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Special Issue "Salicylic Acid Signalling in Plants 2022"

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Plant Sciences".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 2119

Special Issue Editor

Department of Plant Physiology and Metabolomics, Agricultural Institute Centre for Agricultural Research, H-4032 Martonvásár, Hungary
Interests: abiotic stress; photosynthesis; plants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Salicylic acid (SA) is ubiquitously distributed in the whole plant kingdom. The basal level of SA differs widely among species. It is generally present either in the free state or in the form of glycosylated, methylated, glucose ester, or amino acid conjugates. In plants, SA can be synthesized via two distinct and compartmentalized enzymatic pathways, both requiring the primary metabolite chorismate. L-phenylalanine, derived from chorismate, can be converted into SA via the precursors free benzoic acid, benzoyl glucose, or ortho-hydroxy-cinnamic acid, depending on the plant species. Chorismate can also be converted into SA via isochorismate. Several physiological processes in which SA may play a role have been reported, including seed germination, growth regulation, flower induction, thermogenesis, and, in particular, the regulation of plant responses under biotic or abiotic stress conditions. SA may be involved in different signaling processes. For example, various hormones involved in plant defense mechanisms cross-talk with SA, and both negative and positive interactions have been reported. SA signaling also leads to the reprogramming of gene expression and protein synthesis. It may affect the antioxidative metabolism, and it modulates cellular redox homeostasis. Although the therapeutic effect of SA in humans has been well-studied for about 200 years, its role in plants has only been recognized in recent decades, and the full picture is still not clear. In spite of the extensive work on SA-related processes, the exact mode of action is poorly understood.

Papers submitted to this Special Issue must report high-novelty results and/or new models on the mode of action of SA in plants. The molecular mechanism(s) of SA-related signaling processes, new results of the synthesis of SA, and the role of other related molecules (precursors, conjugated forms, etc.) are also of interest. Research articles and review papers are also welcome.

Prof. Dr. Tibor Janda
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

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  • acclimation
  • biosynthesis 
  • cross talk 
  • hormones 
  • phenolics 
  • plant growth and development
  • plant stress 
  • salicylic acid signalling

Published Papers (1 paper)

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The TGA Transcription Factors from Clade II Negatively Regulate the Salicylic Acid Accumulation in Arabidopsis
Int. J. Mol. Sci. 2022, 23(19), 11631; https://doi.org/10.3390/ijms231911631 - 01 Oct 2022
Cited by 1 | Viewed by 1729
Salicylic acid (SA) is a hormone that modulates plant defenses by inducing changes in gene expression. The mechanisms that control SA accumulation are essential for understanding the defensive process. TGA transcription factors from clade II in Arabidopsis, which include the proteins TGA2, TGA5, [...] Read more.
Salicylic acid (SA) is a hormone that modulates plant defenses by inducing changes in gene expression. The mechanisms that control SA accumulation are essential for understanding the defensive process. TGA transcription factors from clade II in Arabidopsis, which include the proteins TGA2, TGA5, and TGA6, are known to be key positive mediators for the transcription of genes such as PR-1 that are induced by SA application. However, unexpectedly, stress conditions that induce SA accumulation, such as infection with the avirulent pathogen P. syringae DC3000/AvrRPM1 and UV-C irradiation, result in enhanced PR-1 induction in plants lacking the clade II TGAs (tga256 plants). Increased PR-1 induction was accompanied by enhanced isochorismate synthase-dependent SA production as well as the upregulation of several genes involved in the hormone’s accumulation. In response to avirulent P. syringae, PR-1 was previously shown to be controlled by both SA-dependent and -independent pathways. Therefore, the enhanced induction of PR-1 (and other defense genes) and accumulation of SA in the tga256 mutant plants is consistent with the clade II TGA factors providing negative feedback regulation of the SA-dependent and/or -independent pathways. Together, our results indicate that the TGA transcription factors from clade II negatively control SA accumulation under stress conditions that induce the hormone production. Our study describes a mechanism involving old actors playing new roles in regulating SA homeostasis under stress. Full article
(This article belongs to the Special Issue Salicylic Acid Signalling in Plants 2022)
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