Figure 5

Sections from a pea petiole (a), wheat leaf (b), and pea (c), sunflower (d) and tomato (e) roots.

a) Detail of a cross section of a petiole from the first internode of pea after 24 h of exposure to bioferrofluid. Arrows indicate accumulation of nanoparticles in vascular tissues. b) Detail of a longitudinal view of wheat leaf showing accumulation of bioferrofluid in trichomes. c) Detail of a longitudinal section of a root of pea not immersed into the bioferrofluid and after 48 h of exposure to bioferrofluid of opposite roots. Arrows indicate accumulation of nanoparticles in vascular tissues. d) Idem in sunflower. e) Idem in tomato. *, xylem containing ferrofluid; #, parenchimatic cell containing ferrofluid; p, parenchimatic cells; x, xylem vessels. Scale bars represent 100 μm, except in d) whereas it represents 50 μm.