Blue Light Effects on the Level of Translation and Transcription
Recent findings suggest a relationship between light absorbed by a suitable photoreceptor system and the synthesis of discrete RNA species respective and proteins in developmental processes. Many of these are controlled by phytochrome. As to its mode of operation a mechanism of “differential gene activation and gene repression” has been proposed . Indeed, recent studies on light-induced chloroplast differentiation seem to support this hypothesis. When dark-grown plants had been treated with red light the level of translatable mRNAs for several nuclear-coded proteins like light-harvesting chlorophyll a,b protein (LHCP; [1, 5]), the small subunit (SSU) and the large subunit (LSU) of ribulosebisphosphate carboxylase/oxygenase (RuBPCase; [19, 21]), and the precursor of a plastid-encoded polypeptide of 32,000 MW  increases drastically. The light-induced changes also include a decrease or disappearance of mRNA’s respective of the corresponding plastid proteins which is well documented for NADPH-protochlorophyllide oxidoreductase (PCR; [1, 13]).
KeywordsBlue Light Tobacco Cell Slime Mold Chloroplast Development Precursor Polypeptide
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