Fig. 1

Genetics of ploidy characteristics of ‘Orange Fire’ × ‘Old Blush’. a ‘Orange Fire’. b Somatic cell chromosomes of ‘Orange Fire’. c Chromosome ploidy picture of ‘Orange Fire’ detected by flow cytometry with a fluorescence intensity of 560,660. d Flower of ‘Old Blush’. e Somatic cell chromosomes of ‘Old Blush’. f Chromosome ploidy picture of ‘Old Blush’ detected by flow cytometry with a fluorescence intensity of 252,300. g Flower of No.2 F1 (2n = 3x = 21) from ‘Orange Fire’ × ‘Old Blush’. h Somatic cell chromosomes of No.2 F1 (2n = 3x = 21) from ‘Orange Fire’ × ‘Old Blush’. i Chromosome ploidy picture of No.2 F1 from ‘Orange Fire’ × ‘Old Blush’ detected by flow cytometry with a fluorescence intensity of 381,577. j Flower of No.9 F1 (2n = 4x = 28) from ‘Orange Fire’ × ‘Old Blush’. k Somatic cell chromosomes of No.9 F1 (2n = 4x = 28) from ‘Orange Fire’ × ‘Old Blush’. l Chromosome ploidy picture of No.9 F1 from ‘Orange Fire’ × ‘Old Blush’ detected by flow cytometry and a fluorescence intensity of 497,566