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. 2021 Mar 14;28(28):37616–37626. doi: 10.1007/s11356-021-13242-9

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© The Author(s) 2021

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Fig. 5 — Quantum yield of PSII electron transport (ΦPSII) (a), electron transport rate (ETR) (b) nonphotochemical quenching (NPQ) (c), PSII maximum quantum yield (F_v/F_m), measured on control (C), Cd-treated, and Pb-treated Sardo, Siciliano, and Spagnolo cultivar. Data are the mean±SD, n=5. Different letters indicate significant differences among the treatments, according to Tukey’s post hoc test (p<0.05)