Figure 4.

Heatmap of the rank per strain in media amended with metals (pH 4.3) or at pH 2 without metal, shown as a representation of the sequencing data versus the responses of the isolates to the growth stress applied. The relationships between the isolates, according to ITS sequencing, are pictured as a dendrogram. Site of origin of isolates is indicated into parentheses (see Table 1 for site details). Strains not forming endophytic structures in the inoculation trial are marked with an asterisk (*). The heatmap was drawn using complete-linkage clustering and the Manhattan metric to calculate distances. Detailed figures can be found in supplemental material.