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ABA Metabolism and Homeostasis in Seed Dormancy and Germination

A New Role for Plastid Thioredoxins in Seed Physiology in Relation to Hormone Regulation

CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Université Evry, Université Paris-Saclay, F-91405 Orsay, France
CNRS, Laboratoire de Biologie du Développement, Sorbonne Université, F-75005 Paris, France
IRHS-UMR1345, INRAE, Institut Agro, SFR 4207 QuaSaV, Université d’Angers, F-49071 Beaucouzé, France
Authors to whom correspondence should be addressed.
Current address: Institute of Plant Biology and Biotechnology, University of Münster, Schlossplatz 7, F-48149 Münster, Germany.
Current address: CNRS, INRAE, IRD, IEES-Paris, Université Paris Est Creteil, F-94010 Creteil, France.
Academic Editor: Lam-Son Phan Tran
Int. J. Mol. Sci. 2021, 22(19), 10395;
Received: 27 August 2021 / Revised: 19 September 2021 / Accepted: 22 September 2021 / Published: 27 September 2021
In Arabidopsis seeds, ROS have been shown to be enabling actors of cellular signaling pathways promoting germination, but their accumulation under stress conditions or during aging leads to a decrease in the ability to germinate. Previous biochemical work revealed that a specific class of plastid thioredoxins (Trxs), the y-type Trxs, can fulfill antioxidant functions. Among the ten plastidial Trx isoforms identified in Arabidopsis, Trx y1 mRNA is the most abundant in dry seeds. We hypothesized that Trx y1 and Trx y2 would play an important role in seed physiology as antioxidants. Using reverse genetics, we found important changes in the corresponding Arabidopsis mutant seeds. They display remarkable traits such as increased longevity and higher and faster germination in conditions of reduced water availability or oxidative stress. These phenotypes suggest that Trxs y do not play an antioxidant role in seeds, as further evidenced by no changes in global ROS contents and protein redox status found in the corresponding mutant seeds. Instead, we provide evidence that marker genes of ABA and GAs pathways are perturbed in mutant seeds, together with their sensitivity to specific hormone inhibitors. Altogether, our results suggest that Trxs y function in Arabidopsis seeds is not linked to their previously identified antioxidant roles and reveal a new role for plastid Trxs linked to hormone regulation. View Full-Text
Keywords: redox; non-photosynthetic organ redox; non-photosynthetic organ
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MDPI and ACS Style

Née, G.; Châtel-Innocenti, G.; Meimoun, P.; Leymarie, J.; Montrichard, F.; Satour, P.; Bailly, C.; Issakidis-Bourguet, E. A New Role for Plastid Thioredoxins in Seed Physiology in Relation to Hormone Regulation. Int. J. Mol. Sci. 2021, 22, 10395.

AMA Style

Née G, Châtel-Innocenti G, Meimoun P, Leymarie J, Montrichard F, Satour P, Bailly C, Issakidis-Bourguet E. A New Role for Plastid Thioredoxins in Seed Physiology in Relation to Hormone Regulation. International Journal of Molecular Sciences. 2021; 22(19):10395.

Chicago/Turabian Style

Née, Guillaume, Gilles Châtel-Innocenti, Patrice Meimoun, Juliette Leymarie, Françoise Montrichard, Pascale Satour, Christophe Bailly, and Emmanuelle Issakidis-Bourguet. 2021. "A New Role for Plastid Thioredoxins in Seed Physiology in Relation to Hormone Regulation" International Journal of Molecular Sciences 22, no. 19: 10395.

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