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The fast chlorophyll a fluorescence transient (a, b) and structural and functional parameters of photosystem II (c, d) of kidney vetch leaves depending on Pb concentration in the medium after 4 (a, c) and 8 (b, d) weeks of culture. ru, relative units; all the values in c and d were expressed relative to the control (set as 1); abbreviations—see Table 1; up and down arrows, statistically significant increase or decrease within each parameter in relation to control at p ≤ 0.05, n = 12
