Table 8.
Relationship between the Q chromosome and hybrid lethality observed in crosses between monosomic lines of N. tabacum lacking the Q chromosome and seven species of section Suaveolentes
| No. of hybrids |
||||
|---|---|---|---|---|
| Cross combination | DNA markers* | Total | Viable | Inviable |
| Haplo-Q × N. africana | + | 16 | 0 | 16 |
| − | 56 | 56 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. africana | + | 13 | 0 | 13 |
| − | 59 | 59 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. excelsior | + | 5 | 0 | 5 |
| − | 19 | 19 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. goodspeedii | + | 12 | 0 | 12 |
| − | 18 | 18 | 0 | |
| Haplo-Q × N. gossei | + | 4 | 0 | 4 |
| − | 8 | 8 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. gossei | + | 2 | 0 | 2 |
| − | 28 | 28 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. maritima | + | 10 | 0 | 10 |
| − | 21 | 21 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. megalosiphon | + | 7 | 0 | 7 |
| − | 125 | 125 | 0 | |
| (Haplo-Q × ‘Samsun NN’) × N. velutina | + | 3 | 0 | 3 |
| − | 5 | 5 | 0 | |
*DNA markers used were QCS2 and QCS3 (Tezuka and Marubashi, 2004, 2006a). A ‘ + ’ indicates that Q-chromosome-specific DNA markers were detected and a ‘–’ indicates that they were not.