Evolution de la dioécie et adaptation au froid chez les Moraceae

par Qian Zhang

Projet de thèse en Biologie

Sous la direction de Hervé Sauquet.

Thèses en préparation à Paris Saclay , dans le cadre de Sciences du Végétal : du gène à l'écosystème , en partenariat avec ESE Écologie, Systématique et Évolution (laboratoire) , Evolution des Angiospermes (equipe de recherche) et de Université Paris-Sud (établissement de préparation de la thèse) depuis le 29-09-2015 .

  • Titre traduit

    Living through the cold winter: the evolution of dioecy in Moraceae


  • Résumé

    Flowers are the reproductive organs of angiosperms. There are four breeding systems in family Moraceae (monecy, dioecy, gynodioecy, and androdioecy), which includes 39 genera and ca. 1125 species. Among them, the fig genus, Ficus (ca. 750 spp.), is well known for its coevolution with its wasp pollinators. Two breeding systems were observed in Ficus, monoecy and gynodioecy. Monoecy has been suggested to be ancestral in the former studies. In this project, I will investigate breeding system evolution in Ficus and Moraceae and its relationship with climate to answer a number of key questions: How did breeding systems evolve in Ficus and Moraceae? Did breeding system evolution influence diversification rates in the group? To answer these questions, new species-level dated phylogenetic trees of Ficus and Moraceae will be reconstructed using available sequence data. Ancestral state reconstruction of breeding systems and diversification rate shifts in Ficus and Moraceae will be inferred with state-of-the-art methods.