Further studies on the synthesis of a permanent RT-heterozygote in Einkorn wheat

K. YAMASHITA

Biological Laboratory, Kyoto University Kyoto, Japan

In WIS No. 3, it was reported that an attempt to combine the lethal genes into a ring complex was in progress in Einkorn wheats, so that the plant maintains an RT-heterozygosity as (6)= d-ef^l / d^le-f, where d-e and e-f are the translocation chromosomes, d^l involves lethal-1 and f^l lethal-2, respectively. The object has been attained partly as shown in the following table.



In the former strains, in which f^l chromosome with lethal-2, namely, f^l, is not involved in the ring complex, (6)+4_II and 7_II segregated in a ratio of 1:1, while in the latter, in which f^l chromosome is involved in the ring complex, the segregation of (6)+4_II and 7_II was 2:1, indicating that half number of 7_II-segregants died off due to the balanced lethal mechanism. d^l chromosome was not combined successfully though attempted. Further studies ate in progress.

(Received Oct. 15. 1957)