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. 2023 Sep 7;136(6):931–945. doi: 10.1007/s10265-023-01493-1

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© The Author(s) 2023

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Fig. 4 — The total phenolic contents in shoots (a) and roots (b), the polyphenol oxidase activity (PPO) in shoots (c) and roots (d) and the malondialdehyde (MDA) content in shoots (e) and roots (f) of P. sativum 3 weeks after Si-supplementation (1 mM Na₂SiO₃ or 2 mM Na₂SiO₃) and/or Cd-treatment (50 µM CdSO₄) (n = 4). Each value is the means of four replicates ± SD. Different letters represent significant differences (p ≤ 0.01)