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Continuous emergence of phototaxis in Dictyostelium discoideum

Fig 2

Phototaxis is an emergent property of multicellularity.

Trajectories (centered from Eq (1)) and polar representations of start-end directions (from Eq (2)) of slugs (A) and cells (B and C) when exposed to light (orange) or in the dark (violet). Slug migration showed no preferential direction in the dark but was oriented towards the light source under lateral illumination (A). Vegetative cells (B) and cells from dis-aggregated slugs (C) showed no preferential direction whether in the dark or exposed to lateral light. Directional statistical analysis were computed from Eq (13) for r values and Rayleigh test for uniform angles distribution from Eq (14).

doi: https://doi.org/10.1371/journal.pone.0321614.g002