Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 51:110-114 (1973)
© 1973 American Society of Plant Biologists

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Articles

Effect of Light on Mevalonic Acid Incorporation into the Phytosterols of Nicotiana tabacum L. Seedlings 1,2

Parshall B. Bush3 and C. Grunwald

a Department of Agronomy, University of Kentucky, Lexington, Kentucky 40506

Mevalonic acid-2-14C was readily incorporated into the free, esterified, and glycosidic sterol fractions of tobacco (Nicotiana tabacum L. var. Burley 21) seedlings. The time course of mevalonic acid-2-14C incorporation was different for the various individual sterols. Campesterol and sitosterol (group I) became radioactive as the free sterol and subsequently as the steryl ester. The reverse order was observed for cholesterol and stigmasterol (group II). Light stimulated the incorporation of mevalonic acid-2-14C into the group I free sterols and during the first 6 to 9 hours into the steryl esters of group II. The increase in specific radioactivity of the group II steryl esters was followed by a decline. Based on time course studies it is suggested that the group II steryl esters turn over rapidly and that light influences the rate of turnover.

3 Present address: Soil Testing and Plant Analysis Laboratory, University of Georgia, Athens, Ga. 30601.

1 This research was supported in part by University of Kentucky Research Foundation Grant 7000166 and Crops Research Division, Agricultural Research Service, United States Department of Agriculture Contract 12-14-100-9559(34). This paper (No. 72-6-3-85) is part of a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.

2 Part of Ph.D. thesis of P. B. Bush.






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