University of Cambridge > > Morphogenesis Seminar Series > Submerged by 4-way junctions: how the early embryo of the brown alga Saccharina e-copes

Submerged by 4-way junctions: how the early embryo of the brown alga Saccharina e-copes

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  • UserBénédicte Charrier World_link
  • ClockMonday 31 October 2022, 14:30-15:30
  • HouseOnline.

If you have a question about this talk, please contact Elena Scarpa.

Saccharina is a brown marine alga (kelp) that develops a pear-shaped monolayered cell sheet during embryogenesis. Notably, this shape is maintained throughout embryogenesis and, within the sheet, the cells are cuboids arranged in a grid, resulting in the so-called 4-way junctions pattern. Interestingly, this tissue pattern has been described as rare and unstable in land plants (Thompson, 1942; Lloyd, 1991) whereas it is commonly observed in kelp embryos  (Sauvageau, 1918).

Using a 2D-vertex mechanical model, we have studied the cellular parameters that underlie the formation of this grid during growth, while maintaining the initial shape of the embryo. I will show the extent to which Saccharina must control these parameters, especially under stochastic conditions aimed to reflect real-life fluctuations in cell turgor and in cell division time, position and orientation. In particular, I will assess the extent to which this model can account for the diversity of shapes observed in living algal embryos.

This talk is part of the Morphogenesis Seminar Series series.

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