Fig. 2. sid1/ids1 mutant phenotypes. (A) Tassels of maize ids1-Burr (left), sid1-mum3;ids1-Burr (middle) and ids1-mum1;sid1-mum1;ts4-A triple (right) mutants. (B) Mature ear of sid1-mum3;ids1-Burr. Bare rachis is present in place of missing rows. (C) Fertilized ears of sid1-mum3;ids1-Burr (left) compared with ids1-Burr (right). (D) Hand section of wild-type (WT) ear spikelet. (E) Hand section of ids1-mum1 ear spikelet. Extra florets are arranged laterally in the axils of bracts. (F) Hand section of sid1-mum3;ids1-Burr ear spikelet. Floret-like structure is terminal. (G) Isolated bract surrounding ovule of sid1-mum3;ids1-Burr ear spikelet showing silk transformation at tip. (H) Wild-type tassel spikelet showing two florets (arrowheads). (I) ids1-mum1 tassel spikelet with three florets (arrowheads). (J) sid1-mum3;ids1-Burr tassel spikelet showing absence of florets. (K) ts4-A;ids1-Burr double mutant tassel (left) and ear (right). The tip of the ear is highly branched. (L) Tassel of ts4-A;sid1-mum1 double mutant. (M) Tassel of plant that is homozygous for ts4-A and sid1-mum1 but heterozygous for ids1-mum1. (N) Ear of ts4-A;sid1-mum1 double mutant (left) and of ts4-A;sid1-mum1 double mutant heterozygous for ids1-mum1 (right). Plants are siblings.