Membrane Composition and Physiological Activity of Plastids from an Oenothera Plastome Mutator-Induced Chloroplast Mutant

Plastids were isolated from a plastome mutator-induced mutant (pm7) of Oenothera hookeri and were analyzed for various physiological and biochemical attributes. No photosynthetic electron transport activity was detected in the mutant plastids. This is consistent with previous ultrastructural analysi...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-01, Vol.92 (1), p.254-261
Main Authors: JOHNSON, E. M, SEARS, B. B
Format: Article
Language:English
Subjects:
Barley
Biological and medical sciences
Carotenoids
Chlorophylls
Chloroplasts
Classical genetics, quantitative genetics, hybrids
Fatty acids
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Lipids
membrane composition
Pigments
Plants
Plastids
Pteridophyta, spermatophyta
Thylakoids
Vegetals
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Summary:Plastids were isolated from a plastome mutator-induced mutant (pm7) of Oenothera hookeri and were analyzed for various physiological and biochemical attributes. No photosynthetic electron transport activity was detected in the mutant plastids. This is consistent with previous ultrastructural analysis showing the absence of thylakoid membranes in the pm7 plastids and with the observation of aberrant processing and accumulation of chloroplast proteins in the mutant. In comparison to wild type, the mutant tissue lacks chlorophyll, and has significant differences in levels of four fatty acids. The analyses did not reveal any differences in carotenoid levels nor in the synthesis of several chloroplast lipids. The consequences of the altered composition of the chloroplast membrane are discussed in terms of their relation to the aberrant protein processing of the pm7 plastids. The pigment, fatty acid, and lipid measurements were also performed on two distinct nuclear genotypes (A/A and A/C) which differ in their compatibility with the plastid genome (type I) contained in these lines. In these cases, only chlorophyll concentrations differed significantly.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.92.1.254