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Les coulisses de la floraison

alt15e colloque scientifique de la SNHF
Rennes, le 24 mai 2013

Tel fleurit aujourd'hui qui demain flétrira, tel flétrit aujourd'hui qui demain fleurira.
Pierre de Ronsard


Peintres, poètes, sculpteurs, musiciens, chanteurs, architectes, les artistes de tout temps ont chanté la magie des fleurs, de la floraison, des saisons. Plus prosaïquement mais toujours avec enthousiasme, botanistes et physiologistes ont décrit puis expliqué la floraison des plantes supérieures. Lorsque Carl von Linné établit sa classification végétale, il se basa sur l'anatomie florale et fit appel à la sexualité. On ne connaissait pas la signification évolutive de la floraison végétale. On en ignorait tout autant ses mécanismes d'apparition. La fécondation était pressentie, mais non observée. La fleur n'avait pas encore avoué toutes ses complicités avec le monde messager des insectes ni ses nombreuses stratégies pour assurer coûte que coûte une descendance.

À quelques exceptions près, chaque espèce de plante a, pour fleurir, sa saison préférée. Les primevères s'épanouissent en février, forsythia et lilas arrivent en force au printemps, les pavots marquent le début de l'été, les colchiques apparaissent avec l'automne lorsque pommes et poires murissent...

Adaptées à leur environnement et accompagnant les saisons, comment les plantes à fleurs captent-elles les signaux qui distinguent les périodes de l'année ? Comment les fleurs se développent-elles ? Comment se forment les fruits et les graines ?

La SNHF se propose d'explorer les différentes facettes de cet aspect fondamental de la vie des plantes lors de ce colloque.

Programme* de la journée

8h45 > Accueil : Grégoire Thomas (directeur général Agrocampus Ouest)
Ouverture : Henri Delbard (président de la SNHF) et Yvette Dattée (présidente du conseil scientifique)
9h15 > Conférence introductive : La fleur : un système biologique unique. Christian Dumas (professeur émérite à l'Ecole Normale Supérieure de Lyon, Membre de l'Académie des sciences)

10h00 > EMERGENCE DE LA FLEUR
La floraison, une simple histoire de coïncidence ? Jean-Pierre Bouly (maître de conférences, Université Pierre et Marie Curie)
Les architectes de la fleur : variations sur un thème imposé. Marianne Delarue (maître de conférences, Institut de biologie des plantes, Université Paris-Sud)
10h50 > Pause, posters

11h15 > LES RENDEZ VOUS AVEC LA FLORAISON
Mais pourquoi donc mon arbre fruitier ne revient-il pas à fleur chaque année ? Jean-Jacques Kelner (maître de conférences, Amélioration Génétique et Adaptation des plantes, (UMR AGAP 1334), Montpellier SupAgro)
Gestion de la floraison chez les arbustes d'ornement. Gilles Galopin (maître de conférences, Institut de Recherche en Horticulture et Semences (UMR INRA 1345), Agrocampus Ouest)
Mignonne, allons voir... pourquoi la rose refleurit ? Fabrice Foucher (chargé de recherche, Institut de recherche en Horticulture et semences (UMR INRA 1345), INRA Angers)
12h30 > Repas
14h00 > Exposé du lauréat du prix de thèse

14h30 > EN ATTENDANT LE FRUIT
De la fleur à la graine, une aventure. Aline Raynal-Roques (professeur, Muséum National d'Histoire Naturelle)
Incompatibilité sexuelle : Comment la femelle choisit son mâle ? Thierry Gaude (professeur Reproduction et développement des plantes (UMR 5667) Ecole Normale Supérieure Lyon)
Aspermie ou quand la graine n'est plus indispensable ou plus désirable ! Patrice This (directeur de recherche, INRA, - Amélioration Génétique et Adaptation des plantes (UMR AGAP 1334) Montpellier)
15h45 > Discussion générale et présentation du prix de projet
16h30 > Conclusion. Christian Dumas
17h00 > Fin du colloque

*Susceptible de modifications

RENSEIGNEMENTS PRATIQUES
Lieu : Agrocampus ouest - centre Rennes - 65, rue de Saint-Brieuc - 35042 Rennes

Tarif : 60 € et 48 € pour les adhérents
Tarifs pour participants conventionnés (convention et attestation de présence dans le cadre d'une formation continue (OPCA)) : 120 € et 100 € pour les adhérents
Tarif sans le buffet : 30 € et 24 € pour les adhérents.

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