1. Dep. of Crop and Soil Sciences Washington State Univ. Pullman WA 99164 USA
2. Dep. of Plant Sciences and Plant Pathology Montana State Univ. Bozeman MT USA
3. Institute of Biological Chemistry Washington State Univ. Pullman WA 99164 USA
4. Dep. of Plant Pathology and Dep. Crop and Soil Sciences Washington State Univ. Pullman WA 99164 USA