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

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...

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Published in:International journal of molecular sciences 2021-01, Vol.22 (3), p.1063
Main Authors: Sánchez-Guerrero, Antonio, Nadal, Miquel, Florez-Sarasa, Igor, Ribas-Carbó, Miquel, Vallarino, José G, De Brasi-Velasco, Sabrina, Fernie, Alisdair R, Flexas, Jaume, Jiménez, Ana, Sevilla, Francisca
Format: Article
Language:English
Subjects:
antioxidants
oxidative stress
photosynthesis
salinity
stomata
thioredoxin o1
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Summary: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 TRX 1 to the photosynthetic response under salinity analyzing Arabidopsis wild-type (WT) and two 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 mutant lines was altered, with higher levels of H O 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 TRX 1-altered plants. Therefore, the lack of affected stomata development and opening and the mutants modulate their antioxidant, metabolic and hormonal responses to optimize their adaptation to salinity.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms22031063