Fig. 1
The distribution of the total number of chromosomes in karyotypes and rDNA-bearing chromosomes in 90 plants of F2 generation of F. pratensis × L. perenne hybrid – in combination no. 1 (a) and in combination no. 2 (b). At the top of both graphs were shown results for parents – two parental plants: P (Fp 11/59) (♀), P (Lp 08/33) (♂); four F1 plants: two plants – F1 6-2A (♀), F1 6-7A (♂) for combination no. 1 of F2, and two plants – F1 6-2A (♀), F1 6-3B (♂) for combination no. 2 of F2. On the y-axis obtained rDNA patterns (Roman numerals) and their frequency in the brackets (Arabic numerals) were shown. On x-axis were presented: a total number of chromosomes divided into two groups – Festuca and Lolium chromosomes, as well as the number of particular rDNA-bearing chromosomes