Institution: | Molecular and Cellular Biology Program,1. Department of Botany and Plant Pathology,2. and Department of Microbiology,4. Oregon State University, Corvallis, Oregon 97331; Institut National de la Recherche Agronomique, Station de Pathologie Vegetale, Centre de Recherche de Rennes, 35653 Le Rheu Cedex, France3.; and Agricultural Research Service, U.S. Department of Agriculture, Corvallis, Oregon 973305. |