Fig. 1. Sepal fusion in mature flowers of single and double mutant combinations of
ptl-1, cuc1-1 and cuc2-1. (A) A wild-type (Columbia) flower.
(B) A ptl-1 mutant flower with some fusion (<1/4) of adjacent
lateral (left) and medial (right) sepals (arrow). Note aberrant shape of
sepals (deeper in profile) and the absence of petals. (C,D) Sepal fusions in
cuc1-1 (C) and cuc2-1 (D) mutant flowers (arrows). (E,F)
Near full fusion of adjacent sepals in ptl-1 cuc1-1 (E) and ptl-1
cuc2-1 (F) double-mutant flowers (arrows). Scale bar: 1 mm.