The characterisation of patterns of genetic diversity within species, and among populations, is a fundamental necessity to establish any program aimed at preservation of biodiversity. Genetic markers are basic for supplying information on the genetic structure of populations, to analyse the pattern of within-species variability distribution [4] and to support the management of seed supply [5]. In particular, knowledge of genetic variation should be the basis for actions of ecological restoration [6]. This is even more important where the preservation of local, marginal and probably well adapted and/or differentiated gene pools must be achieved, through the management of small, marginal and inbreed populations [7], [8]. As a consequence, the goal is to focus not only on scattered and rare species, but also on those characterised by wide distribution that could appear to be less sensitive to genetic erosion [9].