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PMID: 9490750 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Etioplast differentiation in arabidopsis: both PORA and PORB restore the prolamellar body and photoactive protochlorophyllide-F655 to the cop1 photomorphogenic mutant.

The Plant cell ·Vol. 10 ·No. 2 ·1998-02-00 ·Pages 283-96

Sperling U, Franck F, van Cleve B, Frick G, Apel K, Armstrong GA

Abstract

The etioplast plastid type of dark-grown angiosperms is defined by the accumulation of the chlorophyll (Chl) precursor protochlorophyllide (Pchlide) and the presence of the paracrystalline prolamellar body (PLB) membrane. Both features correlate with the presence of NADPH:Pchlide oxidoreductase (POR), a light-dependent enzyme that reduces photoactive Pchlide-F655 to chlorophyllide and plays a key role in chloroplast differentiation during greening. Two differentially expressed and regulated POR enzymes, PORA and PORB, have recently been discovered in angiosperms. To investigate the hypothesis that etioplast differentiation requires PORA, we have constitutively overexpressed PORA and PORB in the Arabidopsis wild type and in the constitutive photomorphogenic cop1-18 (previously det340) mutant, which is deficient in the PLB and Pchlide-F655. In both genetic backgrounds, POR overexpression increased PLB size, the ratio of Pchlide-F655 to nonphotoactive Pchl[ide]-F632, and the amount of Pchlide-F655. Dramatically, restoration of either PORA or PORB to the cop1 mutant led to the formation of etioplasts containing an extensive PLB and large amounts of photoactive Pchlide-F655.

MeSH Terms
Alleles Arabidopsis/enzymology,genetics,growth & development Arabidopsis Proteins Carrier Proteins/genetics,metabolism Cell Differentiation Macromolecular Substances Mutagenesis Oxidoreductases/biosynthesis,genetics,physiology Oxidoreductases Acting on CH-CH Group Donors Plant Proteins/genetics,metabolism Plants, Genetically Modified Protochlorophyllide/metabolism Repressor Proteins/genetics,metabolism Ubiquitin-Protein Ligases
Chemicals
Arabidopsis Proteins Carrier Proteins Macromolecular Substances Plant Proteins Repressor Proteins Protochlorophyllide Oxidoreductases Oxidoreductases Acting on CH-CH Group Donors protochlorophyllide reductase AT2G32950 protein, Arabidopsis Ubiquitin-Protein Ligases
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Sperling U
Institute for Plant Sciences, Department of Plant Genetics, LFW D31, Swiss Federal Institute of Technology (ETH), Universitatstrasse 2, CH-8092 Zurich, Switzerland.
Franck F
van Cleve B
Frick G
Apel K
Armstrong G A
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Article Info
Journal
The Plant cell
Abbr.
Plant Cell
ISSN
1040-4651
DOI
10.1105/tpc.10.2.283
Published
1998-02-00
Pages
283-96
Language
English
Region
England
NLM ID
9208688
PMCID
PMC143981
Subset
IM
External Links
PubMed source DOI: 10.1105/tpc.10.2.283 PMC Full Text View journal details
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