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. 2010 May 18:11:41.
doi: 10.1186/1471-2156-11-41.

Characterisation of sugar beet (Beta vulgaris L. ssp. vulgaris) varieties using microsatellite markers

Marinus J M Smulders  1 , G Danny Esselink, Isabelle Everaert, Jan De Riek, Ben Vosman
Affiliations

Characterisation of sugar beet (Beta vulgaris L. ssp. vulgaris) varieties using microsatellite markers

Marinus J M Smulders et al. BMC Genet. .

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.

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Figures

Figure 1
Figure 1
Neighbour-joining tree based on pairwise genetic distances between sugar beet varieties. The genetic distances were calculated using dominant scoring of alleles. The names of the varieties are followed by their ploidy level: 2 = diploid (2n = 2x), 3 = triploid (2n = 3x).
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