Laticifers in Camptotheca acuminata Decne: distribution and structure.

In this paper, a system of laticifers in Camptotheca acuminata Decne (Nyssaceae) is described. Laticifers were already present in the leaf primordia of the shoot apex. In the mature leaves, laticifers were found in the midrib and in the larger veins, both in the parenchymatic region delimited by vascular bundles and in the cortex just external to the phloem.

The effect of growth regulators and sucrose on anthocyanin production in Camptotheca acuminata cell cultures.

The effect of different concentrations of growth regulators and sucrose on anthocyanin production in cell suspension cultures of Camptotheca acuminata Decaisne (Nyssaceae) was described for the first time and qualitatively and quantitatively evaluated. Anthocyanin production was significantly greater in the presence of kinetin, compared to benzyladenine, with the greatest concentration observed in the presence of 2 microM kinetin. No significant differences in anthocyanin production were observed when comparing 2,4-dichlorophenoxyacetic acid to alpha-naphthaleneacetic acid, except when using 2 microM, 2,4-dichlorophenoxyacetic acid, which resulted in greater anthocyanin production.

Xanthones from calli of Hypericum perforatum subsp. perforatum.

Two new xanthone derivatives, 1-hydroxy-5,6,7-trimethoxyxanthone and 3-O-methylpaxanthone were isolated from callus of Hypericum perforatum subsp. perforatum together with the known paxanthone, cadensin G, 1-hydroxy-6,7-dimethoxyxanthone, 1,3,6,7-tetrahydroxyxanthone, and 1,3,5,6-tetrahydroxyxanthone. The structures of the new compounds were established by spectroscopic methods.

Abietane diterpenoids from callus cultures of Taxus baccata.

A new compound was isolated from calli of Taxus baccata L. and assigned the structure 3beta,11-dihydroxy-12-methoxyabieta-8,11,13-triene-7-one. Two other metabolites were identified as 3-oxocryptojaponol and taxamairein C, both previously isolated from Taxus mairei.