The effect of nitrogen refeeding on the carbohydrate content into nitrogen-starved cells of Platymonas striata Butcher |
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Authors: | PA Edge T R Ricketts |
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Institution: | (1) Department of Botany, School of Biological Sciences, The University, NG7 2RD Nottingham, UK |
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Abstract: | Studies on the mean cellular carbohydrate contents of Platymonas striata Butcher under conditions of nitrogen-starvation, and after refeeding these starved cultures with either nitrate or ammonium ions (growing under continuous illumination or with an alternating light/dark regime) have shown that nitrogen-starved cells accumulated abnormal amounts of cellular carbohydrate and that nitrogen refeeding produced a marked drop in the cellular carbohydrate. Cells grown in a light/dark regime accumulated less carbohydrates than those grown in continuous light. The mean cellular carbohydrate levels 16 h after nitrogen refeeding were still much in excess of those of cells grown with normal nutrition. It was therefore suggested that the differences in nitrogen uptakes in this period — when comparing either the uptake of cells grown in continuous light with that of cells grown in a light/dark regime; or when comparing the uptakes of cells presented with either nitrate or ammonium ions and grown in a light/dark regime —cannot be directly due to shortages of carbohydrate for the provision of carbon skeletons for nitrogen assimilation. |
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Keywords: | Ammonium ion assimilation Nitrate assimilation Nitrogen assimilation |
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