Figure 2.

Terminal flower formation is never observed in ful mutants. ful mutants show an extended flowering phase with a morphologically distinct inflorescence meristem always present that remains active (A, F). Mutants with strongly reduced fertility show inflorescences that terminate with the formation of a terminal flower as shown for the quadruple nga (B), spt-2 (C), crc-1 (D), or pi (E). When these sterile mutants are combined with ful, the formation of the terminal structure is suppressed and meristems remain active until the death of the plant (G, H, I, J).