Fig. 2. Atmnd1 mutant plants develop short siliques and no regular pollen grains. (A) Atmnd1 plants look like wild-type plants, except that they have shorter and empty siliques. The left panel shows a stem with full-grown siliques of a wild-type plant (wt). The middle panel shows the stem of an Atmnd1 plant of the same age, which failed to develop siliques (Atmnd1). The right panel shows an Atmnd1 homozygous mutant plant, transformed with a wild-type copy of the genomic AtMND1 region and showing restored fertility. (B) Anthers of wild-type (left panel) and Atmnd1 (right panel) plants stained according to Alexander (Alexander, 1969). The purple-stained cytoplasm indicates viable pollen grains. Atmnd1 plants did not develop regular pollen grains.