| Breeding behaviour of aneuploids in some hexaploid
Triticale1) T. TSUCHIYA Department of Plant Science, University of Manitoba, Winnipeg, Canada Chromosome numbers in the progeny of aneuploids were counted in several strains of hexaploid Triticale. The materials are the same as those reported previously: the group A,B, and C correspond to the designation of materials shown in the previous paper (TSUCHIYA 1968, WIS 27: 7-8). The results are summarized in Table 1. In the progeny of 41-chromosome plants the average frequency of 42-chromosome plants was 18.7 percent. About 50 percent progeny were 2n=41 and 26 percent were 2n=40. Telocentric chromosome was found in 3 (2.6%) out of 118 plants in the progeny of 41-chromosome plants. On an average about 80 percent progeny of 41-chromosome plants were hypoploids including 2n=39 and 39+1 telocentric. Only two (1.7%) out of a total 118 plants were hyperploids (2n=43). The breeding behaviour of 43-chromosome plants is considerably different from plant to plant and from group to group. No tetrasomic plant was obtained in group A, while 10.7 and 6.5 percent plants were 2n=44 in group B and C, respectively. In group A and C the frequency of 43-chromosome plants was only 11.1 and 10.8 percent, respectively, while it was 32.1 percent in group B. Also in group A and C about 16 percent were hypoploids, but none at all in group B. Plants with telocentric chromosome were obtained in 7.6 percent on an average among progenies of 43-chromosome plants. These results mentioned above are considerably different from those obtained in other hexaploid strains by KROLOW (1966). (Received March 4, 1968) |
| 1) This work was supported by a Research Grant from the Rockefeller Foundation (RF 65019). |