Soybean Genomics: Developments through the Use of Cultivar “Forrest”
Figure 3
Genetic systems used with Forrest
germplasm and the inbred soybean crop (a). The ancestry
of Forrest and Hartwig showing the known cultivars that were crossed and the
relationship between Flyer and Williams 82 (b). A diagram showing how NILs
derived from RILs fix most loci but allow the continued segregation of
heterozygous regions in inbred crops like soybean. The effect is to Mendelize a
few of the loci contributing to QT while causing the majority to be fixed. A dark pod parent was crossed with a light colored pod parent;
the F1 heterozygous type (shown as purple pods) was selfed; and F2 progeny was advanced to the F5 by selfing. A
heterozygous plant at any time or heterogeneous RIL at or later
identified is shown as purple pods. Single plants are extracted and seed increased. NILs that
result may fix the heterogeneous region to the parent 1 allele, the parent 2
allele, or are still heterogeneous. Occasionally heterozygous plants are found
within some heterogeneous NILs even at the and the progeny of
such plants can be used to find new recombination events. Shown are the results
with Satt309 and NIL11 plant 3 and eighteen of the progeny collected from it
(adapted from [40]).
