Additional file 4. The number of chromosomes in the hexaploid sample and the flow cytometry results. a Flow cytometry diagram of 3850. b Chromosome number of 3850, 2n = 54. c Flow cytometry histogram of HZ1. d Chromosome number of HZ1. e Flow cytometry histogram of HZ4. f Chromosome number of HZ4, 2n = 52. Scale bar:10 μm.