Figure 1. Genetic improvement using
conventional and molecular methods.
(A) Representative scheme displaying
the generation of a back-cross breeding population by using traditional methods
and marker-assisted selection.
(B) Graphical representation of a
population obtained by back-crossing through graphical genotypes (GGT) versus a
population generated using marker-assisted selection. The proportion of parental
genome is recurrent in the regions of the chromosome that flank the gene of interest,
indicating that the assisted selection of molecular markers achieves the same conversion
level in only two back-crosses. Through the conventional methods, this would be
achieved after approximately 100 back-crosses. Adapted from Ribaut and Hoisington,
(1998). |