Fig. 2.

Representative flow cytometric histograms illustrating all DNA ploidies found within the Sorbus complex investigated [internal standard Oryza sativa (S)]. Nuclei of both the target samples and the standard were isolated together and stained with PI. (A) combined sample of the diploid species S. aria (I), S. aucuparia (II) and S. torminalis (III); (B) diploid S. aria; (C) triploid S. leyana; (D) tetraploid S. eminens; (E) pentaploid S. cambrensis; (F) combined run including all cytotypes and the internal standard.