Abstract
1 INRA, UR407, Station de Pathologie Végétale, BP 94, 84143 Montfavet cedex, France
2 INRA, UR501, Laboratoire de Biologie Cellulaire, 78026 Versailles cedex, France
3 Plant Virology Group, ICGEB Biosafety Outstation, Via Piovega 23, 31056 Ca Tron di Roncade, Italy