A procedure was developed for marker-assisted selection of complex traits for common bean (Phaseolus vulgaris L.) using an index based on QTL-linked markers and ultrametric genetic distances between lines and a target parent. A comparison of the mean seed yields of the top five lines selected by different schemes demonstrated that the highest yielding group was selected on the basis of a combination of phenotypic performance and a high QTL-based index, followed by groups identified by a high QTL-based-index, conventional selection, and a low QTL-based-index. This study demonstrated a simple way to use information obtained from QTL studies to make selection decisions. The study also showed that the use of the QTL-based-index in conjunction with the ultrametric genetic distance to the target parent would enable a plant breeder to select lines that retain important QTL in a desirable genetic background. Therefore, this type of MAS would be expected to be superior to the phenotypic selection.
Bibliographical noteFunding Information:
The work was supported by the Ontario Ministry for Food, Agriculture and Rural Affairs, the White Bean Marketing Board and the Natural Sciences and Engineering Research Council of Canada. Thanks to Tom Smith for help with the fieldwork and to Angela Hill with the preparation of the manuscript.
- Common bean
- Genetic distance
- Marker-assisted selection
- Quantitative trait loci