Model for Baf1 Function in Axillary Meristem Initiation.
In developing inflorescences, the expression of the suppressed bract marker Zyb15 (P1, in blue) is followed by the expression of Baf1 in a boundary domain (P2, in red). Baf1 is required, together with other unknown factors, for proper expression of Ba1. Ba1 triggers axillary meristem initiation at the axils of the suppressed bracts (P2) and the establishment of a population of meristematic cells, expressing Kn1 (in green). IM, inflorescence meristem; AM, axillary meristem. P1, P2, and P3 mark suppressed bract primordia, with P1 marking the youngest primordium.