1. Laboratoire de Biologie Moléculaire des Relations Plantes-Microorganismes, Centre National de la Recherche Scientifique–Institut National de la Recherche Agronomique (INRA-CNRS) UMR215, BP27, 31326 Castanet-Tolosan Cedex, France
2. Department of Plant Pathology and Microbiology, Crop Biotechnology Center, Texas A & M University, College Station, Texas 77843