Fig 5. Distribution of chloroplasts in mesophyll cells of Lemna trisulca in white light.

Control plants (A, B, E, F, I, J) and plants treated with lead (15 μM Pb²⁺; C, D, G, H, K, L) for 24 h in darkness (A-D), followed 1 h by weak white light (E-H; 50 μE m^-2s^-1) or strong white light (I-L; 1000 μEm^-2s^-1). Other explanations as in Fig. 2 and S1 Fig. Scale bar = 20 μm.