Fig. 2. acr4 mutant seed phenotype. (A,B) Opened siliques showing differences in seed size and texture between a wild-type (A) and homozygous (B) plant at comparable stages (12 days after pollination). Aborted ovules (arrowhead), retarded seeds (star) and seeds with epidermal outgrowths (arrow) are frequent in mutant siliques. (C,D) Comparison between mature wild-type (C) and mutant (D) seeds observed by SEM. Scale bars: 100 µm.