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. 2006 Jun;18(6):1331–1337. doi: 10.1105/tpc.106.042572

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Copyright © 2006, American Society of Plant Biologists

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Figure 2. — Model for Auxin Dynamics in the IM.

(A) Auxin is transported from basal region in the stem through the L1 layer (indicated by curved arrows) and from the center out to the first primordium (P1).

(B) Auxin concentrates (dark green) at the tip of P2, while auxin in the base of the primordium is redirected back toward the center where it will be moved to the region of IM where I1 will emerge (green circle).

(C) Auxin is concentrated in I1.

(D) Auxin is redirected to center of IM from P2 and P1. Intersection of auxin flow from P1 and P2 marks the site of I2.

(E) Auxin concentrated in I2.

(F) Auxin is redirected to center of IM from P1, I1, and I2, resulting in positioning of new primordium at P4.

Existing leaf primordia are numbered P1, P2, and P3 in order of ascending age, and future (incipient) primordial are numbered I1, I2, and I3 in sequential order of appearance.