TABLE 1.
Length, arm ratio, percentage of heterochromatin, knob, and centromere position of potato (USW1 and RH) and tomato chromosome 6
| Genotypea | n | Total chr. length (μm) | LAa (μm) | SAa (μm) | Arm ratio | Het. totalb (%) | Het. LA (%) | Het. SA (%) | Knob positionc (%) | Cen positionc (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| S. tuberosum (RH) | 11 | 47.2 ± 2.9 | 37.9 ± 2.5 | 9.3 ± 0.9 | 4.1:1 | 27.0 ± 4.1 | 20.5 ± 3.9 | 53.3 ± 5.8 | 49.7 ± 2.4 | 19.7 ± 1.5 |
| S. tuberosum (USW1) | 16 | 42.8 ± 3.8 | 34.1 ± 3.4 | 8.8 ± 0.7 | 3.9:1 | 27.7 ± 2.9 | 21.3 ± 3.5 | 52.4 ± 4.9 | 53.6 ± 4.3 | 20.5 ± 1.5 |
| S. lycopersicum (Koralik) | 11 | 45.5 ± 3.9 | 37.2 ± 3.7 | 8.7 ± 0.7 | 4.3:1 | 26.8 ± 2.6 | 22.5 ± 3.1 | 44.9 ± 2.9 | NA | 19.2 ± 2.4 |
a
LA, long arm; SA, short arm.
b
[Total heterochromatin (μm)/total chromosome length (μm)] × 100.
c
Knob (centromere) position (%) is (S/T) × 100, where S = distance of knob (centromere) (in micrometers) from the end of the short arm, and T = length of chromosome 6 (in micrometers). NA, the knob was not observed in tomato.