ISHS Acta Horticulturae 603: VIII International Conference on Grape Genetics and Breeding
COMPARATIVE MOLECULAR MAPPING IN SEGREGATING POPULATIONS OF GRAPEVINE |
| Authors: | E. Zyprian, R. Eibach, R. Töpher |
| Keywords: | Molecular markers, genetic mapping, linkage/recombination analysis, QTL analysis, integrated map, Plasmopara viticola, resistance, genetic resources |
| Abstract:
Molecular mapping has been performed in two crossing populations of grapevine segregating for fungal disease resistance and agronomic traits. One test population, "Regent" x "Lemberger", has been analyzed with a large variety and high number of molecular markers leading to a well established genetic map in linkage/recombination analysis. Details of this work are presented elsewhere (FISCHER et al., this volume). A second test population, derived from the crossing of "Gf.Ga-47-42" x "Villard blanc" differs from the population "Regent" x "Lemberger" with regard to the origin of fungal disease resistance factors (only "Regent" carries resistance traits in the first population, while both parental types contribute fungal disease resistance characteristics in the second population) and the specific segregation of aroma compounds (cf. Eibach et al., this volume). The number of full sib individuals analysed in both populations is similar, but in the "Gf.Ga-47-42" x "Villard blanc" a smaller number of molecular markers has been mapped so far. The preliminary partial map obtained from the second population is well suited to start homologization of linkage groups across both populations, leading to the development of an integrated consensus map for grapevine. In addition, some quantitative trait loci could be mapped in both test populations. From these first analyses it may be concluded that quantitative resistance to Plasmopara viticola, the causal agent of downy mildew, is determined by different genetic factors in both segregating populations, indicating a different genetic origin of the resistances | |
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