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Fig. 1. Representative phenotypes of seedlings homozygous for the tpl-1 mutation. (A) Wild-type seedling. (B) tpl-1 homozygote that has developed a single cotyledon and lacks a shoot apical meristem. (C) tpl-1 homozygotes that has developed a cup-shaped cotyledon and no shoot apical meristem. (D) tpl-1 homozygote that has developed with no detectable cotyledon tissue or shoot apical meristem. (E) tpl-1 homozygote that has developed both an apical (a) and a basal (b) root. Scale bars: 1 mm.