Fig. 2From: Low pyrrolizidine alkaloid levels in perennial ryegrass is associated with the absence of a homospermidine synthase geneLocation of the DHS and HSS genes on linkage group 4 in perennial ryegrass, determined by genetic linkage analysis. Map distance in centimorgans is shown at the left and marker names to the right. Bold markers represent framework SSR markers [32]Back to article page