Abstract
The analytical results of chromosome composition of substltutional triticale lines spontaneously derived from octoploid triticales showed that all five lines examined had chromosome 2D. Preferential chromosome substitution of the 2D-2R in triticale may be due to selection advantage of the 2D for seed fertility. A genetical model on the relation between fertility and wheat chromosomes of homoeologous group 2 with 2D was presented.
