抄録
1. In the present investigation the chroirlosomes of 3species of genus Secale viz..S. africanum, S. montauum and S. Vavilovii were examined. . 2. The chromosome number of genus Secale was n=7 and 2n=14. 3. The bivalents at the heterotypic metaphase of PMC-s, were ring-and stick-shaped in the 3 species, the former ones being more frequently observed than the latter. 4. At the heterotypic metaphase of PMC-s S.montanum, 14 bivalents were observed rarely (one tiine in 1000 PMC-s). This case ought tobe due to the duplication of 14 univalents at anearly stage of meiotic division in PMC-s5. At the heterotypic metaphase of PMC-s.., of S. Vavilovii, one of 7 bivalents was occasionaly divided into two elements earlier than the others, so that it was observed as two univalents even in metaphase (Figs. 18, 19).The percentage of occurrence of one bivalents being divided onto two elements to ail the number of PMC-s. ibserved was 8.8percent(18 times in 203 PMCs).
