Fig. 3. The internal structure of acr4 mutant ovules. Wild-type (A) compared with mutant (B,C,D) ovules. Micropyles are indicated by arrowheads. Female gametophytes (fg) and densely staining endothelial cells (e) are labelled where present. (A) In wild type neatly organised cell layers are visible, with the female gametophyte (fg) surrounded by an orderly endothelium. (B) Mutant ovule with weak phenotype. Fg is visible but outer integument is disrupted (to left of star). Endothelial layer is visible. (C) Mutant ovule with intermediate phenotype showing disorganised cell layers and replacement of fg with divided cells. (D) Two fused (star) mutant ovules with extreme phenotypes. Both show cell layer disorganisation but one has distinguishable (probably abnormal) fg. Scale bar: 25 µm.

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