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Plant Physiology 59:94-96 (1977)
© 1977 American Society of Plant Biologists

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Articles

Photochemical Dimerization of Ferulic Acid by Chloroplasts from Sorghum 1

Helen A. Stafford and Mark A. Brown

a Department of Biology, Reed College, Portland, Oregon 97202

Sorghum (Sorghum bicolor) chloroplasts, lamellar fragments, and Triton X-100 solubilized preparations catalyze a blue and red light-sensitized oxidation of ferulic acid to its {beta}-{beta}-linked dimer and its hydrolysis product, the acid dimer. Exogenous superoxide dismutase had no effect, and catalase and 1 to 10 mM KCN inhibited this photooxidative dimerization only in detergent-treated chloroplasts. It is postulated that the final oxidant is H2O2, formed by light-induced photosystem I electron transport, followed by an unidentified peroxidatic activity. The reaction differs, however, from that catalyzed by horseradish peroxidase in the presence of H2O2.

1 This research was supported by National Science Foundation Grant BMS 74-10360.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1977 by the American Society of Plant Biologists