulsed response to jasmonate and the subsequent desensitization of the cell.
Journal ArticleDOI
Jasmonates: An Update on Biosynthesis, Signal Transduction and Action in Plant Stress Response, Growth and Development
TL;DR: This review summarizes biosynthesis and signal transduction of jasmonates with emphasis on new findings in relation to enzymes, their crystal structure, new compounds detected in the oxylipin andJasmonate families, and newly found functions.
Journal ArticleDOI
COI1: An Arabidopsis Gene Required for Jasmonate-Regulated Defense and Fertility
TL;DR: The coi1 mutation defines an Arabidopsis gene required for response to jasmonates, which regulate defense against insects and pathogens, wound healing, and pollen fertility as mentioned in this paper.
Journal ArticleDOI
ETHYLENE RESPONSE FACTOR1 Integrates Signals from Ethylene and Jasmonate Pathways in Plant Defense
TL;DR: The results suggest that ERF1 acts downstream of the intersection between ethylene and jasmonate pathways and suggest that this transcription factor is a key element in the integration of both signals for the regulation of defense response genes.
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