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EFR-Mediated Innate Immune Response in Arabidopsis thaliana is a Useful Tool for Identification of Novel ERQC Modulators

1
Institute of Sciences of Food Production, C.N.R. Unit of Lecce, via Monteroni, I-73100 Lecce, Italy
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Department of Biology and Biotechnology “C. Darwin”, Sapienza University of Rome, 00185 Rome, Italy
3
Leicester Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Henry Wellcome Building, Lancaster Road, Leicester LE1 7RH, UK
*
Authors to whom correspondence should be addressed.
Genes 2019, 10(1), 15; https://doi.org/10.3390/genes10010015
Received: 14 November 2018 / Revised: 19 December 2018 / Accepted: 19 December 2018 / Published: 27 December 2018
(This article belongs to the Section Plant Genetics and Genomics)
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 Phosphate-induced 1 (PHI-1) and reticulin-oxidase homologue (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 EF-Tu receptor (EFR) signaling. 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, compatibly with residual activity in this mutant. The study highlights the need for extending plant innate immune response studies to assays sampling EFR signaling at the molecular level. View Full-Text
Keywords: Arabidopsis thaliana; ER α–glucosidase II; glycoprotein folding quality control; UGGT; elf18; flg22; EFR; rsw3; uggt1-1; NB-DNJ. Arabidopsis thaliana; ER α–glucosidase II; glycoprotein folding quality control; UGGT; elf18; flg22; EFR; rsw3; uggt1-1; NB-DNJ.
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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.

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