Distinct branches of the N‐end rule pathway modulate the plant immune response. Issue 2 (17th August 2018)

• Record Type: Journal Article
• Authors: Vicente, Jorge; Mendiondo, Guillermina M.; Pauwels, Jarne; Pastor, Victoria; Izquierdo, Yovanny; Naumann, Christin; Movahedi, Mahsa; Rooney, Daniel; Gibbs, Daniel J.; Smart, Katherine; Bachmair, Andreas; Gray, Julie E.; Dissmeyer, Nico; Castresana, Carmen; Ray, Rumiana V.; Gevaert, Kris; Holdsworth, Michael J.
• Is Part Of: New phytologist. Volume 221:Issue 2(2019)
• Page Start: 988
• Page End: 1000
• Publication Date: 2018-08-17
• Subjects: amino‐terminal glutamine amidase -- Group VII Ethylene Response Factor transcription factor -- N‐end rule pathway -- plant immunity -- proteostasis; Botany -- Periodicals; 580
• DOI: 10.1111/nph.15387
• Languages: English
• ISSNs: 0028-646X

Abstract

Summary: The N‐end rule pathway is a highly conserved constituent of the ubiquitin proteasome system, yet little is known about its biological roles. Here we explored the role of the N‐end rule pathway in the plant immune response. We investigated the genetic influences of components of the pathway and known protein substrates on physiological, biochemical and metabolic responses to pathogen infection. We show that the glutamine (Gln) deamidation and cysteine (Cys) oxidation branches are both components of the plant immune system, through the E3 ligase PROTEOLYSIS (PRT)6. In Arabidopsis thaliana Gln‐specific amino‐terminal (Nt)‐amidase (NTAQ1) controls the expression of specific defence‐response genes, activates the synthesis pathway for the phytoalexin camalexin and influences basal resistance to the hemibiotroph pathogen Pseudomonas syringae pv tomato ( Pst ). The Nt‐Cys ETHYLENE RESPONSE FACTOR VII transcription factor substrates enhance pathogen‐induced stomatal closure. Transgenic barley with reduced HvPRT6 expression showed enhanced resistance to Ps. japonica and Blumeria graminis f. sp. hordei, indicating a conserved role of the pathway. We propose that that separate branches of the N‐end rule pathway act as distinct components of the plant immune response in flowering plants.