1. School of Integrative Plant Science, Soil and Crop Sciences Section Cornell Univ. Ithaca NY 14853‐1901 USA
2. Research Center for Global Agromedicine Obihiro Univ. of Agriculture and Veterinary Medicine Obihiro Hokkaido 080‐8555 Japan
3. International Maize and Wheat Improvement Center (CIMMYT) Patna Bihar 800025 India
4. Centre for Sustainable Agricultural Systems Univ. of Southern Queensland Toowoomba QLD 4300 Australia