Rescue, characterization and identification of endangered grape cultivars from the Tortonese area (South-Eastern Piedmont, Italy) [Vitis vinifera L.]

agronomic characters biodiversidad biodiversity biodiversità brotes caratteri agronomici collection botanique collezioni botaniche feuille foglie germogli germoplasma germplasm heat therapy hojas identification identificazione in vitro regeneration land varieties leaves piamonte piedmont piemont piemonte plant collections pousse procedencia provenance provenienza geografica rigenerazione in vitro scaphoideus titanus shoots termoterapia thermotherapie varietà indigene vitis vinifera