抄録
In this experiment the writers tried to synthesize 6x-amphidiploids by artificial hybridization between T. Timopheevi ZHUK. and Aegilops comosa SIBTH. et SM., with the aim to combine the leaf-rust resistant genes that were possessed separately by these two species iinto a single one, and to make this new wheat a good source of resistance to leaf-rust in wheats. By applying 0.05% colchicine solution to the F1 seeds a number of mature amphiploids were obtained successfully in addition to two aneuploids, one showing 2n = 41 (monosoItnic), and the other, 2n=43 (trisomic). In the root-tip cells of F1 plant, 21 somatic chromosomes were confirmed, which obrre, spond to the sum of reduced numbers of their parents, and in those of amphidiploids 42 chromosomes were clearly counted corresponding to the multiple number of chromosomes of F1 plant.
