Figure 2 .

Tolerance indices (%) based on relative root length of different populations ofRumex acetosa andCommelina communis under four Cu treatments in hydroculture (0.25, 40, 160, and 320 μmol L-1CuSO4, respectively; M: metallicolous; NM: non-metallicolous). Different letters on the error bars indicate a significant difference at P  < 0.05 (LSD test) under the same treatment.

Ye et al. BMC Evolutionary Biology 2012 12:84   doi:10.1186/1471-2148-12-84
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