摘要：The strategy of developing the viticultural sector implies the restructuring of the national nursery system, as a result of implementing the European legislation, namely by placing the premultiplic ation nucleus at the head of the viticultural channel as a guarantee of ensuring the biological traceability and retraceability of the certified propagation material. Also, in the nucleus hothouse, the ameliorator transfers the results of clone selection, sanitary and creation of new genotypes activity which can be finalized by homologation. These stipulations which should be controlled and respected during the maintenance period with a view to prevent the biological degradation and the reinfection with pa thogens of the propagating material, are obligatory during premultiplication and transfer period in the nursery
关键词：initial propagating material; premultiplication nucleus; biological category; the ameliorator's material
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