**Acknowledgement**

We thanks Veronica Vizzarri, Tiziana Belfiore, Maria Elena Noce, Luigi Perri and all the other colleagues involved in field and laboratory works and that allow us to write this contribute. Financial support was provided by the Italian Ministry of Agriculture, Food and Forestry Policy through the project GERMOLI "Salvaguardia e valorizzazione del GERMoplasma OLIvicolo delle collezioni del CRA-OLI"
