Fig. 2.

Molecular responses of the shoot apical meristem to florigenic proteins. Interaction of florigen with FD-like genes is required to promote expression of MADS-box transcription factors, one of the first molecular events occurring upon floral transition. The requirement for 14-3-3 proteins has not been demonstrated in arabidopsis and temperate cereals, and the linker protein is therefore indicated with a question mark on the top. Arrows indicate direct transcriptional activation. Dashed arrows indicate indirect transcriptional activation.