Symbiotic phenotypes of each S. meliloti and S. medicae strain with M. truncatula. Dendrogram and heatmap showing the results of clustering analysis based on the phenotype values. Averaged raw values of each phenotype from three biological replicates were normalized to the range 0 to 1 in each M. truncatula genotype. The normalized values were then averaged for 27 genotypes of M. truncatula, and clustered. The color in the heatmap indicates the level of value; red indicates the highest and green indicates the lowest value. Black colored names indicate S. meliloti strain, and red colored names indicate S. medicae strain. PC, phenotype cluster.