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. 1970 Aug;46(2):240–246. doi: 10.1104/pp.46.2.240

Controls on Chlorophyll Synthesis in Barley 1

Kenneth Nadler 1,2, S Granick 1
PMCID: PMC396571  PMID: 16657443

Abstract

In 7- to 10-day-old leaves of etiolated barley (Hordeum vulgare), all of the enzymes that convert δ-aminolevulinic acid to chlorophyll are nonlimiting during the first 6 to 12 hours of illumination, even in the presence of inhibitors of protein synthesis. The limiting activity for chlorophyll synthesis appears to be a protein (or proteins) related to the synthesis of δ-aminolevulinic acid, presumably δ-aminolevulinic acid synthetase. Protein synthesis in both the cytosol and plastids may be required to produce nonlimiting amounts of δ-aminolevulinic acid. The half-life of a limiting protein controlling the synthesis of δ-aminolevulinic acid appears to be about 1½ hours, when determined with inhibitors of protein synthesis. Acceleration of chlorophyll synthesis by light is not inhibited by inhibitors of nucleic acid synthesis, but is inhibited by inhibitors of protein synthesis. A model for control of chlorophyll synthesis is proposed, based on a light-induced activation at the translational level of the synthesis of proteins forming δ-aminolevulinic acid, as well as the short half-life of these proteins. Evidence is presented confirming the idea that the holochrome on which protochlorophyllide is photoreduced to chlorophyllide functions enzymatically.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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