Linkage analysis of sugar beet (Beta vulgaris L.) was performed with r
andom amplified polymorphic DNA (RAPD)-markers. From three segregating
populations, a combined genetic map was constructed which comprises 8
5 RAPD, five isozyme, one RFLP marker and the genes for resistance aga
inst the nematode Heterodera schachtii Schm., one restorer locus for m
ale sterility and the genes for annuality and hypocotyl colour. For ma
pping of the two unlinked restorer genes a statistical model was devel
oped based on the maximum-likelihood function.