Seed oil and protein % are negatively correlated. Graph shows the average seed oil and protein content (% of dry seed weight) of 208 Arabidopsis genotypes including RIL from 3 populations and a core-collection of 48 accessions (3 replicates/genotype). All genotypes were grown in one experiment. The black line corresponds to the protein/oil (P/O) regression line. The focus on some remarkable genotypes, corresponding to the highlighted points of different colours, is discussed in the text.