Figure 9.

Hypotheses for Inverted Regional Polarity in Hd.

Diagrams of the adaxial surface of the Hd lemma (black) outlining the hypotheses.

(A) Induction of an inflorescence meristem. The expression of BKn3 (dark-blue hatch) results in the formation of an inflorescence meristem (pink), which then initiates floral meristems (orange) on its flanks; the palea (green) are initiated on the side of the floral meristem closest to the center of the inflorescence meristem.

(B) Underlying lemma properties. Ectopic BKn3 expression (dark-blue hatch) occurs in the lemma/awn boundary (light blue) and triggers the formation of ectopic floral meristems (orange). Palea (green) develop on the side of the ectopic floral meristem closest to the lemma/awn boundary.