Chromosome pairing in auto-allotetraploid (AAAB) interspecific hybrid potatoes

Figures & data

Figure 1. Chromosome pairing and segregation in interspecific auto-allotetraploid hybrid potato. A, Metaphase I in stbr1 with 1IV, 5III, 11II, 4I. B, Metaphase I in stbr3 with1III, 21II and 3I. C, Late anaphase I and early telophase I with unequal (22–26) distribution of chromosomes in stbr1. D, Telophase II in stbr2 with 23–23/25–25 chromatids segregation.

Table 1. Chromosomes pairing configuration in metaphase I of three tetraploid interspecific hybrids between S. stoloniferum × S. tuberosum (stbr).

Chromosome pairing configuration
Hybrid	No. of cells	Monovalent	Divalent	Trivalent	Tetravalent
Stbr1	65	9.08 ± 3.18 3–17	15.12 ± 2.3 11–18	2.08 ± 1.41 0–4	0.625 ± 0.31 0–4
Stbr2	27	5.6 ± 1.415 1–13	14.4 ± 0.986 11–20	0.875 ± 0.213 0–2	1 ± 0.288 0–2
Stbr3	39	5 ± 2.4 1–8	16 ± 1.94 13–19	2.7 ± 1.15 0–4	0.7 ± 0.35 0–3

Table 2. The percent of different segregation in first meiotic division of two interspecific hybrid potatoes.

Hybrid	Segregation
	24–24	23–25	22–26	21–27
Stbr1	22.5	41.9	25.8	9.6
Stbr3	42.3	38.4	7.6	11.5