Fig. 2
Analysis of irregular male and female sporogenesis in natural and hybrid Ranunculus plants. a.) Boxplot analysis of percentages of erroneous male meiosis of all three generations. Comparison of diploid and polyploid PMCs revealed a significantly increased frequency of abnormal sporogenesis in polyploid-derived samples (p = 0.012, Mann-Whitney-U test). b.) Abnormal microsporogenesis depicted for all di- and polyploid hybrid plants, of which allopolyploids showed significantly more irregularities during development than homoploid individuals (p = 0.003, Mann-Whitney-U test). c.) F2 hybrid plants showed different percentages of irregular sporogenesis depending on the sex and ploidy. Statistical comparison of male and female failure in sporogenesis irrespective of ploidy showed a significantly higher frequency of error in female tissue (p < 0.001, Mann-Whitney-U test). Outliers are marked as filled circles, the box represents the interquartile range and in the boxplots the median is displayed