Influence of light quality on the ribosomal RNA levels inWolffia arrhiza: Comparison of phosphate and magnesium limited chemostat populations |
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Authors: | M Eichhorn H Augsten |
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Institution: | (1) Section of Biology, Department of Plant Physiology, Friedrich-Schiller-University Jena, DDR-6900 Jena, Von-Hase-Weg 3, GDR |
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Abstract: | Wolffia arrhiza (L.) Wimm. was grown axenically in the chemostat under white luminescent light (photon fluence rate 23 ujnol m-2 s-1) and phosphate or magnesium limitation (0.075 and 0.01 jxmol 1-1, respectively). Aliquots (1 g fresh mass) were taken from the continuous cultures and were irradiated for 1 h with either
white light (control) or monochromatic blue (453 nm) or red (654 nm) light. The amount of 5-3H]-uridine incorporated into cytosolic and chloroplastic rRNAs during these exposures was estimated and following results
were obtained: In phosphate limited plants rod light considerably reduced and blue light slightly increased label incorporation
as compared with the control. Moreover, in red light, chloroplast incorporation is relatively more slowed down than that in
the cytosolic compartment (34 % as compared to 59 % of the control). In blue light the enhancement is approximately equal
in both compartments. In magnesium limited plants incorporation under both blue and red light is moderately slower as compared
with the control. In both cases also the retardation is slightly greater in the chloroplast than in the cytoplasm. The results
suggest that rRNA metabolism is controlled by light quality as well as by mineral nutrition. |
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