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Plant Physiology 53:304-306 (1974)
© 1974 American Society of Plant Biologists

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Articles

Inhibition of Photophosphorylation by Kaempferol 1

Charles J. Arntzen, Scott V. Falkenthal2 and Sandra Bobick3

a Department of Botany, University of Illinois, Urbana, Illinois 61801

Kaempferol, a naturally occurring flavonol, inhibited coupled electron transport and both cyclic and noncyclic photophosphorylation in isolated pea (Pisum sativum) chloroplasts. Over a concentration range which gave marked inhibition of ATP synthesis, there was no effect on basal or uncoupled electron flow or light-induced proton accumulation by isolated thylakoids. It is suggested that kaempferol acts as an energy transfer inhibitor.

2 Participant in Honors Biology Program, School of Life Sciences, University of Illinois.

3 Present address: Biochemical Pharmacology, Division of Biological and Medical Sciences, Brown University, Providence, R. I. 02912.

1 This work was supported in part by funds from the Illinois Agricultural Experiment Station.






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Copyright © 1974 by the American Society of Plant Biologists