Phenotypes of double mutants between waf1 and sho. A, C, and E, waf1-2 sho1-1. B, D, and F, waf1-1 sho2. A and B, Germination of double mutant seeds. The shoot does not emerge, but the seminal root is elongated. C and D, Longitudinal sections of germinating double mutant embryos. A shoot-like structure is not formed. E and F, Double mutant seeds from which the seminal root started elongation but soon arrested (arrows). Bars = 500 μm. [See online article for color version of this figure.]