1. Soybean Innovation Laboratory, University of Illinois, Urbana, IL 61801, U.S.A.
2. United States Department of Agriculture – Agricultural Research Service, Urbana, IL 61801, U.S.A.
3. Department of Crop Sciences, University of Illinois, Urbana, IL 61801, U.S.A.
4. International Institute of Tropical Agriculture-IITA, SARAH Campus, Lusaka, Zambia