The F1,. BC1, F2 and F3 populations of two octoploid triticale X common wheat hybrids were cytologically analyzed on a plant-by-plant basis using a Giemsa C-banding technique for the transmission patterns of rye and wheat chromosomes. The data indicated that the rye chromosomes exhibited an intensive tendency to lose. The mean transmission rates of rye chromosomes ranged from 36.0% to 38.8% in the F2 and F2 populations, which were significantly lower than those through the gametes of the F1. The transmissio...