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A Dynamical Phyllotaxis Model to Determine Floral Organ Number

Fig 3

Merosity of the first whorl.

A, B. The number of primordia before the first arrest (arrowheads in Fig 2C and 2E) is depicted by colors in the legend. The red region indicates a non-whorled pattern. For simplicity, we set P_MP = 0 (Eq 4) so that primordia could not move against the potential gradient U_{g, k}. λ_ini = λ_g = 10.0, σ_r = σ_θ = 0.05. α = 0.0 (A) and α = 2.0 (B). The four panels between A and B are representative examples of each merosity where the arrowhead indicates the third primordium. C. Phase diagram of the first-whorl merosity according to α and R₀/Vτ at $V\tau =(-0.5R_0+50)/\sqrt{2\pi }$ (white line in A). The color code is the same as that in A and B. The region of dimerous arrangement (green) increases as α increases, because the previous primordium becomes the most dominant inhibitor so that the new primordium initiates just opposite to the previous one and its growth is arrested by the second previous one.

doi: https://doi.org/10.1371/journal.pcbi.1004145.g003