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Plant Physiology 88:1403-1406 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Effect of Light on Sterol Changes in Medicago sativa

Li-Shar Huang and Claus Grunwald

Illinois Natural History Survey and Department of Plant Biology, University of Illinois, 172 National Resources Building, MC-652, 607 East Peabody Drive, Champaign, Illinois 61820-6970

Most vascular plants contain {Delta}5-sterols as the predominant type; however, a few species such as Medicago sativa, have mainly {Delta}7-sterols. The {Delta}7-sterols of alfalfa are isomers of the common {Delta}5-sterols and are generally assumed to be their immediate precursors. Light had a significant influence on the sterol status of M. sativa. High light intensity and a long day favored the accumulation of dihydrospinasterol; a short day and low light intensity, particularly darkness, favored spinasterol accumulation. These data for {Delta}7-sterol plants agree with those reported for {Delta}5-sterol plants; light favors the accumulation of the monounsaturated 29 carbon sterols and darkness favors the accumulation of the diunsaturated sterols. Proposed is a mechanism to explain the effect of light on the accumulation of {Delta}7- and {Delta}5-sterols.




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Copyright © 1988 by the American Society of Plant Biologists