Figure 5.

Protoberberine Alkaloids Accumulate in the Mature Endodermis of Roots, and in the Pith and Cortex of Rhizomes, in T. flavum.

(A) to (D) Accumulation of protoberberine alkaloids in a fresh whole root (A) shown by light microscopy and in 0.5-mm cross sections of fresh roots at various stages of development ([B] to [D]) revealed by epifluorescence microscopy.

(E) and (F) Accumulation of protoberberine alkaloids in fresh longitudinal sections (E) and cross sections (F) of a rhizome shown by light microscopy.

ap, apical meristem; co, cortex; en, endodermis; ep, epidermis; ex, exodermis; pe, petiole; pi, pith; ro, root; va, vascular tissue. Bars = 500 μm in (A), 40 μm in (B) to (D), and 500 μm in (E) and (F).