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Early embryo development in diploid and tetraploid A. lyrata, A. arenosa, and reciprocal hybrids. The microscopy pictures show cleared seeds where the embryo and endosperm nuclei are visible. Embryo stages depicted are representative for the average embryo stage observed. The directionality of the cross is indicated seed parent (♀) × pollen donor (♂). 2A: 2x A.arenosa; 2L: 2x A. lyrata; 4A: 4x A. arenosa; 4L: 4x A. lyrata. (Scale bars, 20 µm.)
