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Plant Physiology 69:421-423 (1982)
© 1982 American Society of Plant Biologists

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Articles

Separation of Mg-Protoporphyrin IX and Mg-Protoporphyrin IX Monomethyl Ester Synthesized de novo by Developing Cucumber Etioplasts 1

Thomas P. Fuesler, Claire M. Hanamoto and Paul A. Castelfranco2

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

High pressure liquid chromatography was used to demonstrate that chelation of Mg2+ into protoporphyrin IX precedes methylation in isolated greening etioplasts from cucumber (Cucumis sativus L. var. Beit Alpha) cotyledons. Mg-protoporphyrin IX synthesized in vitro from protoporphyrin IX, Mg2+, and ATP or exogenous Mg-protoporphyrin IX could serve as substrates for the methylation step. In either case, S-adenosylmethionine was the methyl donor and could not be replaced by ATP plus methionine.

2 To whom correspondence should be addressed.

1 Supported by National Science Foundation Grant PCM-78 13250.






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Copyright © 1982 by the American Society of Plant Biologists