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Open AccessArticle

Effects of Jasmonic Acid in ER Stress and Unfolded Protein Response in Tomato Plants

1
Department of Plant Biology, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
2
Doctoral School of Biology, University of Szeged, Közép fasor 52, H-6726 Szeged, Hungary
*
Author to whom correspondence should be addressed.
Biomolecules 2020, 10(7), 1031; https://doi.org/10.3390/biom10071031
Received: 22 May 2020 / Revised: 1 July 2020 / Accepted: 8 July 2020 / Published: 10 July 2020
(This article belongs to the Special Issue Phytohormones 2020)
Endoplasmic reticulum (ER) stress elicits a protective mechanism called unfolded protein response (UPR) to maintain cellular homeostasis, which can be regulated by defence hormones. In this study, the physiological role of jasmonic acid (JA) in ER stress and UPR signalling has been investigated in intact leaves of tomato plants. Exogenous JA treatments not only induced the transcript accumulation of UPR marker gene SlBiP but also elevated transcript levels of SlIRE1 and SlbZIP60. By the application of JA signalling mutant jai1 plants, the role of JA in ER stress sensing and signalling was further investigated. Treatment with tunicamycin (Tm), the inhibitor of N-glycosylation of secreted glycoproteins, increased the transcript levels of SlBiP. Interestingly, SlIRE1a and SlIRE1b were significantly lower in jai1. In contrast, the transcript accumulation of Bax Inhibitor-1 (SlBI1) and SlbZIP60 was higher in jai1. To evaluate how a chemical chaperone modulates Tm-induced ER stress, plants were treated with sodium 4-phenylbutyrate, which also decreased the Tm-induced increase in SlBiP, SlIRE1a, and SlBI1 transcripts. In addition, it was found that changes in hydrogen peroxide content, proteasomal activity, and lipid peroxidation induced by Tm is regulated by JA, while nitric oxide was not involved in ER stress and UPR signalling in leaves of tomato. View Full-Text
Keywords: ER stress; jasmonic acid; nitric oxide; protein carbonylation; reactive oxygen species; unfolded protein response ER stress; jasmonic acid; nitric oxide; protein carbonylation; reactive oxygen species; unfolded protein response
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Czékus, Z.; Csíkos, O.; Ördög, A.; Tari, I.; Poór, P. Effects of Jasmonic Acid in ER Stress and Unfolded Protein Response in Tomato Plants. Biomolecules 2020, 10, 1031.

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