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. 2020 Jun 29;20:296. doi: 10.1186/s12870-020-02500-6

Fig. 3.

Fig. 3

Analysis of PI fluorescence density detected by Image J at longitudinal sections of roots exposed to 1, 10, 50, or 100 μmol/L Pb for 3, 6, 12, and 24 h. Vertical bars denote the SE. Different letters indicate significant differences (p < 0.05)