Fig. S7.
Hybrid seeds between synthetic tetraploid A. lyrata and A. arenosa resemble the hybrids between diploids, not between natural tetraploids. (A) Images of seeds obtained from controlled crosses between natural tetraploid, diploid and synthetic tetraploid A. arenosa and A. lyrata. The directionality of the cross is indicated seed parent (♀) × pollen donor (♂). (Scale bars, 1 mm.) (B) Seed viability of interspecific crosses, as measured by the rate of noncollapsed and germinated seeds. (C) Seed size for indicated crosses. (D) Seed weight for indicated crosses. Error bars represent SD between cross replicates (>2 replicates for each sample). 2A: 2x A. arenosa; 2L: 2x A. lyrata ; 4A: natural 4x A. arenosa; 4L: natural 4x A. lyrata; 4Asynth: synthetic 4x A. arenosa; 4Lsynth: synthetic 4x A. lyrata.