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Figure 3 | BMC Plant Biology

Figure 3

From: Cell-specific expression of tryptophan decarboxylase and 10-hydroxygeraniol oxidoreductase, key genes involved in camptothecin biosynthesis in Camptotheca acuminata Decne (Nyssaceae)

Figure 3

Optical micrographs of fresh leaf cross sections of Camptotheca acuminata 3-month-old plantlets observed under UV-light. (A) Epidermal cells accumulating CPT (arrows) localized on the abaxial side of the leaf midrib; (B) accumulation of CPT in a glandular trichome (white arrow) and in some epidermal cells (yellow arrows) surrounding it; (C) group of segregator idioblasts (white arrow) containing CPT crystals localized in the leaf mesophyll, at midrib level; in the section, glandular trichomes (light-blue arrows) and non-glandular trichomes (yellow arrows) can be observed; (D) CPT accumulation in a group of segregator idioblasts localized in the spongy parenchyma adjacent to the abaxial epidermis. Abaxial Epidermis (AbE); Adaxial Epidermis (AdE); Palisade Parenchyma (PP); Spongy Parenchyma (SP). (A) bar = 5 μm; (B, C) bar = 10 μm; (D) bar = 50 μm.

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