Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/21/1999
Publication Date: N/A
Technical Abstract: Diversity among 19 historically imported sugar beet accessions released over the first 50 years of public breeding in the United States was examined to gain a baseline of genetic diversity and to gauge the effect of breeding on the loss or gain of genetic diversity over this period. Accessions were chosen from each of the geographic breeding areas contributing to the U.S. germplasm pool and their presumed ancestors from Europe. Four additional representatives from the presumed wild ancestors of beets, Beta vulgaris ssp. maritima, were also included. Using 69 polymorphic RAPD fragments for gene frequency analysis, Nei's diversity statistics were determined within and among groups of accessions. In general, heterozygosity within releases declined with time but total genetic diversity in the U.S. germplasm pool remained constant. Wild accessions were well differentiated from sugarbeet.