Sequence variation at theSec-1 locus of rye,Secale cereale (Poaceae)

This paper describes the structure of a 9.2-kb repeat unit of DNA, which represents one-secalin gene and spacer sequence located at theSec-1 locus on the short arm of chromosome 1 of rye. The gene units at theSec-1 locus comprise 1.1 kb representing the gene and 8.1 kb of spacer sequence separating the genes. A sequence comparison of nine genes and their promoter regions from theSec-1 locus, reveals that there is greater variation within the coding sequence than there is within the promoter regions. The gene sequence variation is discussed in terms of the size variation seen for the-secalin proteins in rye species. The results include a comparison of promoter sequences from members of the Triticeae to examine the degree of conservation between other seed storage protein genes.