How Do the Simplest Multicellular Algae Stir towards Light ?

Orateur : Hélène DE MALEPRADE (Department of Applied Mathematics and Theoretical Physics, University of Cambridge)

Microscopic green algae are commonly found in mud, puddles or lakes, and show great diversity in structural complexity. One encounters the unicellular Chlamydomonas, exhibiting two flagella whose beating enables it to swim in a breast stroke towards light, a nowadays widely studied behaviour favouring photosynthesis. One also finds Gonium, an algae made of 16 Chlamydomonas-like cells arranged in two concentric squares, with all flagella on one side of the plate. It already shows cell differentiation, and is one of the first multicellular algae : Gonium is a key organism to understand the evolution towards multicellularity.

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