98 research outputs found
Antioxidant Systems are Regulated by Nitric Oxide-Mediated Post-translational Modifications (NO-PTMs)
Nitric oxide (NO) is a biological messenger that orchestrates a plethora of plant functions, mainly through post-translational modifications (PTMs) such as S-nitrosylation or tyrosine nitration. In plants, hundreds of proteins have been identified as potential targets of these NO-PTMs under physiological and stress conditions indicating the relevance of NO in plant-signaling mechanisms. Among these NO protein targets, there are different antioxidant enzymes involved in the control of reactive oxygen species (ROS), such as H2O2, which is also a signal molecule. This highlights the close relationship between ROS/NO signaling pathways. The major plant antioxidant enzymes, including catalase, superoxide dismutases (SODs) peroxiredoxins (Prx) and all the enzymatic components of the ascorbate-glutathione (Asa-GSH) cycle, have been shown to be modulated to different degrees by NO-PTMs. This mini-review will update the recent knowledge concerning the interaction of NO with these antioxidant enzymes, with a special focus on the components of the Asa-GSH cycle and their physiological relevance.JB-M would like to thank the Ministry of Science and Innovation for funding the Ph.D. fellowship (F.P.U.). This study was supported by an ERDF grant co-financed by the Ministry of Economy and Competitiveness (project BIO2012-33904), Junta de AndalucĂa (P10-AGR-6038 and groups BIO286 and BIO192) and RECUPERA2020 in Spain.Peer reviewedPeer Reviewe
Nitric Oxide Controls Constitutive Freezing Tolerance in Arabidopsis by Attenuating the Levels of Osmoprotectants, Stress-Related Hormones and Anthocyanins
[EN] Plant tolerance to freezing temperatures is governed by endogenous constitutive components and environmental inducing factors. Nitric oxide (NO) is one of the endogenous components that participate in freezing tolerance regulation. A combined metabolomic and transcriptomic characterization of NO-deficient nia1,2noa1Âż2 mutant plants suggests that NO acts attenuating the production and accumulation of osmoprotective and regulatory metabolites, such as sugars and polyamines, stress-related hormones, such as ABA and jasmonates, and antioxidants, such as anthocyanins and flavonoids. Accordingly, NO-deficient plants are constitutively more freezing tolerant than wild type plants.This work was supported by grants BIO2011-27526 and BIO2014-56067-P from the Spanish Ministry of Economy and Competitiveness and FEDER funds. 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Charles Sinsout (1889-1985), un notable radical ?
Le souvenir de « Monsieur le prĂ©sident Sinsout » demeure bien vivace en Bergeracois. Il fut un Ă©lu radical a priori classique avec plusieurs mandats, plusieurs fonctions exĂ©cutives dans la formation valoisienne, une belle longĂ©vitĂ© politique, de 1925 Ă 1971 sur trois RĂ©publiques. En symbiose avec les agriculteurs, il a collectionnĂ© Ă leurs cĂŽtĂ©s les dĂ©fis, des dĂ©fis qui mĂ©ritent ce premier dĂ©cryptage. IntĂ©ressant sera aussi de situer dans « la mouvance radicale » cet Ă©lu plus atypique quâil n..
Un contre-exemple : la rĂ©sistance au dĂ©clin dâun fief radical, Georges et Alain Bonnet en Dordogne. Territoire et liens croisĂ©s de dĂ©pendance
Le fief de Georges Bonnet en Dordogne offre un bel exemple de rĂ©sistance au dĂ©clin du radicalisme, avec, Ă la base, le tour de force de lâancien ministre qui, proscrit, reconquiert le cĆur de son territoire dâinfluence puis retrouve une circonscription sous la IVe RĂ©publique. Quâest-ce qui fait la spĂ©cificitĂ© de ce fief de G. Bonnet â ancien dĂ©putĂ© et ministre radical sous la IIIe RĂ©publique â Ă Champagnac-de-BĂ©lair, BrantĂŽme et dans la circonscription de Nontron (Dordogne) lors de sa reconqu..
Les réponses de l'Aquitaine politique (1956-1967)
L'Aquitaine est une vieille terre radicale et modérée, trÚs marquée par la tradition parlementaire héritée de la TroisiÚme République. Quelles réponses a-t-elle apporté à la nouvelle donne introduite par le général de Gaulle en 1958 et surtout en 1962 ? Ses cultures politiques ont-elles été modifiées en profondeur pendant cette décennie 1956-1967 ? En un mot, y a-t-il eu vraiment modernisation de la vie politique ? Ici, je prendrai comme cadre, la région administrative avec ses cinq départeme..
Odette Pelletan-Bonnet (1893-1961), une Ă©pouse dans lâombre de lâhomme politique ?
ĂgĂ©rie de la IIIe RĂ©publique dans les annĂ©es 1930, Odette Pelletan (1893-1961), fille dâAndrĂ© Pelletan et de ThĂ©rĂšse Ordinaire, est quasiment oubliĂ©e, frappĂ©e du discrĂ©dit qui a affectĂ© son conjoint, Georges Bonnet (1889-1973), assimilĂ© Ă lâultrapacifisme. Les archives privĂ©es de la famille Bonnet, en particulier son journal intime, donnent un singulier relief Ă cette femme engagĂ©e autour de la dĂ©fense de la politique de son mari lors de ses hautes fonctions, tant en France quâĂ lâĂ©tranger. PĂ©trie du rĂ©publicanisme militant hĂ©ritĂ© de la maison Pelletan, attachĂ©e au parlementarisme, elle porte un regard sans concessions sur les coulisses de la scĂšne politicienne. Odette Bonnet nous a laissĂ© des portraits de ses contemporains oĂč ses dons dâobservation font merveille. Avec son franc-parler, ses jugements acerbes, elle occupait une place Ă part parmi lâĂ©lite au pouvoir. Sa libertĂ© de ton lui valut des dĂ©convenues, mais elle sut seconder Georges Bonnet avec panache, jouant sur les cordes mĂ©diatiques, aussi bien Ă Washington, en 1937, pour une ambassade haute en couleurs, quâau Quai dâOrsay, oĂč elle acquiert ses galons de grande dame en 1938. Cette famille se soude davantage durant lâOccupation et lâexil en Suisse (1944-1950). Toute Ă la reconquĂȘte des positions perdues, sous la IVe RĂ©publique, Odette Bonnet est le pilier familial et partage globalement les opinions de Georges Bonnet.Puyaubert Jacques. Odette Pelletan-Bonnet (1893-1961), une Ă©pouse dans lâombre de lâhomme politique ?. In: Les oubliĂ©s de lâhistoire. Actes du 134e CongrĂšs national des sociĂ©tĂ©s historiques et scientifiques, « CĂ©lĂšbres ou obscurs : hommes et femmes dans leurs territoires et leur histoire », Bordeaux, 2009. Paris : Editions du CTHS, 2012. pp. 81-91. (Actes des congrĂšs nationaux des sociĂ©tĂ©s historiques et scientifiques, 134-8
Chapitre VII. Le drame dâun pacifiste (mars-septembre 1939)
Les six mois qui sâouvrent sont ceux qui ont le plus comptĂ© dans la vie de Georges Bonnet, Ă tel point, quâinconsciemment, il sâefforcera de les gommer en focalisant, aprĂšs la guerre, sur la seule confĂ©rence de Munich. Six mois Ă lutter contre des forces belliqueuses contraires. Cette croisade prend bientĂŽt les contours dâun drame permanent pour celui qui voit ses efforts sans cesse ruinĂ©s ou ses succĂšs rĂ©guliĂšrement contestĂ©s. En quelques semaines, le patient Ă©chafaudage construit par le min..
Le centrisme chez les radicaux de lâentre-deux-guerres
DĂšs 1919, le radicalisme paraĂźt attirĂ© Ă la fois par lâOrdre Ă©tabli et par le Mouvement chers Ă François Goguel. Il a, ainsi, la possibilitĂ© de transcender le clivage droite/gauche pour promouvoir un projet consensuel. Champions de la dĂ©mocratie parlementaire, les radicaux vont chercher Ă sâidentifier, comme avant-guerre, Ă la RĂ©publique. Notons que, suivant Serge Berstein, nous considĂ©rerons comme radicaux ceux qui se reconnaissent expressĂ©ment dans le Parti RĂ©publicain radical et radical-so..
Chapitre II. LâĂ©preuve du pouvoir (1924-1932)
Une fois Ă©lu, Georges Bonnet est contraint, dans un premier temps, dâabandonner ses fonctions dâauditeur de premiĂšre classe au Conseil dâĂtat pour entrer au Parlement, le 11 mai 1924 ; il accĂšde trĂšs vite aux fonctions exĂ©cutives, ascension dâautant plus rapide quâil se prĂ©sente comme le bras droit de lâhomme qui lui a fait confiance, Paul PainlevĂ©. Dans sa Lettre Ă un bourgeois de 1914, le jeune homme se proposait dâĂ©liminer les « vieilles barbes », câest chose faite. Le parcours politique d..
Georges Bonnet (1889-1973), un bel exemple de longévité radicale en Dordogne
Puyaubert Jacques. Georges Bonnet (1889-1973), un bel exemple de longévité radicale en Dordogne. In: Le Midi dans la nation française. Actes du 126e CongrÚs national des sociétés historiques et scientifiques, « Terres et hommes du Sud », Toulouse, 2001. Paris : Editions du CTHS, 2002. pp. 121-139. (Actes du CongrÚs national des sociétés savantes, 126
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