Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 44:78-84 (1969)
© 1969 American Society of Plant Biologists

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Phorbic Acid Biosynthesis in the Latex Vessel System of Euphorbia

Arnold Nordal1 and A. A. Benson

a Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92037

Evidence is presented that phorbic acid is formed in the latex producing cell system, rather than in photosynthetic or chlorophyll-free tissues of Euphorbia resinifera Berg. When a branch of the plant was kept first in a 14CO2 atmosphere with 12 hr light-dark periods for 2 days and then left under natural conditions in the air outside for at least 2 to 3 days, radioactive phorbic acid was found in the latex. Phorbic acid synthesis appeared to be independent of the photosynthetic and respiratory activities of the plant.

Besides phorbic acid 2 other major radioactive compounds were recognized in the latex, a glycoside or oligosaccharide, and a lipid belonging to the group of triterpenoid compounds characteristic of the latex in several species of Euphorbia.

1 Present address: Institute of Pharmacy, University of Oslo, Oslo 3, Norway.






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Copyright © 1969 by the American Society of Plant Biologists