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Title: CPR5 modulates salicylic acid and the unfolded protein response to manage tradeoffs between plant growth and stress responses

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.13397· OSTI ID:1596279
 [1];  [2];  [3];  [2]
  1. Michigan State Univ., East Lansing, MI (United States); China Agricultural Univ., Beijing (China)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. China Agricultural Univ., Beijing (China)

We report that completion of a plant's life cycle depends on successful prioritization of signaling favoring either growth or defense. Although hormones are pivotal regulators of growth-defense tradeoffs, the underlying signaling mechanisms remain obscure. The unfolded protein response (UPR) is essential for physiological growth as well as management of endoplasmic reticulum (ER) stress in unfavorable growth conditions. The plant UPR transducers are the kinase and ribonuclease IRE1 and the transcription factors bZIP28 and bZIP60. We analyzed management of the tradeoff between growth and ER stress defense by the stress response hormone salicylic acid (SA) and the UPR, which is modulated by SA via unknown mechanisms. We show that the plant growth and stress regulator CPR5, which represses accumulation of SA, favors growth in physiological conditions through inhibition of the SA-dependent IRE1-bZIP60 arm that antagonizes organ growth; CPR5 also favors growth in stress conditions through repression of ER stress-induced bZIP28/IRE1-bZIP60 arms. By demonstrating a physical interaction of CPR5 with bZIP60 and bZIP28, we provide mechanistic insights into CPR5-mediated modulation of UPR signaling. In conclusion, these findings define a critical surveillance strategy for plant growth-ER stress defense tradeoffs based on CPR5 and SA-modulated UPR signaling, whereby CPR5 acts as a positive modulator of growth in physiological conditions and in stress by antagonizing SA-dependent growth inhibition through UPR modulation.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Institutes of Health (NIH)
Grant/Contract Number:
FG02-91ER20021; GM101038
OSTI ID:
1596279
Alternate ID(s):
OSTI ID: 1401716
Journal Information:
The Plant Journal, Vol. 89, Issue 3; ISSN 0960-7412
Publisher:
Society for Experimental BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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AtIRE1C, an unconventional isoform of the UPR master regulator AtIRE1, is functionally associated with AtIRE1B in Arabidopsis gametogenesis journal November 2019
Genomic basis of European ash tree resistance to ash dieback fungus journal November 2019
Putative alternative translation start site-encoding nucleotides of CPR5 regulate growth and resistance journal June 2020
A high-throughput screening method to identify proteins involved in unfolded protein response of the endoplasmic reticulum in plants journal January 2020
Unfolded protein-independent IRE1 activation contributes to multifaceted developmental processes in Arabidopsis journal October 2019
Endoplasmic Reticulum Plays a Critical Role in Integrating Signals Generated by Both Biotic and Abiotic Stress in Plants journal April 2019
The Multifaceted Roles of Plant Hormone Salicylic Acid in Endoplasmic Reticulum Stress and Unfolded Protein Response journal November 2019
Protein Quality Control in Plant Organelles: Current Progress and Future Perspectives journal January 2021
NAA50 Is an Enzymatically Active Nα-Acetyltransferase That Is Crucial for Development and Regulation of Stress Responses journal May 2020