Figure 4.

Leaf anatomy and chloroplasts ultrastructure of Ceylon leadwort (P. zeylanica) after 4 weeks of culture on the media with different Pb concentration; (a) anatomy of leaf from control medium; (b) mesophyll cell of leaf from control medium; c) ultrastructure of chloroplasts from control medium d) ultrastructure of chloroplasts from medium with 0.05 g Pb∙l⁻¹; (e) anatomy of leaf from medium with 0.1 g Pb∙l⁻¹; (f) mesophyll cell of leaf from medium with 0.1 g Pb∙l⁻¹; (g) and h) ultrastructure of chloroplasts from medium with 0.1 g Pb∙l⁻¹. Abbreviations: ue—upper epidermis, le—lower epidermis, pp—palisade parenchyma, sp—spongy parenchyma, ps—parenchyma sheath, vb—vascular bundle, ch—chloroplast, mt—mitochondrion, v—vacuole, cw—cell wall, s—stroma, ss—swollen stroma, g—grana, lt—loose thylakoids, pl—plastoglobule. Scale bars, 50 µm (a,e), 5 µm (b,f), 1 µm (c,d,g,h).