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A genetic linkage map of microsatellite, gene-specific and morphological markers in diploid Fragaria

Sargent, D., Davis, T.M., Tobutt, K.R. , Wilkinson, M.J. , Battey, N.H. and Simpson, D.W. (2004) A genetic linkage map of microsatellite, gene-specific and morphological markers in diploid Fragaria. Theoretical & Applied Genetics, 109 (7). pp. 1385-1391. ISSN 0040-5752

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To link to this item DOI: 10.1007/s00122-004-1767-9


Diploid Fragaria provide a potential model for genomic studies in the Rosaceae. To develop a genetic linkage map of diploid Fragaria, we scored 78 markers (68 microsatellites, one sequence-characterised amplified region, six gene-specific markers and three morphological traits) in an interspecific F2 population of 94 plants generated from a cross of F.vesca f. semperflorens × F. nubicola. Co-segregation analysis arranged 76 markers into seven discrete linkage groups covering 448 cM, with linkage group sizes ranging from 100.3 cM to 22.9 cM. Marker coverage was generally good; however some clustering of markers was observed on six of the seven linkage groups. Segregation distortion was observed at a high proportion of loci (54%), which could reflect the interspecific nature of the progeny and, in some cases, the self-incompatibility of F. nubicola. Such distortion may also account for some of the marker clustering observed in the map. One of the morphological markers, pale-green leaf (pg) has not previously been mapped in Fragaria and was located to the mid-point of linkage group VI. The transferable nature of the markers used in this study means that the map will be ideal for use as a framework for additional marker incorporation aimed at enhancing and resolving map coverage of the diploid Fragaria genome. The map also provides a sound basis for linkage map transfer to the cultivated octoploid strawberry.

Item Type:Article
Divisions:Life Sciences > School of Biological Sciences
ID Code:10612

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