Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 321067
Title Genetic structure of a population sample of apomictic dandelions
Author(s) Hulst, R.G.M. van der; Mes, T.H.M.; Falque, M.; Stam, P.; Nijs, J.C.M. den; Bachmann, K.
Source Heredity 90 (2003). - ISSN 0018-067X - p. 326 - 335.
DOI http://dx.doi.org/10.1038/sj.hdy.6800248
Department(s) Laboratory of Plant Breeding
EPS-2
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) molecular markers reveal - chloroplast dna - microsatellite markers - genotypic variation - taraxacum - recombination - polymorphism - compositae - clonality - regions
Abstract In Northern Europe, dandelion populations consist solely of triploid or higher polyploid apomicts. Without a regular sexual cycle or lateral gene transmission, a clonal structure is expected for Taraxacum apomicts, although this was not found by compatibility analysis. In this study, we investigate whether this observation could be suported by performing independent tests based on data from hypervariable microsatellite markers as well as more conservative data based on allozymes and matrilinear cpDNA markers. In addition, population genetic methods were used to test departure from panmictic expectations, which is expected for clonal populations. Results indicated that many data sets, again, did not agree with expectations from clonal evolution because only small groups of genotypes exhibit no marker incompatibility. Population genetic analysis revealed that virtually all genotypes, but not individuals, agreed with random segregation and genotypic equilibria. Exceptions were genotypes with rare allozyme alleles or nearly identical microsatellite genotypes. Consequently, a population sample of apomictic dandelions essentially harbours genotypes that resulted from segregation and/or recombination and only a few genotypes that may have differentiated by somatic mutations.
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