Abstract
1. In the present report, the germination of F2 seed, the external characteristics, fertility and the number of somatic chromosomes of trigeneric triple F2 hybrid (TdurHR F2) raised from (Triticum durum×Haynaldia villosa F1)×Secale cereale were described.
2. 32 grains of F2 seed were sown in separate pots in October 1958 and 21 grains germinated and 16 of them matured (Table 1).
3. As seen in Table 2, the number of somatic chromosomes of the 16 individuals of TdurHR F2 hybrids was found to vary from 42 to 50.
4. Some individual differences were observed in the external characteristics of the F2 plants, even among the plants having the same number of chromosomes (Table 3). The culm length of most of the F2 plants tended to be shorter than that of the parental plants (F1) except in several individual cases. And there seems to be no correlation between culm length and the number of chromosomes. In general, the spikes were longer than those of the parent (F1). However, the number of spikelets per spike, spike density, length of awns and the number of florets per spikelet in almost all the F2 plants tended to be inferior to those of the parental plants (F1) respectively. And also in these characteristics, as with the culm length, there seems to be no correlation between them and the number of chromosomes. The number of tiller of F2, in 5 of 16 individuals it is found to be superior to that of the parental plant, while in the remaining 11 individuals to be inferior to that of the parent (F1). Generally speaking, the external characteristics of TdurHR F2 plants were somewhat inferior to those of the parental plants (F1).
5. One individual (TdurHR F2-19-1) of 16 F2 plants showed fertility, though it was very low and partial, while almost all the others were completely sterile.
