Fig 1.
Transmission electron micrographs (TEM) of cell ultrastructure in roots of I. sinensis.
Large vacuole, elonged mitochondrion and distinct nucleus in control samples (a, b). Little changes of shape of mitochondrion (c,d), nucleoplasm (c), cell wall (d) and small vacuole (d) in Pb treated samples. Bars = 1 μm. V-vacuole; Mi-mitochondrion; CW-cell wall; N-nucleus; PM-plasma membrane; NP-nucleoplasm.
Fig 2.
Transmission electron micrographs (TEM) of cell ultrastructure in upper leaves of I. sinensis.
Spindle-shape chloroplast with many starch grains and integrated lamella in control samples (a). Swollen (b) and normal (c) chloroplast, various shapes of mitochondria (c, d) in Pb treated samples. Bars = 1 μm. Mi-mitochondrion; Ch-chloroplast; CW-cell wall; S-starch grain; OG-osmiophilic globule (plastoglobuli); PM-plasma membrane.
Fig 3.
Transmission electron micrographs (TEM) of cell ultrastructure in lower leaves of I. sinensis.
Smooth cell wall and unchanged mitochondria in control samples (a). A slight damaged chloroplast with loosely arranged lamella and many plastoglobuli (b), serious damaged mitochondria (c) and disrupted plasma membrane (f) and deposited Pb particles on cell wall (e, f) in Pb treated samples. Bars = 500 nm. Mi-mitochondrion; Ch-chloroplast; CW-cell wall; S-starch grain; OG-osmiophilic globule (plastoglobuli); PM-plasma membrane.