Cytogenetical studies of triple hybrid from F1 Triticum turgidum× Secale cereale and Triticum vulgare
IV. Meiosis in PMC's of F2 plants
1958 Volume 33 Issue 5 Pages 146-154
Details
1958 Volume 33 Issue 5 Pages 146-154
1. The meiosis of PMC's of 35 individuals of F2 raised between two species of Triticum and Secale cereale is described.
2. The number of bivalents observed in one PMC is 11-23 at the heterotypic metaphase of Triticum-Secale triple F2 plants, and the frequency of those bivalents is shown in Table 1. And the mode of the number of bivalents was 14II in the individuals having 2n=28-32 chromosomes, 15II in those of 2n=33-37, 15II-19II in those of 2n=38-44 and 17II-21II in those of 2n=45-50. Generally, the number of bivalents increases as the number of chromosomes increases; showing that the number of homologous chromosomes will also increase when the number of chromosomes increases.
3. Trivalents or tetravalents, suggesting that the plants have 3 or 4 homologous chromosomes.
4. Triticum-Secale triple hybrids employed in the present research are of the 2nd generation raised from the hybridization between two species of Triticum and Secale cereale each of which has quite different nature. Therefore, the meiosis in PMC's is very anomalous.
