3.3 QTL Mapping of Leaf Metabolites
Only one tested compound, gentisyl alcohol 5-O-glucoside levels, yielded significant QTL. Three QTL intervals containing a total of 56 significant markers were significantly associated with gentisyl alcohol 5-O-glucoside levels (Table 2, Figure 4d). This included markers on chromosome 17 (marker position = 21.54739208, p-value < 0.0001) which explained 25.8% of variation, Chr10 (marker position = 109.8469079, p-value < 0.0001) which explained 23.1% of variation, and chromosome 14 (marker position = 91.51828521, p-value = 0.0100) which explained 7.30% of variation. The positive allele that contributed to an increase in gentisyl alcohol 5-O-glucoside levels for all markers was derived from P. trichocarpa .