Figure 8.

Gravitropic response to a transient inclination (dose-response like protocol). (A) Maximal gravitropic response reached during the dynamics as function of the inclination time ΔT for θ = 45°. The blue solid line is the model prediction using τ_PIN = 13 min (τ_aux/τ_PIN = 1/2, 000 and τ₁/τ_PIN = 0, other parameters are fixed as in Figure 7). Note that the curve is not sensitive to the exact value of τ_aux/τ_PIN and τ₁/τ_PIN as long as these values are small. Note also that the curve does not depend on $\mathcal{P}$ in the limiting pool regime $\mathcal{P}\ll 1$ considered. Symbols correspond to the results of Chauvet et al. (2019) obtained under normal Earth gravity (1g) and hypergravity condition (3g). (B) Evolution of the tip angle after an inclination θ = 50° predicted by the model with the same parameters (blue solid line) and in the experiments of Chauvet et al. (2016) (orange thick line). The predicted model must be shifted by a constant time τ_reac = 13 min to match the experimental curve (dashed blue line). Inset: early time behavior of the gravitropic response predicted by the model in log-log scale.