Anionic peroxidase activities from poplar
(P. trichocarpa Trichobel). Extracts from root bark (1),
stem bark (2), leaf (3), root xylem (4), and stem xylem (5) were
analyzed on a native gel. Peroxidases were visualized with DAB and
H2O2 as described in Methods. The letters a through f were chosen arbitrarily to
represent the xylem gel activities. SM, Slow migrating; FM, fast
migrating. The protein migration was from − to +.