Population structure and genetic diversity in elite sugar beet germplasm investigated with SSR markers |
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Authors: | Jinquan Li Britta Schulz Benjamin Stich |
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Institution: | 1.Max Planck Institute for Plant Breeding Research,Cologne,Germany;2.KWS SAAT AG,Einbeck,Germany |
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Abstract: | The assessment of genetic diversity and structuration of germplasm is essential for the efficient organization of breeding
material. The objectives of the study were to (i) examine the population structure of elite sugar beet germplasm, (ii) investigate
genetic diversity within and among subgroups of elite sugar beet germplasm, and (iii) assess the extent of linkage disequilibrium
(LD) within elite sugar beet germplasm. A total of 111 and 178 inbred lines from the seed and pollen parent (SP and PP) heterotic
gene pools, respectively, which had been genotyped with 23 SSR markers, were used in this study. Two distinct subgroups were
detected within the entire germplasm set by STRUCTURE and principal coordinate analysis (PCoA). This observation was not expected
because the SP heterotic pool of sugar beet was developed out of the PP heterotic pool in the late 1970s. Our observation
of high LD in elite sugar beet germplasm suggests that association mapping will be possible in the examined germplasm set
using a relatively low numbers of markers. However, to reduce the problem of false-positive marker-phenotype association,
it might be necessary to examine the subgroups separately or apply association mapping methods which take into account this
structure. |
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