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  • 1
    Electronic Resource
    Electronic Resource
    The effect of nitrogen refeeding on the carbohydrate content into nitrogen-starved cells of Platymonas striata Butcher (1977)
    Springer
    Planta 136 (1977), S. 159-162 
    Details
    ISSN: 1432-2048
    Keywords: Ammonium ion assimilation ; Nitrate assimilation ; Nitrogen assimilation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396192
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on ammonium-assimilating enzymes of Platymonas striata Butcher (Prasinophyceae) (1978)
    Springer
    Planta 138 (1978), S. 123-125 
    Details
    ISSN: 1432-2048
    Keywords: Glutamate dehydrogenase ; Glutamine synthetase ; Glutamate synthetase ; Nitrogen assimilation ; Platymonas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Platymonas striata Butcher displays significant levels of glutamate synthase (GS) (EC 2.6.1.53) and glutamine synthetase (GOGAT) (EC 6.3.1.2.), but very low levels of glutamate dehydrogenase (GDH) (EC 1.4.1.4). This suggests that the GS/GOGAT pathway is important for nitrogen assimilation. The in vitro rates of enzyme activity can however only account for about 10% of the in vivo rates of nitrogen assimilation. Nitrogen-starvation reduced GS activity to undetectable levels. On nitrate or ammonium ion refeeding the cellular GS activity was rapidly restored, and reached levels of 56% and 91% greater than the unstarved values 24h after refeeding nitrate or ammonium respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391167
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