title: Phytoecdysteroids in seeds and plants of Rhagodia baccata (Labill.) Moq. (Chenopodiaceae).
abstract: Seeds of Rhagodia baccata afforded, in addition to 20-hydroxy-ecdysone and polypodine B, a novel phytoecdysteroid, (20R)-22-deoxy-20,21-dihydroxyecdysone, the structure of which was elucidated unequivocally by UV, LSIMS and NMR techniques. This compound possessed agonistic activity in the Drosophila melanogaster BII cell bioassay, with an ED50 value of 2.0 x 10(-7)M (ED50 value for 20-hydroxyecdysone = 7.5 x 10(-9)M). The distribution of ecdysteroids in plants of R. baccata has been determined. Highest levels are associated with the youngest aerial tissues and with the roots. Ecdysteroid profiles are qualitatively very similar throughout the plant, with 20-hydroxyecdysone and polypodine B predominating in all plant parts tested.
authors.affiliation: Department of Biological Sciences, University of Exeter, Hatherly Laboratories, Devon, U.K. L.N.Dinan@exeter.ac.uk
authors.forename: L
authors.initials: L
authors.lastname: Dinan
authors.forename: S D
authors.initials: SD
authors.lastname: Sarker
authors.forename: P
authors.initials: P
authors.lastname: Bourne
authors.forename: P
authors.initials: P
authors.lastname: Whiting
authors.forename: V
authors.initials: V
authors.lastname: Sik
authors.forename: H H
authors.initials: HH
authors.lastname: Rees
mesh_terms: D000818:Animals; D019663:Chenopodiaceae / Q000737:chemistry*; D004440:Ecdysone / Q000031:analogs & derivatives*; D026461:Ecdysteroids; D010936:Plant Extracts; D012639:Seeds; D013256:Steroids / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism
chemical_list: C119868:22-deoxy-20,21-dihydroxyecdysone; D026461:Ecdysteroids; D010936:Plant Extracts; D013256:Steroids; D004440:Ecdysone