Figure 1.

Use of the different types of markers for olive diversity studies during the last 20 years, based on the number of published papers using Scopus-indexed journal: SSR markers, the combined use of SSR–SNP markers and SNP markers. We can observe that the use of SSR for the cultivar identification increased by 2002 and it still is the most used, whereas the use of novel technologies and SNP markers is growing by 2017. By 2018, the combined use of SSR and SNP markers showed a powerful synergy in discriminating among highly similar cultivars, in resolving synonymies and homonymies and allowing a better cultivar identification, particularly in juvenile stages.