Abstract
Mercuric chloride and methyl mercuric chloride inhibited the biosynthesis of lipids, especially galactolipids and chlorophylls in photosynthetically grown freshwater algae, Ankistrodesmus braunii and Euglena gracilis. Three and one-half parts per million of mercuric chloride gave 50% inhibition of galactolipid biosynthesis, 98% inhibition of chlorophyll synthesis in A. braunii, and a slightly smaller degree of inhibition in E. gracilis. Also, 2 ppm of methyl mercuric chloride caused 85% inhibition of galactolipid biosynthesis and 98% inhibition of chlorophyll biosynthesis in A. braunii. Both mercuric chloride and methyl mercuric chloride strongly inhibited the galactosyl transferase activity for the galactolipid biosynthesis in the chloroplasts isolated from Euglena cells and spinach leaves. 12 references, 2 figures, 2 tables.
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