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The effect of nitrogen refeeding on starved cells of Platymonas striata Butcher

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Abstract

A rapid uptake of nitrogen was observed in nitrogen-starved cells of Platymonas striata after refeeding with ammonium or nitrate ions. This was followed by a net loss of nitrogen per cell. Cells initially grown in and then starved in a regime of continuous light showed greater increases in average cell nitrogen on refeeding with ammonium or nitrate ions than did cells initially grown in and then starved in a regime of alternating light and darkness. A particulate subcellular location was observed for nitrate reductase (EC 1.6.6.1) in broken cell suspensions prepared by sonication. Nitrite reductase (EC 1.6.6.4) was located in the soluble fraction of these cell suspensions. Broken cell preparations displayed a lowered nitrate reductase activity as compared with the particulate component of these preparations. This was shown not to be due to heat-stable inhibitors present in the soluble phase of the cell. It appeared to be an artefact produced by the high nitrite reductase activity of the broken cell preparations, which removed much of the nitrite as it was formed. Nitrogen starvation of nitrate-grown cultures produced cellular increases in nitrate reductase and nitrite reductase activities which were further increased after the addition of nitrate. The results are discussed.

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Abbreviations

ASP2:

complete culture medium

ASP2 INF:

medium lacking in inorganic nitrogen

ASP2 NF:

medium lacking all nitrogen

NAR:

nitrate reductase

NIR:

nitrite reductase

EDTA:

Ethylenediaminetetracetic acid

PVP:

Polyvinylpyrollidone, M.W. 44,000

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Authors and Affiliations

  1. Department of Botany, School of Biological Sciences, The University, NG7 2RD, Nottingham, U.K.

    T. R. Ricketts & P. A. Edge

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  1. T. R. Ricketts
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  2. P. A. Edge
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Ricketts, T.R., Edge, P.A. The effect of nitrogen refeeding on starved cells of Platymonas striata Butcher. Planta 134, 169–176 (1977). https://doi.org/10.1007/BF00384967

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  • DOI: https://doi.org/10.1007/BF00384967

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