Sterol conjugates of two phenotypically different calli of Beta vulgaris |
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Authors: | Perry V Ripa John H Adler |
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Institution: | (1) Department of Biological Sciences, Michigan Technological University, 49931 Houghton, MI, USA |
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Abstract: | Steryl glycosides are the predominant form of sterol at 88% of the total sterol in non-betalain producing calli of Beta vulgaris. The total sterol decreases and sterol form shifts from steryl glycosides to 97% free sterol upon the transition of non-betalain to betalain producing calli. A substantial decrease in stigmasterol (24 --ethylcholesta-5,22E-dien-3 -ol) and sitosterol (24 -ethylcholest-5-en-3 -ol) levels is observed during this transition, and alters the ratio of 7: 5 sterols. Spinasterol (24 - ethyl-5 -cholesta-7,22E-dien-3 -ol) is the dominant sterol at 43% and 95% of the total sterol in non-betalain producing and betalain producing calli. The level of 22-dihydrospinasterol (24 -ethyl-5 -cholest-7-en-3 -ol) is reduced in both calli to 3% from 25% in leaves. Lanosterol (4,4,14 -trimethyl-cholesta-8(9),24-dien-3 -ol) and cycloartenol (9 ,19-cyclopropyl-4,4,14 -trimethyl-cholest-24-en-3 -ol) were identified in betalain and nonbetalain producing callus respectively. |
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