The Iowa State Corn Breeding Program here pursued several strategies to enhance their corn breeding populations. Three of the populations are: BSSS(R), BSSS(S) and BS13(HT) (Hallauer and Miranda, ISU Press, 1981). These have been continued for several cycles, each of which was canvassed for the presence of Uq.
The following has been determined:
BSSS(R), from a high of nearly 50% of the plants
carrying Uq at the C0 cycle, gradually decreased to near zero between
cycles 6 and 11.
BSSS(S), from a 30% low in C1, increased to near 80% by C5.
These studies are in their initial stages but do indicate a change in the presence of Uq occurring during population development.
Lisa Lorenzen1, Jean Cormack2 and Peter A. Peterson
1NSF Undergraduate Research; 2ICI-Garst
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