Fig. 1. Quantitative trait loci associated with foliar late blight (LB) resistance of a S. microdontum-derived population on linkage group 21 for 1999, 2000, and joint analysis. Primer sequences of the SSR marker ST3334 were published by Ashkenazi et al. (2001), Stm by Milbourne et al. (1998) and ST13ST by Sandbrink et al. (2000).