|Jamago, Joy - UNIVERSITY OF ILLINOIS|
Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 14, 2006
Publication Date: November 13, 2006
Citation: Jamago, J.M., Nelson, R.L. 2006. Relationship between seed yield and seed protein in high protein soybean populations. In 2006 Agronomy Abstracts. ASA,Madison, WI.[CD-ROM computer file] Technical Abstract: Soybean seed yield and protein concentration often show a strong negative correlation. Initial results of our study indicate that development of soybean lines with high yield and high protein concentration is possible by selecting for protein concentration first. We evaluated the relationship of yield and protein among high protein F2 families and F3:5 lines derived from these families, and assessed the efficiency of selecting for yield within high protein heterogeneous populations. High protein F2 plants were selected from populations made from crosses between high protein and high yielding parents. F2:3 lines that have either high or low yield, comparable maturity, and high protein concentration were selected. A total of 270 F5 lines from nine F2 families were evaluated in 2004. Lines have high protein concentration and although yield differences were not evident among means of F5 lines, they were apparent among F5 lines within each F2 family. To evaluate yield differences within and among F2 families, five high-yielding and five low-yielding F5 lines were selected from each F2 family. These lines were evaluated in three locations in Illinois in 2005 in RCBD with a split-split arrangement of treatments. These lines will be evaluated again in 2006. Our initial results show that selected lines are consistently high in protein and of comparable maturity. Yield differences among lines within families were not consistent in most families. The highest mean yields of F5 lines were approximately 500 kg/ha less than the high yielding check cultivars but protein concentrations were more than 80 g/kg higher.