Figure 1
Shoot meristem development in Arabidopsis wild-type and zll mutants. A. Stem cell termination phenotypes in zll-1 Landsberg erecta (Ler) mutants. Seedlings show either a wild-type-like meristem (WT-like), stem cell termination after the formation of two leaves (2L), a single central leaf-like organ (SL), a single central filament (FIL) or a flat apex without any organ formation (NM). Bar = 2.5 mm. B. Most zll-1 Columbia-0 (Col) seedlings cannot be phenotypically discerned from Col WT. Similarly, the zllago10-1 Col mutant appears WT-like in the vast majority of seedlings and stem cell termination is not enhanced by mutations in the Col ERECTA (ER) gene, such as er-103. Bar = 2.5 mm. C. Frequency of stem cell termination phenotypes in the F2 progeny of crosses between Ler zll-1, Ler-0 and Col-0. Abbreviations as per A. D. Mature embryos stained with propidium iodide show subtle differences in the number of L1 cells (red dots) between Ler-0 and Col-0. The width of the meristem is SAM, shoot apical meristem, C, cotyledon indicated with arrows. Bar = 25 μm.