Fig. 3

Principal component analysis of the modified Roger’s genetic distance matrix [76] of the 338 founders (gray: points for the 57 Iodent lines and triangles for the 281 remaining lines), the commercial 10 best performing E progeny per generation (colored circle sign) and the 20 donors per generation released by the external program (colored plus sign). Both commercial and external lines are colored regarding their generation (note that negative generations correspond to burn-in). Black circles represent the donors that have been introduced into the commercial breeding program. Only three scenarios with bridging are represented for the first simulation replicate, a when only donors from panel were accessible, b when 20-year old donors from the external breeding were accessible and c when 5-year old donors from the external breeding were accessible