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. 2020 May 15;15(5):e0233055. doi: 10.1371/journal.pone.0233055

Fig 1. Accumulation of As in fronds of the As-hyperaccumulator ferns P. cretica var.

Fig 1

Albo-lineata (a) and P. cretica var. Parkerii (b) and the As-non-hyperaccumulator fern P. straminea (c). Values are mean ± standard error (SE). Data with the same letter are not significantly different. Different letters indicate significant differences (p < 0.05) among variants of each fern (lower-case letters) and among the individual ferns of each variant (upper-case letters) according to the Kruskal-Wallis test. Treatment abbreviations: control– 0 mg As·kg-1 soil; As1–20 mg As·kg-1 soil; As2–100 mg As·kg-1 soil. The background soil As content is 16 mg As·kg-1 soil. The difference between control and individual As treatments is the spiked As dose plus the 20% As extraction efficiency.