Fig. 1. Inflorescence and flower phenotypes of ult1 mutants and complementation test. (A-D) Inflorescence meristems of (A) wild-type Ler, (B) ult1-1, (C) ult1-2 and (D) ult1-3 plants. (E-G) In situ expression analysis of STM in (E) Ler, (F) ult1-1 and (G) ult1-2 inflorescences. (H) Inflorescence and (inset) flower of ult1-1 plants transformed with the ULT1-214 construct containing a 2.7 kb ULT1 genomic fragment. (I-L) In situ expression analysis of WUS in (I) Ler, (J) ult1-1, (K) ult1-2 and (L) ult1-3 inflorescences. (M-O) Analysis of pSTM::uidA expression in (M) Ler, (N) ult1-1 and (O) ult1-2 inflorescences. (P) Quantification of WUS-expressing cells in Ler (WT) and all three ult1 alleles. The mean number of cells was calculated from the most central section of eight individual inflorescences for each genotype. For each section, the maximum number of cells found in one horizontal (width) and one vertical (height) cell file, as well as the total number of cells expressing WUS, was scored. The standard deviation is indicated. Scale bars: 50 µm.