Figure 7.

Model for Auxin Minimum Formation and Axillary Meristem Initiation.

(A) Convergent localization of PIN1 proteins leads to an auxin maximum (max, in green) where a new leaf primordium will form (IP).

(B) After the leaf primordium starts to grow, PIN1 will be localized toward the tip of the leaf primordium (P) and the SAM, and auxin gradients are generated.

(C) After leaf primordium elongation, auxin will be transported out of the axil region and an auxin minimum (min, blue circle) will form in the leaf axil.

(D) An AM (yellow circle) is formed in the low-auxin region. Arrows indicate PIN1-mediated auxin flux.