Evaluation of seven stiff-stalk and five non-stiff-stalk corn populations, hybrids, and S1's
Performance of corn (Zea mays L.) breeding programs is based on germplasm selection of breeding populations and the ability to recognize and utilize heterotic patterns. The objective of this research is to identify superior corn populations that could be useful germplasm sources in producing inbreds for hybrid corn production. Population hybrids were produced using seven Stiff-Stalk and five Non-Stiff-Stalk populations. The 35 F1 hybrids and the original 12 populations were evaluated in an S0 randomized complete block design experiment at five locations in Iowa during 2003 and 2004. Concurrently, each of the 35 hybrids and 12 populations were selfed and evaluated in an S1 experiment at the same locations and years. Data were collected for grain yield, grain moisture, root and stalk lodging, and plant and ear height for both S0 and S1 experiments. Analysis of variance was performed following the Gardner and Eberhart Analysis II model. General combining ability (GCA) and specific combining ability (SCA) were calculated for each population and population hybrid respectfully. The population hybrid of BS10(FR)C14/BS29(R)C3 showed the most potential. This cross of Corn Belt germplasm with exotic germplasm was the best population hybrid. BSSS(R)C14 had the highest GCA for grain yield of the Stiff-Stalk populations. BSCB1(R)C14 and BS11(FR)C14 had the highest GCA for the Non-Stiff-Stalk populations.