Identification of two chromone phytoalexins in the sweet pea, Lathyrus odoratus
作者:David J. Robeson、John L. Ingham、Jeffrey B. Harborne
DOI:10.1016/s0031-9422(00)82217-7
日期:1980.1
Abstract A major phytoalexin isolated from the Helminthosporium Carbonum -inoculated leaflets and pods of Lathyrusodoratus has been identified by spectroscopic procedures as 5,7-dihydroxy-3-ethylchromone (lathodoratin). Small amounts of the corresponding 7- O -methyl ether (methyl-lathodoratin) are also formed by this plant. Both compounds similarly occur as phytoalexins in the closely related legume
Biosynthesis of the 3-ethylchromone phytoalexin lathodoratin in Lathyrus odoratus
作者:Nidhal A. Al-Douri、Paul M. Dewick
DOI:10.1016/0031-9422(88)84092-5
日期:1988.1
of the 3-ethylchromonephytoalexinlathodoratin from cupric sulphate-induced pods of sweet pea (Lathyrusodoratus) has a polyketide origin. The remaining five carbon ‘isoprene unit’ is derived from the amino acid isoleucine which provides the starter unit, probably 2-methylbutanoate, for acetate-malonate chain extension. The pterocarpan phytoalexin pisatin is produced along with lathodoratin, and precursors
Chromone glucosides, takanechromones A-C (1, 2 and S) and chromanone glucosides, named takanechromanones A and B (3 and 4), were isolated from the methanolic extracts of Hypericum sikokumontanum together with 27 known compounds. Their structures were established based on spectroscopic evidence. The isolated compounds and some chromone derivatives were assayed for antimicrobial activity against Helicobacter pylori and cytotoxicity against human cancer cell lines. (C) 2008 Elsevier Ltd. All rights reserved.