Preprint Article Version 1 This version is not peer-reviewed

EFR-Mediated Innate Immune Response in ER α–Glucosidase II rsw3 and UGGT uggt1-1 Arabidopsis thaliana Mutants

Version 1 : Received: 14 November 2018 / Approved: 16 November 2018 / Online: 16 November 2018 (05:02:19 CET)

A peer-reviewed article of this Preprint also exists.

Lia, A.; Gallo, A.; Marti, L.; Roversi, P.; Santino, A. EFR-Mediated Innate Immune Response in Arabidopsis thaliana is a Useful Tool for Identification of Novel ERQC Modulators. Genes 2019, 10, 15. Lia, A.; Gallo, A.; Marti, L.; Roversi, P.; Santino, A. EFR-Mediated Innate Immune Response in Arabidopsis thaliana is a Useful Tool for Identification of Novel ERQC Modulators. Genes 2019, 10, 15.

Journal reference: Genes 2019, 10, 15
DOI: 10.3390/genes10010015

Abstract

Plants offer a simpler and cheaper alternative to mammalian animal models for the study of Endoplasmic Reticulum glycoprotein folding Quality Control (ERQC). In particular, the Arabidopsis thaliana (At) innate immune response to bacterial peptides provides an easy means of assaying ERQC function in vivo. A number of mutants that are useful to study ERQC in planta have been described in the literature, but only for a subset of these mutants the innate immune response to bacterial elicitors has been measured beyond monitoring plant weight and some physio-pathological parameters related to the plant immune response. In order to probe deeper into the role of ERQC in the plant immune response, we monitored expression levels of the PHI-1 and RET-OX genes in the At ER α-Glu II rsw3 and the At UGGT uggt1-1 mutant plants, in response to bacterial peptides elf18 and flg22. The elf18 response was impaired in the rsw3 but not completely abrogated in the uggt1-1 mutant plants, raising the possibility that the latter enzyme is partly dispensable for ERF signalling. In the rsw3 mutant, seedling growth was impaired only by concomitant application of the At ER α-Glu II NB-DNJ inhibitor at concentrations above 500 nM, suggesting residual activity in this mutant. The study highlights the need for extending plant innate immune response studies to assays sampling EFR signalling at the molecular level.

Subject Areas

Arabidopsis thaliana; ER α–glucosidase II; glycoprotein folding quality control; plant immune response; UGGT; elf18; flg22; EFR; FLS2; rsw3; uggt1-1; NB-DNJ

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