Regensburg 2022 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 14: Active Matter 3 (joint session BP/CPP/DY)
BP 14.10: Vortrag
Mittwoch, 7. September 2022, 12:15–12:30, H16
Intercellular transport in Chara corallina — •Florian von Rüling1, Anna Alova2, Alexander Bulychev2, and Alexey Eremin1 — 1Otto von Guericke University Magdeburg, Germany — 2Moscow, Russia
We explore the kinetics of the intercellular transport between the giant cells of characean algae. The transport involves advection via cytoplasmic streaming and diffusion through the plasmodesmata, pores that penetrate the cell walls. Using fluorescent dye as a tracer, we measure the permeation through the node of tandem cells. The permeability is extracted from the experimental data using an advection-diffusion model. The current work is focused on the roles of cytoplasmic streaming and the nodal cells in the transport mechanism. To separate the diffusive permeation from the advective contribution, cyclosis was temporarily inhibited using action potentials. Streaming cessation results in dye accumulation in the vicinity of the node. The shape of regions with high dye concentration indicates that action potentials may induce closure of the plasmodesmata in central nodal cells.