Abstract:
BACKGROUND:Sugar beet is an obligate outcrossing species. Varieties consist of mixtures of plants from various parental combinations. As the number of informative morphological characteristics is limited, this leads to some problems in variety registration research. RESULTS:We have developed 25 new microsatellite markers for sugar beet. A selection of 12 markers with high quality patterns was used to characterise 40 diploid and triploid varieties. For each variety 30 individual plants were genotyped. The markers amplified 3-21 different alleles. Varieties had up to 7 different alleles at one marker locus. All varieties could be distinguished. For the diploid varieties, the expected heterozygosity ranged from 0.458 to 0.744. The average inbreeding coefficient F(is) was 0.282 +/- 0.124, but it varied widely among marker loci, from F(is) = +0.876 (heterozygote deficiency) to F(is) = -0.350 (excess of heterozygotes). The genetic differentiation among diploid varieties was relatively constant among markers (F(st) = 0.232 +/- 0.027). Among triploid varieties the genetic differentiation was much lower (F(st) = 0.100 +/- 0.010). The overall genetic differentiation between diploid and triploid varieties was F(st) = 0.133 across all loci. Part of this differentiation may coincide with the differentiation among breeders' gene pools, which was Fst = 0.063. CONCLUSIONS:Based on a combination of scores for individual plants all varieties can be distinguished using the 12 markers developed here. The markers may also be used for mapping and in molecular breeding. In addition, they may be employed in studying gene flow from crop to wild populations.
journal_name
BMC Genetjournal_title
BMC geneticsauthors
Smulders MJ,Esselink GD,Everaert I,De Riek J,Vosman Bdoi
10.1186/1471-2156-11-41subject
Has Abstractpub_date
2010-05-18 00:00:00pages
41issn
1471-2156pii
1471-2156-11-41journal_volume
11pub_type
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