2.1 QTL mapping pedigree
The 52-124 family was developed by crossing a male Populus deltoides , ILL-101 from southern Illinois, with a female Populus trichocarpa clone, 93-968 from western Washington State. The F1 clone, 52-225, was then crossed with a malePopulus deltoides clone, D124 from Minnesota, to generate the final 749 progeny in the pseudo-backcross population.