1. Department of Food Science and Human Nutrition, 2312 Food Sciences Building, Iowa State University, Ames, IA 50011.
2. SADC/ICRISAT Sorghum and Millet Improvement Program, Matopos Research Station, Box 776, Bulawayo, Zimbabwe.
3. Department of Botany, University of Hong Kong, Pokfulam Road, Hong Kong. Corresponding author. Fax: +852 2858 3477. E-mail: hcorke@yahoo.com