| Chromosome variations in the progenies of crosses between
aneuploids and euploids in hexaploid Triticale2)
T. TSUCHIYA3) and E. N. LARTER Department of Plant Science, University of Manitoba, Canada Chromosome numbers in the progenies of 41- and 43-chromosome plants in several strains of hexaploid Triticale were reported in previous paper (TSUCHIYA 1968b). The materials were the same strains as used for the previous study (TSUCHIYA 1968a, b) as shown in Table 1. Reciprocal crosses were made between aneuploid and euploid plants grown in greenhouse. The seed set was generally very low (Table 1); the overall average cross fertility was 26.8 percent. Chromosome numbers in the progenies of these crosses were counted with results shown in Tables 2-4. The number of plants studied was not large enough to get reliable results in each strain, therefore, a total sum was obtained by adding all data. In the cross 41 x 42 the frequency of 41- and 42-chromosome plants was 46.2% and 49.2%, respectively. Hyperploids were found in 3.1% Plants among 65 plants from this cross. The frequency of hypoploids and 41- and 42-chromosome plants was 31.0% and 63.6%, respectively, in the reciprocal cross, 42 x 41. No hyperploid was observed among 42 plants in this cross. These results suggest lower transmission of 20-chromosome gametes through the male than through female. |
| 1) Contribution No.174 of the Department of Plant Science, the University
of Manitoba, Winnipeg, Canada. 2) This work was supported by Research Grants from Rockefeller Foundation (RF 65019) and National Research Council of Canada. 3) Presently, Associate Professor of Department of Agronomy, Colorado State University, Ft. Collins, Colorado 80521, U.S.A. |
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