| Autor: |
Krishnamurty, K. V., Murty, G. S., Rao, K. Appa |
| Zdroj: |
Euphytica; May 1960, Vol. 9 Issue: 1 p111-121, 11p |
| Abstrakt: |
The paper deals with the cytogenetics of a new three species hybrid combination obtained as a result of crossing N. tabacum with the fertile amphiploid N. glutinosa × N. trigonophylla. The amphidiploid was established through colchicine doubling of a sterile hybrid of the same parentage in 1956. The tabacum-amphidiploid cross was made reciprocally and meiosis of both the hybrids was studied. While the N. tabacum × (glutinosa-trigonophylla) hybrid showed a pairing frequency of 6.09 bivalents (2 n of hybrid: 48) the reciprocal (glutinosa-trigonophylla) × N. tabacum, showed a mean bivalent frequency of 10.07. Other stages of meiosis also revealed differences. Pollen fertility was reduced to less than 1.0% in both and the hybrids proved to be sterile although one of them, (glutinosa-trigonophylla) × N. tabacum, exhibited a heavy setting of parthenocarpic capsules. In spite of continued failures, germination could be induced in a single seed of a backcross between N. tabacum × (glutinosa-trigonophylla) and N. tabacum. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink