Fig. 2.

Bud expansion driven by cell wall anisotropy and a possible protection mechanism against two-bud growing malfunction. a Two volume model instances were interconnected via water and osmolytes fluxes. The coupled model accounts for different cell wall extensibilities ϕ between bud and mother. b Volume dynamics are shown for mother and bud for three different extensibility ratios q = ϕ_bud/ϕ_mother. Bud expansion is possible only at q > 10. c To investigate two-bud growing mutants, two bud instances linked to a mother cell were initialized with equal bud sizes. Both buds have identical volume dynamics. d Effect of unequal initial bud sizes: differences are amplified and only the larger bud grows