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Open AccessArticle

Decreased Levels of Thioredoxin o1 Influences Stomatal Development and Aperture but Not Photosynthesis under Non-Stress and Saline Conditions

1
Department of Stress Biology and Plant Pathology, CEBAS-CSIC, 30100 Murcia, Spain
2
Grup de Recerca en Biologia de les Plantes en Condicions Mediterranies, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain
3
Center for Research in Agricultural Genomics (CRAG)- CSIC-IRTA-UAB-UB, Campus University of Barcelona, 08193 Barcelona, Spain
4
Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Sergey Shabala
Int. J. Mol. Sci. 2021, 22(3), 1063; https://doi.org/10.3390/ijms22031063
Received: 20 November 2020 / Revised: 14 January 2021 / Accepted: 19 January 2021 / Published: 21 January 2021
(This article belongs to the Special Issue Antioxidant Metabolic Pathways in Plants 2.0)
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. View Full-Text
Keywords: antioxidants; oxidative stress; photosynthesis; salinity; stomata; thioredoxin o1 antioxidants; oxidative stress; photosynthesis; salinity; stomata; thioredoxin o1
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MDPI and ACS Style

Sánchez-Guerrero, A.; Nadal, M.; Florez-Sarasa, I.; Ribas-Carbó, M.; Vallarino, J.G.; Brasi-Velasco, S.D.; Fernie, A.R.; Flexas, J.; Jiménez, A.; Sevilla, F. Decreased Levels of Thioredoxin o1 Influences Stomatal Development and Aperture but Not Photosynthesis under Non-Stress and Saline Conditions. Int. J. Mol. Sci. 2021, 22, 1063. https://doi.org/10.3390/ijms22031063

AMA Style

Sánchez-Guerrero A, Nadal M, Florez-Sarasa I, Ribas-Carbó M, Vallarino JG, Brasi-Velasco SD, Fernie AR, Flexas J, Jiménez A, Sevilla F. Decreased Levels of Thioredoxin o1 Influences Stomatal Development and Aperture but Not Photosynthesis under Non-Stress and Saline Conditions. International Journal of Molecular Sciences. 2021; 22(3):1063. https://doi.org/10.3390/ijms22031063

Chicago/Turabian Style

Sánchez-Guerrero, Antonio; Nadal, Miquel; Florez-Sarasa, Igor; Ribas-Carbó, Miquel; Vallarino, José G.; Brasi-Velasco, Sabrina D.; Fernie, Alisdair R.; Flexas, Jaume; Jiménez, Ana; Sevilla, Francisca. 2021. "Decreased Levels of Thioredoxin o1 Influences Stomatal Development and Aperture but Not Photosynthesis under Non-Stress and Saline Conditions" Int. J. Mol. Sci. 22, no. 3: 1063. https://doi.org/10.3390/ijms22031063

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