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Molecular maps and DNA libraries are now possible to construct in nearly every horticultural crop. Comparison of linkage relationships both within and among families of flowering plants is giving us the capability to predict where genes will be even in crops lacking linkage maps. The dissection of quantitative traits into Mendelian components has been successfully performed in many crops, and candidate genes have occasionally been matched with QTLs or morphological mutations on the basis of map position. Breeders are now able to predict what combination of traits will be difficult to achieve as a result of repulsion phase linkage and what traits might be associated with problems due to linkage drag. Maps and libraries also help in identification of homologous genes in different species and gene-rich regions within a chromosome. More generally, DNA libraries are giving us access to every gene in a genome, leading to much more powerful studies concerning the anatomy, ontogeny and physiology of horticultural crops.

650 How are Molecular Maps and DNA Libraries Being Used for Genetics and Germplasm Research of Horticultural Crops?