The basic helix-loop-helix transcription factors MYC1 and MYC2 have a dual role in the regulation of constitutive and stress-inducible specialized metabolism in tomato.
Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
/ genetics
Basic Helix-Loop-Helix Transcription Factors
/ metabolism
CRISPR-Associated Protein 9
/ metabolism
Cyclopentanes
/ metabolism
Gene Expression Regulation, Plant
Solanum lycopersicum
/ genetics
Oxylipins
/ metabolism
Polyamines
/ metabolism
Transcription Factors
/ genetics
MYC
CRISPR-Cas9
Solanum lycopersicum (tomato)
cis-regulatory element
jasmonate (JA)
phenylpropanoid-polyamine conjugates
specialized metabolism
steroidal alkaloids
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
11 2022
11 2022
Historique:
received:
31
05
2022
accepted:
08
07
2022
pubmed:
16
7
2022
medline:
12
10
2022
entrez:
15
7
2022
Statut:
ppublish
Résumé
Plants produce specialized metabolites to protect themselves from biotic enemies. Members of the Solanaceae family accumulate phenylpropanoid-polyamine conjugates (PPCs) in response to attackers while also maintaining a chemical barrier of steroidal glycoalkaloids (SGAs). Across the plant kingdom, biosynthesis of such defense compounds is promoted by jasmonate signaling in which clade IIIe basic helix-loop-helix (bHLH) transcription factors play a central role. By characterizing hairy root mutants obtained through Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)-CRISPR associated protein 9 (CRISPR-Cas9) genome editing, we show that the tomato clade IIIe bHLH transcription factors, MYC1 and MYC2, redundantly control jasmonate-inducible PPC and SGA production, and are also essential for constitutive SGA biosynthesis. Double myc1 myc2 loss-of-function tomato hairy roots displayed suppressed constitutive expression of SGA biosynthesis genes, and severely reduced levels of the main tomato SGAs α-tomatine and dehydrotomatine. In contrast, basal expression of genes involved in PPC biosynthesis was not affected. CRISPR-Cas9(VQR) genome editing of a specific cis-regulatory element, targeted by MYC1/2, in the promoter of a SGA precursor biosynthesis gene led to decreased constitutive expression of this gene, but did not affect its jasmonate inducibility. Our results demonstrate that clade IIIe bHLH transcriptional regulators have evolved under the control of distinct regulatory cues to specifically steer constitutive and stress-inducible specialized metabolism.
Substances chimiques
Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
0
Basic Helix-Loop-Helix Transcription Factors
0
Cyclopentanes
0
Oxylipins
0
Polyamines
0
Transcription Factors
0
jasmonic acid
6RI5N05OWW
CRISPR-Associated Protein 9
EC 3.1.-
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
911-928Informations de copyright
© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.
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