Figure 4.

Principal components 1 and 2 for collected and developed P. sativum accessions in the PSPPC mini-core. The structure of the plot resembles the PCA of the full collection (Figure 3a), indicating robust representation of genetic groups in the PSPPC mini-core. Peas from subspecies P. sativum subsp. elatius (light green) and the P. sativum—Central Asia genetic group (dark blue) are distinct from cultivated germplasm. Most of the peas that form a gradient between the P. sativum—Primary and P. sativum—Central Asia genetic groups are from Asia outside of the Mediterranean region (red). The accessions from the ‘DA’ (Diversity Analysis) refer to P. sativum accessions in either of the two groups defined by Cheng et al.²⁴ and Kwon et al.²⁵ and used to find unique alleles compared with breeding germplasm.^24,25