Triticum orientale×Secale africanum F₁ と T. Spelta×S. montanum F₁ の細胞遺伝学的研究

抄録

1. Cytogenetical researches were carried on the F₁ plants raised between T. orientale× S. africanum (ToriSaF₁) and T. Spelta×S. montanum (TSpeSmF₁). 2. The percentage of the matured F₁ plants to the number of pollinated flowers in these hybrids were 0.87 and 1.38 percent respectively. 3. The external characteristics of ToriSaF₁ plants resembled somewhat to the pollen plant, while TSpeSmF₁ to the mother plant than being the intermediate of both parents (photos. 1-2, Table 2) in both cases. 4. ToriSaF₁ plant showed fertility, while TSpeSmF₁ was completely sterile (Table 2). 5. In the 2 F₁ hybrids, the number of bivalents at heterotypic metaphase of PMC's is given in Table 3 and 5. 6. The number of bivalents, for ToriSaF₁ up to 3 and for TSpeSmF₁ up to 7, may be chiefly due to the autosyndesis of chromosomes of AB (ToriSaF₁) or ABD (TSpeSmF₁) genomes. In these bivalents of TSpeSmF₁, however, bivalents produced by conjugation of the chromosomes of S. montanum may have been involved. 7. In these F₁, the formation of equatorial plate in heterotypic metaphase of PMC's was observed in some individuals, in addition to the normal F₁-type division commonly observed in the wheat-rye F₁ hybrids. The frequency of the formation of equatorial plate is given in Table 4 and 6.