Author details

reason, they recommend using at least 19 markers (among the 38 markers employed in their work). In general, for the selection of the panel of SSR markers, the following criteria should be followed. Based on previous works, the SSR marker loci with the highest number of marker alleles and the highest PIC and PD scores should have the priority. In addition, the position of the SSR markers across the genome, as mapped in different linkage groups and associated with adjacent chromosome blocks, is crucial in order to get a representative multilocus marker genotype. In fact, microsatellites retrieved from noncoding regions (genomic SSR markers) meet this requirement more precisely than those derived from expressed regions (EST-SSR markers). Nevertheless, the application of EST-SSR markers cannot be excluded when phylogenetic relationships have to be investigated. It is well known that SSR markers belonging to coding regions may be functionally more informative than those

from Cipriani et al. [74].

146 Rediscovery of Landraces as a Resource for the Future

Figure 1. Schematic representation of the 19 basic linkage groups of Vitis vinifera L. with indication of the 38 mapped marker loci chosen on the basis of their discriminant informativeness. In addition to the marker name, each locus reports the individual power of discrimination value (PD) and the polymorphism information content (PIC). Figure modified

Fabio Palumbo and Gianni Barcaccia\*

\*Address all correspondence to: gianni.barcaccia@unipd.it

Laboratory of Genomics and Plant Breeding, DAFNAE – University of Padua, Campus of Agripolis, Legnaro, Italy
