1. Noble Research Institute Ardmore OK 73401 USA
2. LG Chem‐FarmHannong Daejeon 34115 Korea
3. Plant Breeding and Genetics Section Cornell Univ. Ithaca NY 14853‐1902 USA
4. Texas A&M AgriLife Research Amarillo TX 79106 USA
5. Dep. of Agronomy and Horticulture Univ. of Nebraska Lincoln NE 68583‐0915 USA
6. Dep. of Soil and Crop Sciences Colorado State Univ. Fort Collins CO 80523‐1170 USA