Fig. 6

Clustering of 78 Arabidopsis accessions (1001 genomes project) based on variation of root traits measured at 19 days after germination. Plants were grown in agar-filled Petri dishes with the shoot outside the plate. Each column represents a trait; each row represents a genotype. Data of each sample were standardised in order to have zero mean and unit variance. The scaled value, denoted as the column Z-score, is plotted in red-yellow colour scale with red indicating low values and yellow indicating high values. White indicates data not available. Hierarchical clustering of traits and genotypes was based on the complete linkage hierarchical clustering method and Euclidean distance. Accessions belonging to the different clusters are marked in different colours (cluster 1–black, cluster 2–orange, cluster 3–green, cluster 4–blue, cluster 5–red, cluster 6–black, indent). The accessions described in the text are marked in bold letters