ABSTRACT
In the late 1990s Nevin Young expressed a cautious optimism for the future of marker-assisted breeding (Young 1999). Although marker-assisted selection (MAS) for soybean cyst nematode (SCN; Heterodera glycines) resistance in soybean (Glycine max L. Merr.) was used as a case study on how genotypebased selection could be useful and cost-effective to a plant breeder, the reader was reminded that to get to that point, a great deal of time and money had been invested in refining the tools and techniques used. In addition, Nevin Young pointed out that crossovers occasionally occurred between the most important resistance locus and the nearest useful marker, and that no SCNresistant public cultivars developed using MAS had yet been released.
