Special Issue "Role of Melatonin in Plants"

A special issue of Biomolecules (ISSN 2218-273X). This special issue belongs to the section "Natural and Bio-inspired Molecules".

Deadline for manuscript submissions: 31 August 2022 | Viewed by 496

Special Issue Editors

Prof. Dr. Kyoungwhan Back
E-Mail Website
Guest Editor
Department of Biotechnology, College of Agricultural and Life Sciences, Chonnam National University, Gwangju 61186, Korea
Interests: plant melatonin biosynthesis; transgenic plants; serotonin N-acetyltransferase; herbicide resistance
Dr. Ok-Jin Hwang
E-Mail Website
Guest Editor
Department of Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea
Interests: plant tissue culture; brassinosteroids; transgenic rice; abiotic stress
Dr. Hyoung-Yool Lee
E-Mail Website
Guest Editor
Department of Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea
Interests: pathogen defense; starch synthesis; Arabidopsis thaliana; biotic stress

Special Issue Information

Dear Colleagues,

In plants, melatonin biosynthesis begins with tryptophan, an aromatic amino acid synthesized in chloroplasts via the shikimate pathway. Due to its amphiphilic molecule, it is omnipresent in all subcellular compartments functioning as an antioxidant as well as an important signaling molecule for optimal functions of chloroplasts and endoplasmic reticulum, and so forth. As opposed to many previous reports, it is also revealed that melatonin levels are very low, as indicated by the lower catalytic activity of melatonin biosynthesis enzymes. Furthermore, the biosynthetic pathway of melatonin is complex and requires more studies. In addition, melatonin is rapidly metabolized into a series of melatonin metabolites including 2-hydroxymelatonin and cyclic 3-hydroxymelatonin, but their relative levels are expected to be variable in plants depending on the expression levels of their corresponding enzymes. The steady state levels of melatonin are precisely regulated by a large number of isogenes and gene family of respective genes responsible for melatonin biosynthesis and catabolism in plants. This Special issue invites all aspects of melatonin studies which are associated with melatonin synthesis, catabolism, their related genes, quantification of melatonin and its metabolites, possible signaling pathway components, and functions of melatonin, as well as its metabolites in plants.

Prof. Dr. Kyoungwhan Back
Dr. Ok-Jin Hwang
Dr. Hyoung-Yool Lee
Guest Editors

Manuscript Submission Information

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Keywords

  • melatonin
  • plant growth and development
  • defense response
  • melatonin metabolites

Published Papers (1 paper)

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Research

Article
Mammalian Melatonin Agonist Pharmaceuticals Stimulate Rhomboid Proteins in Plants
Biomolecules 2022, 12(7), 882; https://doi.org/10.3390/biom12070882 (registering DOI) - 24 Jun 2022
Abstract
Melatonin is a human neurotransmitter and plant signalling metabolite that perceives and directs plant metabolism. The mechanisms of melatonin action in plants remain undefined. We hypothesized that roots have a melatonin-specific receptor and/or transporter that can respond to melatonin-mediating pharmaceuticals. To test this [...] Read more.
Melatonin is a human neurotransmitter and plant signalling metabolite that perceives and directs plant metabolism. The mechanisms of melatonin action in plants remain undefined. We hypothesized that roots have a melatonin-specific receptor and/or transporter that can respond to melatonin-mediating pharmaceuticals. To test this hypothesis Arabidopsis seedlings were grown with melatonin pharmaceutical receptor agonists: ramelteon and tasimelteon, and/or antagonists: luzindole and 4-P-PDOT. Ramelteon was found both to mimic and competitively inhibit melatonin metabolism in plants. Due to the higher selectivity of ramelteon for the MT1 receptor type in humans, a sequence homology search for MT1 in Arabidopsis identified the rhomboid-like protein 7 (RBL7). In physiological studies, Arabidopsis rbl7 mutants were less responsive to ramelteon and melatonin. Quantum dot visualizations of the effects of ramelteon on melatonin binding to root cell membranes revealed a potential mechanism. We propose that RBL7 is a melatonin-interacting protein that directs root architecture and growth in a mechanism that is responsive to environmental factors. Full article
(This article belongs to the Special Issue Role of Melatonin in Plants)
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