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

Table 1 Cellular sites of CPT accumulation in cross sections (about 5 mm in length) through the midrib of a leaf

		1-month-old plantlet	2-month-old plantlet	3-month-old plantlet	3-month-old plantlet (drought-stress)	Mature plant
EIs	Tot	230 ± 9.01	223 ± 11.24	190 ± 7.03	190 ± 8.16	103 ± 4.26
	N	32.81 ± 0.22 (a)	29.20 ± 0.61 (b)	19.93 ± 0.36 (c)	21.10 ± 0.23 (c)	7.51 ± 0.39 (e)
GTs	Tot	12.31 ± 1.12	8.96 ± 1.21	6.98 ± 1.95	9.01 ± 1.43	4.12 ± 2.33
	N	3.22 ± 1.14 (a)	1.87 ± 1.05 (b)	1.26 ± 1.83 (c)	2.01 ± 1.25 (d)	0.54 ± 1.98 (e)
GICs	N	3.02 ± 1.21 (a)	2.23 ± 1.10 (b)	1.43 ± 0.82 (c)	1.17 ± 0.67 (c)	0.42 ± 0.32 (e)

(N) average number of cells or trichomes accumulating CPT per section; (Tot) average number of cells or trichomes per section. Different letters indicate statistically significant differences (P ≤ 0.05) between values. (EC) epidermal cells; (GT) glandular trichomes; (IC) idioblast cells accumulating CPT.

ISSN: 1471-2229