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Title: Regulation of growth-defense balance by the JASMONATE ZIM-DOMAIN (JAZ)-MYC transcriptional module

The plant hormone jasmonate (JA) promotes the degradation of JASMONATE ZIM-DOMAIN (JAZ) proteins to relieve repression on diverse transcription factors (TFs) that execute JA responses. However, little is known about how combinatorial complexity among JAZ–TF interactions maintains control over myriad aspects of growth, development, reproduction, and immunity. We used loss-of-function mutations to define epistatic interactions within the core JA signaling pathway and to investigate the contribution of MYC TFs to JA responses in Arabidopsis thaliana. Constitutive JA signaling in a jaz quintuple mutant (jazQ) was largely eliminated by mutations that block JA synthesis or perception. Comparison of jazQ and a jazQ myc2 myc3 myc4 octuple mutant validated known functions of MYC2/3/4 in root growth, chlorophyll degradation,and susceptibility to the pathogen Pseudomonas syringae. We found that MYC TFs also control both the enhanced resistance of jazQ leaves to insect herbivory and restricted leaf growth of jazQ. Epistatic transcriptional profiles mirrored these phenotypes and further showed that triterpenoid biosynthetic and glucosinolate catabolic genes are up-regulated in jazQ independently of MYC TFs. Lastly, our study highlights the utility of genetic epistasis to unravel the complexities of JAZ–TF interactions and demonstrates that MYC TFs exert master control over a JAZ-repressible transcriptional hierarchy that governsmore » growth–defense balance.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3]
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Energy-Plant Research Lab.
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Energy-Plant Research Lab.; Michigan State Univ., East Lansing, MI (United States). Dept. of Plant Biology; Michigan State Univ., East Lansing, MI (United States). Howard Hughes Medical Inst.; Michigan State Univ., East Lansing, MI (United States). Plant Resilience Inst.
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Energy-Plant Research Lab.; Michigan State Univ., East Lansing, MI (United States). Plant Resilience Inst.; Michigan State Univ., East Lansing, MI (United States). Dept. of Biochemistry and Molecular Biology
Publication Date:
Grant/Contract Number:
FG02-91ER20021
Type:
Accepted Manuscript
Journal Name:
New Phytologist
Additional Journal Information:
Journal Volume: 215; Journal Issue: 4; Journal ID: ISSN 0028-646X
Publisher:
Wiley
Research Org:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Institutes of Health (NIH); Japan Society for Promotion of Science Research; Brazilian National Council for Scientific and Technological Development
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; gene cluster; glucosinolate; growth–defense tradeoffs; jasmonate (JA); plant defense; plant hormone; plant–insect interaction; triterpenoid.
OSTI Identifier:
1425392