1. The International Maize and Wheat Improvement Center (CIMMYT, Int).; Apdo. Postal 6-641 06600 Mexico D.F. Mexico
2. Institute of Plant Breeding, Seed Science and Population Genetics; Univ. of Hohenheim; 70593 Stuttgart Germany
3. Crop Science Dep., 101 Turner Hall; Univ. of Illinois; 1102 S. Goodwin Urbana IL 61801
4. Institute of Crop Breeding and Cultivation, Chinese Academy of Agricultural Sciences; Zhongguancun South Street 12 100081 Beijing China
5. Facultad de Agronomía; Universidad de la República; Av. Garzón 780 Montevideo 12900 CP Uruguay
6. International Crops Research Institute for the Semi-arid Tropics; Patancheru, Hyderabad 502-324 Andhra Pradesh India