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Antioxidant Metabolic Pathways in Plants 2.0

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 (20 August 2021) | Viewed by 5944

Special Issue Editors

Department of Stress Biology and Plant Pathology, Centro de Edafología y Biología Aplicada del Segura (CSIC), Murcia, Spain
Interests: plant antioxidants; organellar antioxidants; abiotic stress; biotic stress; metabolic pathways; new antioxidants; protection; reactive oxygen
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Guest Editor
Department of Stress Biology and Plant Pathology, Centro de Edafología y Biología Aplicada del Segura (CSIC), Murcia, Spain
Interests: circadian rhythms; redox biology; abiotic stress; calcium signaling; reactive oxygen species; reactive nitrogen species
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Reactive oxygen species (ROS) derived from oxygen reduction are key players in the signaling pathways ocurring during plant responses to biotic and abiotic stresses. The associated oxidative processes are mainly controlled by the antioxidant and redox system, and knowledge of the response of their metabolic pathways is crucial for plants in order to cope with growing environmental constraints. Thus, the regulation and coordination of antioxidant systems is of special importance for our understanding of plant stress responses.

The purpose of this Special Issue of the International Journal of Molecular Science is to provide a current overview of the research on antioxidant metabolic pathways in plants through the contribution of experts in the field of plant antioxidants. For this, you are invited to submit original articles, reviews, and perspectives focused on this topic, such as the chemistry of plant antioxidants, antioxidant mechanisms, improving plant antioxidants and derived products, antioxidant metabolic pathways involved in stress responses, the relationship between antioxidants and other protective systems, and other related topics. This will allow us to have an overview of the importance of these key protective mechanisms for the plant metabolism, with both basic and applied research.

Dr. Ana Jiménez
Dr. María Carmen Martí Ruiz
Guest Editors

Manuscript Submission Information

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Published Papers (2 papers)

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17 pages, 2967 KiB  
Article
Insights of Phenolic Pathway in Fruits: Transcriptional and Metabolic Profiling in Apricot (Prunus armeniaca)
by Helena Gómez-Martínez, Francisco Gil-Muñoz, Almudena Bermejo, Elena Zuriaga and Maria L. Badenes
Int. J. Mol. Sci. 2021, 22(7), 3411; https://doi.org/10.3390/ijms22073411 - 26 Mar 2021
Cited by 9 | Viewed by 2099
Abstract
There is an increasing interest in polyphenols, plant secondary metabolites, in terms of fruit quality and diet, mainly due to their antioxidant effect. However, the identification of key gene enzymes and their roles in the phenylpropanoid pathway in temperate fruits species remains uncertain. [...] Read more.
There is an increasing interest in polyphenols, plant secondary metabolites, in terms of fruit quality and diet, mainly due to their antioxidant effect. However, the identification of key gene enzymes and their roles in the phenylpropanoid pathway in temperate fruits species remains uncertain. Apricot (Prunus armeniaca) is a Mediterranean fruit with high diversity and fruit quality properties, being an excellent source of polyphenol compounds. For a better understanding of the phenolic pathway in these fruits, we selected a set of accessions with genetic-based differences in phenolic compounds accumulation. HPLC analysis of the main phenolic compounds and transcriptional analysis of the genes involved in key steps of the polyphenol network were carried out. Phenylalanine ammonia-lyase (PAL), dihydroflavonol-4-reductase (DFR) and flavonol synthase (FLS) were the key enzymes selected. Orthologous of the genes involved in transcription of these enzymes were identified in apricot: ParPAL1, ParPAL2, ParDFR, ParFLS1 and ParFLS2. Transcriptional data of the genes involved in those critical points and their relationships with the polyphenol compounds were analyzed. Higher expression of ParDFR and ParPAL2 has been associated with red-blushed accessions. Differences in expression between paralogues could be related to the presence of a BOXCOREDCPAL cis-acting element related to the genes involved in anthocyanin synthesis ParFLS2, ParDFR and ParPAL2. Full article
(This article belongs to the Special Issue Antioxidant Metabolic Pathways in Plants 2.0)
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22 pages, 5461 KiB  
Article
Decreased Levels of Thioredoxin o1 Influences Stomatal Development and Aperture but Not Photosynthesis under Non-Stress and Saline Conditions
by Antonio Sánchez-Guerrero, Miquel Nadal, Igor Florez-Sarasa, Miquel Ribas-Carbó, José G. Vallarino, Sabrina De Brasi-Velasco, Alisdair R. Fernie, Jaume Flexas, Ana Jiménez and Francisca Sevilla
Int. J. Mol. Sci. 2021, 22(3), 1063; https://doi.org/10.3390/ijms22031063 - 21 Jan 2021
Cited by 8 | Viewed by 2910
Abstract
Salinity has a negative impact on plant growth, with photosynthesis being downregulated partially due to osmotic effect and enhanced cellular oxidation. Redox signaling contributes to the plant response playing thioredoxins (TRXs) a central role. In this work we explore the potential contribution of [...] Read more.
Salinity has a negative impact on plant growth, with photosynthesis being downregulated partially due to osmotic effect and enhanced cellular oxidation. Redox signaling contributes to the plant response playing thioredoxins (TRXs) a central role. In this work we explore the potential contribution of Arabidopsis TRXo1 to the photosynthetic response under salinity analyzing Arabidopsis wild-type (WT) and two Attrxo1 mutant lines in their growth under short photoperiod and higher light intensity than previous reported works. Stomatal development and apertures and the antioxidant, hormonal and metabolic acclimation are also analyzed. In control conditions mutant plants displayed less and larger developed stomata and higher pore size which could underlie their higher stomatal conductance, without being affected in other photosynthetic parameters. Under salinity, all genotypes displayed a general decrease in photosynthesis and the oxidative status in the Attrxo1 mutant lines was altered, with higher levels of H2O2 and NO but also higher ascorbate/glutathione (ASC/GSH) redox states than WT plants. Finally, sugar changes and increases in abscisic acid (ABA) and NO may be involved in the observed higher stomatal response of the TRXo1-altered plants. Therefore, the lack of AtTRXo1 affected stomata development and opening and the mutants modulate their antioxidant, metabolic and hormonal responses to optimize their adaptation to salinity. Full article
(This article belongs to the Special Issue Antioxidant Metabolic Pathways in Plants 2.0)
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