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a) Pollen stainability of F1 homoploid hybrid and early generations of C. ×hytivus. Five biological replicates of 15 male flowers randomly collected from each generation of allotetraploid C. ×hytivus were assayed for pollen stainability (mean ± 5 SD). A minimum of 2000 pollen grains were collected for each biological replicate. b) Number of missing genes in F1 homoploid hybrid and early generations of C. ×hytivus.
