1. Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Versailles 78026, France (S.D., F.V., J.-C.P., C.K.);
2. University of Arizona, Department of Plant Sciences, Tucson, Arizona 85721 (A.M.C., Y.Z., G.A.T.); and
3. Department of Applied Science University of Arkansas, Little Rock, Arkansas 72204 (G.A.T.)