Description:
Derived from hybridization of Young, newly assigned PI 633743 and PI 416937, newly assigned PI 633742. The 116 F4-derived randomly selected inbred lines were developed using the single seed descent breeding method. All lines traced to a different random F2 plant, a population structure that facilitated maintenance of genetic variability in the population and DNA marker mapping. F1 seed were produced at Central Crops Res. Stn. at Clayton, NC in 1990; F1 plants were grown at the USDA-ARS Tropical Agr. Res. Stn., Isabela, PR, the following winter. F2 plants were advanced at Clayton, NC in 1991 and the following winter at TARS. In 1992 individual F4 plants were harvested at Clayton, NC. Progeny rows were increased at Sandhills Res. Stn. near Windblow, NC in 1993.