Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 69:112-116 (1982)
© 1982 American Society of Plant Biologists

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Articles

Effects of Iron and Oxygen on Chlorophyll Biosynthesis 1

II. OBSERVATIONS ON THE BIOSYNTHETIC PATHWAY IN ISOLATED ETIOCHLOROPLASTS

Barbara M. Chereskin and Paul A. Castelfranco2

Department of Botany, University of California, Davis, California 95616

The conversion of L-glutamate to {delta}-aminolevulinate, in preparations of cucumber etiochloroplasts incubated in vitro, was inhibited by protoheme IX and Mg-protoporphyrin IX. Mg-protoporphyrin IX was destroyed in the presence of air and plastids; this breakdown was accelerated by S-adenosyl methionine. Mg-protoporphyrin IX was also converted to protochlorophyllide in vitro. This conversion exhibited an absolute requirement for atmospheric oxygen and was strongly stimulated by S-adenosyl methionine and by darkness.

Based on these results, and on the results of the preceding paper (Spiller, Castelfranco, Castelfranco 1981 Plant Physiol 68: 107-111), a comprehensive hypothesis for the role of O2 and Fe in chlorophyll biosynthesis is formulated.

2 To whom reprint requests should be addressed.

1 Supported by National Science Foundation Grant PCM 7813250.






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Copyright © 1982 by the American Society of Plant Biologists