Abstract
We have used a one-way pseudo-testcross mapping strategy in combination with different types of PCR-based markers (RAPD, AFLP, SAMPL) to construct a first linkage map for variegated chicory (Cichorium intybus L. var. silvestre Biskoff, n=9), a self-incompatible vegetable species. The success of such a strategy depends on the presence of sufficiently high levels of heterozygosity in the individual plant which is being mapped and on the informativeness of the marker system that is used. A total of 371 markers, comprising 16 RAPDs, 72 SAMPLs and 283 AFLPs, were scored in 46 F1 individuals obtained from an interspecific cross between a C. intybus outbred individual and a C. endivia inbred line. Grouping of the markers at a LOD score of 4.0 resulted in 13 linkage groups covering 1330 cM. A framework map covering 1201.4 cM was assembled by using all markers that could be ordered with a LOD greater than 2.0. We estimate the total genome size of chicory to be ca. 1405 cM, thus considerably smaller than that estimated for lettuce (1950 cM). The usefulness of the different marker systems that were applied is analysed in terms of level of heterozygosity and marker index, i.e. number of different genetic loci that may be simultaneously analysed per experiment. Out of the 371 markers, 50 of them showed segregation distortion which is discussed in terms of the hybrid origin of the variegated chicory.
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De Simone, M., Morgante, M., Lucchin, M. et al. A first linkage map of Cichorium intybus L. using a one-way pseudo-testcross and PCR-derived markers. Molecular Breeding 3, 415–425 (1997). https://doi.org/10.1023/A:1009616801404
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DOI: https://doi.org/10.1023/A:1009616801404