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. 2019 Nov 12;10:2591. doi: 10.3389/fmicb.2019.02591

FIGURE 4.

FIGURE 4

Relative changes in root morphology of Robinia pseudoacacia grown with or without Funneliformis mosseae and subjected to different Pb levels for 4 months. (A) Root length. (B) Root surface area. (C) Root volume. (D) Number of root tips. (E) Average root diameter. (F) Number of root forks. Shown are means ± SD (n = 3). Asterisks indicate significant differences between inoculated and non-inoculated seedlings within each Pb treatment (P < 0.05, ∗∗P < 0.01; t-test). Different lowercase letters indicate significant differences among different Pb levels within inoculated or non-inoculated treatment (P < 0.05; ANOVA with post hoc Duncan).