Evolution of angiosperms

The EVA team conducts fundamental research in the field of plant evolution, at scales ranging from the population (micro-evolutionary scale) to flowering plants (angiosperms) as a whole (macro-evolutionary scale).

These questions are organized into three axes: (1) Evolutionary drivers of plant adaptation and species diversification; (2) evolution of pollen and flowers; (3) description of flowering plant diversity to improve our knowledge in relation to the taxonomy and systematics of these organisms.

The research conducted by the EVA team involves a wide array of approaches including population genetics, molecular evolution, phylogenetic reconstruction, ancestral state reconstruction, molecular dating, cytogenetics, and floral development.

Laboratoire Ecologie, Systématique et Evolution TEAM LEADER: Olivier Chauveau

Béatrice Albert, Xavier Aubriot, Olivier Chauveau, Françoise Lamy, Sophie Nadot, Véronique Normand, Thierry Robert, Sonja Siljak-Yakovlev, Najat Takvorian

Pauline Delpeuch, Polina Karpunina, Ernesto Testé Lozano


Laboratoire Ecologie, Systématique et Evolution

Research areas:

Evolutionary drivers of plant adaptation and species diversification

Knowledge of the genetic bases and evolutionary drivers of plant adaptation to local environment is a major issue in evolutionary biology and has strong implications in ecosystem conservation and agrobiodiversity valorisation.

Research is conducted on wild species and crops using multi-level (from genes to ecosystems) and interdisciplinary (biology, geography, social sciences) approaches.

This research is structured into four major subprojects: 1) variability in genome organization, local adaptation and species diversification, 2) microevolutionary processes promoting species emergence and diversification 3) Genetic architecture of traits involved in adaptation to contrasted environments, and 4) Crop seed exchanges as a driver of population adaptation to global change.

Evolution of pollen and flowers

Pollen grains in angiosperms are morphologically highly diverse. Our character of interest is the aperture type, which is defined by the number, shape and position of apertures. Apertures are defined as zones where the pollen wall is thinner or even absent, and have the double function of allowing pollen tube germination (which in turn allows fertilization of the female parts), and exchanges between the pollen grain and the environment. We explore the developmental and selective processes leading to variation in aperture types. We are also interested in the phylogenetic distribution of this diversity.

The flower is a key innovation of the most diversified group of land plants, the angiosperms. Beyond a highly conserved basic groundplan, they present an amazing diversity that is believed to have been largely shaped by the interaction with pollinating agents. Using a variety of approaches combining ancestral state reconstruction, diversification rate analyses, developmental floral biology and evo-devo studies, we aim to unravel (i) the diversification patterns having led to the observed diversity of flowering plants, (ii) the patterns of floral trait evolution, and (iii) the developmental and genetic bases of floral trait diversity.

Taxonomy and plant systematics