1. Institut de Biologie Moléculaire des Plantes du CNRS, 67084 Strasbourg, France;
2. Institute for Cellular and Molecular Biology Molecular, Cellular and Developmental Biology Section, University of Texas at Austin, Austin, TX 78712;
3. Department of Biochemistry, School of Life Sciences, Fudan University, Shanghai 200433, PR China;
4. INRA Colmar, UMR Vigne et Vin Alsace, Biologie du Développement de la Vigne, 68021 Colmar, France;
5. Laboratoire de Biologie Cellulaire, INRA-INAPG, 78026 Versailles, France; and
6. Laboratoire de Biologie des Semences, INRA-INAPG, 78026 Versailles, France.