Plant Physiol.
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Plant Physiology 62:683-686 (1978)
© 1978 American Society of Plant Biologists

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Articles

Metabolism of Mevalonic Acid in Vegetative and Induced Plants of Xanthium strumarium 1

Caroline S. Bledsoe

Cleon W. Ross

College of Forest Resources, University of Washington, Seattle, Washington 98195, Department of Botany and Plant Pathology, Colorado State University, Fort Collins, Colorado 80521

The metabolism of mevalonic acid in Xanthium strumarium L. Chicago plants was studied to determine how mevalonate was metabolized and whether metabolism was related to induction of flowering. Leaves of vegetative, photoperiodically induced, and chemically inhibited cocklebur plants were supplied with [14C]mevalonic acid prior to or during a 16-hour inductive dark period. Vegetative, induced, and Tris(2-diethylaminoethyl)phosphate trihydrochloride-treated plants did not differ significantly in the amount of [14C]mevalonic acid they absorbed, nor in the distribution of radioactivity among the leaf blade (97%), petiole (2.3%), or shoot tip (0.7%). [14C]Mevalonic acid was rapidly metabolized and transported out of the leaves. Possible metabolites of mevalonate were mevalonic acid phosphates and sterols. No detectable 14C was found in gibberellins, carotenoids, or the phytol alcohol of chlorophyll. Chemically inhibited plants accumulated 14C compounds not found in vegetative or induced plants. When ethanol extracts of leaves, petioles, and buds were chromatographed, comparisons of chromatographic patterns did not show significant differences between vegetative and induced treatments.

1 This research was supported by the National Institute of Health Research Grant R01 GMO 6374-09 awarded to C. W. R.






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Copyright © 1978 by the American Society of Plant Biologists