Fig. 4.

Abundance of 50 most prominent compounds in single samples of 15 Solanum dulcamara accessions which were used in a full choice preference assay (assay 3 in Fig. 1). Accessions are arranged from least preferred (left) to most preferred (right). Unidentified compounds are indicated by a compound number, the quantified ion mass (m/z) and its retention time (sec). A selection of 13 compounds (GA1-7, X1-6) was putatively identified to have a steroidal aglycon backbone (m/z [M + H]) + glycoside or uronic acid (UrAc) conjugate and given a putative identity (ESM Table 3). The ID of compounds with significant correlations (FDR-corrected P < 0.05) with feeding preference of the grey field slug are preceded by an asterisk. Compounds were grouped in clusters based on mutual Pearson correlation (indicated and separated by red dashed lines and numbers in red on the left). The numbers of the individual S. dulcamara accessions are preceded by their population code (Fig. 1) and ordered by their rank in assay 3 (Fig. 3)