Plant Physiol. Drug Metab Dispos
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Plant Physiology 55:791-795 (1975)
© 1975 American Society of Plant Biologists

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Articles

Regulation of Chlorophyll Synthesis in the Green Alga Golenkinia

Richard Ellis, Ted Spooner and Robert Yakulis

1 Department of Biology, Bucknell University, Lewisburg, Pennsylvania 17837

Chlorophyll synthesis in Golenkinia is inhibited 10-fold by growth in darkness on acetate or by growth on elevated concentrations of acetate in the light, particularly if the growth medium contains low levels of nitrogen. Glucose has no such inhibitory effect. {delta}-Aminolevulinic acid, with a maximal effect at 0.01 M, but not its precursors, overrides the inhibitory effect of acetate and darkness, restoring chlorophyll synthesis. Glycine, succinate, and {alpha}-ketoglutarate, the precursors tested, all enter the cell. Cells forming chlorophyll produce significantly more aminolevulinic acid than do cells becoming bleached, further indicating the important regulatory role of this compound. Cyclic AMP has no effect on chlorophyll synthesis. These results are compared with those obtained studying other algae, and a mechanism relating light and acetate to chlorophyll formation is proposed.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1975 by the American Society of Plant Biologists