HOMOEOLOGOUS RELATIONSHIP OF RYE CHROMOSOME VI WITH TWO HOMOEOLOGOUS GROUPS FROM WHEAT

On the basis of its property to genetically compensate for chromosomes of homoeologous group 3 of wheat (T. aestiυum L. em. Thell.), it is suggested that Secale cereale L. chromosome I (as originally designated by Evans and Jenkins, 1960; later as VI by Riley and Macer, 1966) be redesignated as 3R. This would bring to a total of four the number of chromosomes of rye whose homoeologous relationship with wheat is known, viz. 2R, 3R, 5R and 6R.In addition to its compensating properties for group 3, 3R also exhibited partial homoeology for homoeologous group 1, specifically with chromosome ID. As a possible explanation for this behavior, it is suggested that 3R is a translocated chromosome constituting one of the three translocations known to differentiate the chromosome complements of S. cereale and S. montanum.