1. USDA‐ARS Grain Legume Genetics and Physiology Research Unit Prosser WA 99350 USA
2. Dep. of Plant Sciences North Dakota State Univ. Fargo ND 58102 USA
3. Washington State Univ. Irrigated Agriculture Research and Extension Center Prosser WA 99350 USA
4. USDA‐ARS Sugar beet and Bean Research Unit East Lansing MI USA