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MYC2 Differentially Modulates Diverse Jasmonate-Dependent Functions in Arabidopsis

Bruno Dombrecht, Gang Ping Xue, Susan J. Sprague, John A. Kirkegaard, John J. Ross, James B. Reid, Gary P. Fitt, Nasser Sewelam, Peer M. Schenk, John M. Manners, Kemal Kazan
Bruno Dombrecht
Commonwealth Scientific and Industrial Research Organization Plant Industry, Queensland Bioscience Precinct, St. Lucia, Queensland, 4067, Australia
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Gang Ping Xue
Commonwealth Scientific and Industrial Research Organization Plant Industry, Queensland Bioscience Precinct, St. Lucia, Queensland, 4067, Australia
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Susan J. Sprague
Commonwealth Scientific and Industrial Research Organization Plant Industry, Canberra, Australian Capital Territory, 2601, Australia
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John A. Kirkegaard
Commonwealth Scientific and Industrial Research Organization Plant Industry, Canberra, Australian Capital Territory, 2601, Australia
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John J. Ross
School of Plant Science, University of Tasmania, Hobart, Tasmania, 7001, Australia
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James B. Reid
School of Plant Science, University of Tasmania, Hobart, Tasmania, 7001, Australia
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Gary P. Fitt
Commonwealth Scientific and Industrial Research Organization Entomology, Long Pocket Laboratories, Indooroopilly, Queensland, 4068, Australia
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Nasser Sewelam
Commonwealth Scientific and Industrial Research Organization Plant Industry, Queensland Bioscience Precinct, St. Lucia, Queensland, 4067, AustraliaSchool of Integrative Biology, University of Queensland, St. Lucia, Queensland, 4072, Australia
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Peer M. Schenk
School of Integrative Biology, University of Queensland, St. Lucia, Queensland, 4072, Australia
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John M. Manners
Commonwealth Scientific and Industrial Research Organization Plant Industry, Queensland Bioscience Precinct, St. Lucia, Queensland, 4067, Australia
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Kemal Kazan
Commonwealth Scientific and Industrial Research Organization Plant Industry, Queensland Bioscience Precinct, St. Lucia, Queensland, 4067, Australia
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Published July 2007. DOI: https://doi.org/10.1105/tpc.106.048017

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Abstract

The Arabidopsis thaliana basic helix-loop-helix Leu zipper transcription factor (TF) MYC2/JIN1 differentially regulates jasmonate (JA)-responsive pathogen defense (e.g., PDF1.2) and wound response (e.g., VSP) genes. In this study, genome-wide transcriptional profiling of wild type and mutant myc2/jin1 plants followed by functional analyses has revealed new roles for MYC2 in the modulation of diverse JA functions. We found that MYC2 negatively regulates Trp and Trp-derived secondary metabolism such as indole glucosinolate biosynthesis during JA signaling. Furthermore, MYC2 positively regulates JA-mediated resistance to insect pests, such as Helicoverpa armigera, and tolerance to oxidative stress, possibly via enhanced ascorbate redox cycling and flavonoid biosynthesis. Analyses of MYC2 cis binding elements and expression of MYC2-regulated genes in T-DNA insertion lines of a subset of MYC2–regulated TFs suggested that MYC2 might modulate JA responses via differential regulation of an intermediate spectrum of TFs with activating or repressing roles in JA signaling. MYC2 also negatively regulates its own expression, and this may be one of the mechanisms used in fine-tuning JA signaling. Overall, these results provide new insights into the function of MYC2 and the transcriptional coordination of the JA signaling pathway.

  • Received October 10, 2006.
  • Revised May 20, 2007.
  • Accepted June 9, 2007.
  • Published July 6, 2007.
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MYC2 Differentially Modulates Diverse Jasmonate-Dependent Functions in Arabidopsis
Bruno Dombrecht, Gang Ping Xue, Susan J. Sprague, John A. Kirkegaard, John J. Ross, James B. Reid, Gary P. Fitt, Nasser Sewelam, Peer M. Schenk, John M. Manners, Kemal Kazan
The Plant Cell Jul 2007, 19 (7) 2225-2245; DOI: 10.1105/tpc.106.048017

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MYC2 Differentially Modulates Diverse Jasmonate-Dependent Functions in Arabidopsis
Bruno Dombrecht, Gang Ping Xue, Susan J. Sprague, John A. Kirkegaard, John J. Ross, James B. Reid, Gary P. Fitt, Nasser Sewelam, Peer M. Schenk, John M. Manners, Kemal Kazan
The Plant Cell Jul 2007, 19 (7) 2225-2245; DOI: 10.1105/tpc.106.048017
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The Plant Cell Online: 19 (7)
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Vol. 19, Issue 7
July 2007
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