Figure 3.

Characterization of the stp Mutant Phenotype.

(A) Primary inflorescence of an stp-4 plant apparently terminating in a sepaloid flower (arrowhead). The final leaf produced on this primary inflorescence is unifoliate.

(B) Primary inflorescence from an stp-4 plant that has released additional axillary shoots from suppression. Three axillary shoots are visible at each node. Arrowhead 1 indicates the secondary infloresence bearing a flower. Arrowhead 2 shows a lateral shoot bearing a leaf and a terminal sepaloid flower. Arrowhead 3 indicates the developing third axillary bud. A similar pattern is seen in all three nodes illustrated.

(C) Seedling phenotype of stp-4, wild type (WT), and uni-224. A scale-like leaf in stp-4 mutants (arrowheads) replaces the first compound leaf produced at node 3 on wild-type plants. In contrast, uni-224 seedlings possess unifoliate leaves at all early nodes (arrow).