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Occurrence and Levels of Ecdysteroids in Spinach
Authors:
Grebenok, R. J.
Ripa, P. V.
Adler, J. H.
Published by: Lipids
Date: Aug 1991
Volume, Number, Pages: 26 8 666-668
Accession Number: ISI:A1991GB76600015
Abstract:
The dominant ecdysteroid in spinach, Spinacia oleracea L., is 20-hydroxyecdysone (2-beta,3-beta,14-alpha,20R,22R,25-hexahydroxy-5-beta-cholest-7-en-6-one ) with the presence of a smaller amount of polypodine B (2-beta,3-beta,5-beta,14-alpha,20R,22R,25-hepta-hydroxycholest-7-en-6-on e). Ecdysteroids are present in the seed embryo at 14-mu-g ecdysteroid/seed, and ecdysteroid levels increase in the plant during growth and development. During the onset of ecdysteroid production, the ratio of ecdysteroid to total sterol shifts from a value of one to about ten over the course of a week. Spinach may serve as a model to study ecdysteroid biosynthesis in plants.
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