1. Department of Horticulture and Genome Center of Wisconsin (M.C.S.-R., S.-H.S., P.J.J., P.J.K.) and Department of Plant Pathology (L.A.-P., A.F.B.), University of Wisconsin, Madison, Wisconsin 53706; and Department of Biochemistry, University of Missouri, Columbia, Missouri 65211 (Y.L., H.W., S.Z.)