title: Distribution and evolution of two satellite DNAs in the genus Beta.
abstract: EcoRI monomers of a highly repetitive DNA family of Beta vulgaris have been cloned. Sequence analysis revealed that the repeat length varies between 157-160 bp. The percentage of AT-residues is 62% on average. The basic repeat does not show significant homology to the BamHI sequence family of B. vulgaris that was analyzed by us earlier. Both the EcoRI and BamHI sequences are investigated and compared to each other with respect to their genomic organization in the genus Beta. Both repeats were found to be tandemly arranged in the genome of B. vulgaris in a satellite-like manner. The EcoRI satellite DNA is present in three sections (Beta, Corollinae and Nanae) of the genus, whereas the BamHI satellite DNA exists only in the section Beta. The distribution of the EcoRI and BamHI satellite families in the genus is discussed with respect to their evolution.
authors.affiliation: Institute of Genetics, Martin-Luther-University Halle-Wittenberg, Domplatz 1, 4020, Halle, FRG.
authors.forename: T
authors.initials: T
authors.lastname: Schmidt
authors.forename: C
authors.initials: C
authors.lastname: Jung
authors.forename: M
authors.initials: M
authors.lastname: Metzlaff