Photooxidative destruction of chloroplasts and its consequences for expression of nuclear genes [Sinapis alba]

Expression of nuclear genes involved in plastidogenesis is known to be controlled by light via phytochrome. Examples are the small subunit (SSU) of ribulose-1,5-bisphosphate carboxylase and the light harvesting chlorophyll a/b binding protein of photosystem II (LHCP). In the present study we show th...

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Bibliographic Details
Published in:Planta 1986, Vol.167 (1), p.106-113
Main Authors: Oelm ller, R., Mohr, H.
Format: Article
Language:English
Subjects:
Antiserum
Biological and medical sciences
brassica alba
cell structure
Chlorophylls
Chloroplasts
Cotyledons
enzimas
enzyme
enzymes
estructura celular
Fundamental and applied biological sciences. Psychology
Gels
Gene expression
Messenger RNA
metabolism
metabolisme
metabolismo
Molecular and cellular biology
Molecular genetics
Mustards
Photooxidation
plaste
plastidios
Plastids
Seedlings
Sinapis alba
structure cellulaire
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Summary:Expression of nuclear genes involved in plastidogenesis is known to be controlled by light via phytochrome. Examples are the small subunit (SSU) of ribulose-1,5-bisphosphate carboxylase and the light harvesting chlorophyll a/b binding protein of photosystem II (LHCP). In the present study we show that, beside phytochrome, the integrity of the plastid is essential for the expression of the pertinent nuclear genes as measured at the level of translatable mRNA. When the plastids are severely damaged by photooxidation in virtually carotenoid-free mustard (Sinapis alba L.) seedling cotyledons (made carotenoid-free by the application of Norflurazon, NF), almost no SSU, no SSU precursor, LHCP and LHCP precursor can be detected by immunological assays, and almost no translatable mRNA of SSU and LHCP can be found, although the levels and rates of phytochrome-mediated syntheses of representative cytoplasmic, mitochondrial and glyoxisomal enzymes are not adversely affected and morphogenesis of the mustard seedling proceeds normally (Reiß et al. 1983; Planta 159, 518—528). Norflurazon per se has no effect on the amount of translatable mRNA of SSU and LHCP as shown by irradiation of NF-treated seedlings with far-red light (FR) which strongly activates phytochrome but does not cause photooxidation in the plastids. It is concluded that a signal from the plastid is required to allow the phytochrome-mediated appearance of translatable mRNA for SSU and LHCP. Seedlings not treated with NF show a higher level of translatable mRNALHCP in red light (RL) compared to FR, whereas the mRNASSU levels are the same in RL and FR. These facts indicate that the level of translatable mRNALHCP is adversely affected if the apoprotein is not incorporated into the thylakoid membrane.
ISSN:0032-0935
1432-2048
DOI:10.1007/bf00446376