Table 3.
Viability of hybrid seedlings between N. tabacum and eight species of section Suaveolentes at 28 °C
| No. of hybrids |
||||
|---|---|---|---|---|
| Cross combination | No. of hybrids cultured | Viable | Inviable | Lethality type* |
| N. africana × ‘Red Russian’ | 114 | 0 | 114 | II |
| ‘Red Russian’ × N. africana | 115 | 0 | 115 | II |
| N. africana × ‘Samsun NN’ | 69 | 1 | 68 | II |
| ‘Samsun NN’ × N. africana | 103 | 0 | 103 | II |
| N. excelsior × ‘Red Russian’ | 113 | 0 | 113 | II |
| ‘Red Russian’ × N. excelsior | 61 | 0 | 61 | II |
| N. excelsior × ‘Samsun NN’ | 108 | 0 | 108 | II |
| ‘Samsun NN’ × N. excelsior | 78 | 0 | 78 | II |
| ‘Samsun NN’ × N. fragrans | 100 | 100 | 0 | – |
| N. goodspeedii × ‘Red Russian’ | 158 | 0 | 158 | II |
| N. goodspeedii × ‘Samsun NN’ | 113 | 0 | 113 | II |
| N. gossei × ‘Red Russian’ | 186 | 0 | 186 | II |
| ‘Red Russian’ × N. gossei | 3 | 0 | 3 | II |
| N. gossei × ‘Samsun NN’ | 93 | 0 | 93 | II |
| ‘Samsun NN’ × N. gossei | 20 | 0 | 20 | II |
| N. maritima × ‘Red Russian’ | 132 | 0 | 132 | II |
| N. maritima × ‘Samsun NN’ | 117 | 0 | 117 | II |
| N. megalosiphon × ‘Red Russian’ | 166 | 1 | 165 | II |
| ‘Red Russian’ × N. megalosiphon | 4 | 0 | 4 | II |
| N. megalosiphon × ‘Samsun NN’ | 84 | 0 | 84 | II |
| ‘Samsun NN’ × N. megalosiphon | 6 | 0 | 6 | II |
| N. velutina × ‘Red Russian’ | 113 | 0 | 113 | II |
| N. velutina × ‘Samsun NN’ | 109 | 0 | 109 | II |
*Type I, browning of shoot apex and root tip; Type II, browning of hypocotyl and roots; Type III, yellowing of true leaves; Type IV, formation of multiple shoots (Yamada et al., 1999).