Fig. 7
Peroxidase activity in H15 and H20. a to d, H15; E to H, H20. Details of the bast fibres and xylem regions are shown in b and f and d and h, respectively. Blue arrows indicate peroxidase activity in the middle lamella and cell corners of the bast fibres; blue arrowheads indicate peroxidase activity in the xylem vessels and fibres. i: negative control without DAB in H20. j: negative control with salicylhydroxamic acid as inhibitor of peroxidase activity in H20. bf1 primary bast fibre, bf2 secondary bast fibre, c cambial zone, xf xylem fibre, xv xylem vessel. Scale bar: 100 μm (g, i, j), 50 μm (a, c, e); 25 μm (d, f, h); 10 μm (b)