Fig. 3. Somatic metaphase chromosomes from root-tip cells and fluorescent genomic in situ hybridization of Maier regenerants from callus obtained on 2.0 mg L^–1 dicamba. (A) 28 somatic chromosomes; (B) A 28-chromosome cell counterstained with propidium iodide (PI); and (C) Same cell as (B) hybridized with total genomic DNA of Triticum urartu and detected with fluorescein isothiocyanate (FITC). Brightly lit chromosomes belong to the A genome, while the faded chromosomes are from the B genome.