1. Department of Plant, Soil and Microbial Sciences Michigan State Univ. 1066 Bogue St. East Lansing MI 48824
2. Makerere Univ. Regional Center for Crop Improvement College of Agriculture and Environmental Sciences Makerere Univ. P. O. Box Kampala 7062 Uganda
3. National Crop Resources Research Institute Namulonge. P. O. Box Kampala 7084 Uganda
4. Department of Biochemistry & Molecular Biology MSU‐DOE Plant Research Lab 612 Wilson Rd East Lansing MI 48824