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Regulation of growth in Laminaria digitata: use of in-vivo nitrate reductase activities as an indicator of nitrogen limitation in field populations of Laminaria spp.

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Abstract

The seasonal variation in growth rate of a population of Laminaria digitata (Huds.) Lamour growing at Arbroath, Scotland was studied between August 1981 and September 1982, and was found to follow the biphasic annual cycle typical of this genus. Growth rates were maximum (0.3 cm cm-1 mo-1) in early June and minimum (0.05 cm cm-1 mo-1) between September and January. An analysis of the relationship between the seasonal changes in environmental factors (inorganic nitrogen concentrations, irradiance and temperature) with those of growth rate and the accumulation or mobilisation of cellular reserves of carbohydrates and nitrate, indicated that growth was nitrogen-limited between June and October and light-limited (with a possible co-involvement of temperature) for the remainder of the year. These conclusions were supported by the seasonal changes in the ratio of actual: potential in-vivo nitrate reductase activities in L. digitata, thus confirming the suitability of this technique for monitoring the occurrence of nitrogen limitation in Laminaria spp. The seasonal changes in blade nitrate reductase activities closely followed those of growth rate, with maximum activities [0.3 μmol NO -3 reduced g-1 (wet wt) h-1] being present in late May and minimum levels [0.01 μmol NO -3 reduced g-1 (wet wt) h-1] occurring between November and March. The correlation observed between nitrate reductase activities and growth rate is consistent with the ability of Laminaria spp. to store excess inorganic nitrogen, available during winter and early spring, as NO -3 , and with the requirement to conserve enzyme protein during the summer period of nitrogen limitation.

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Authors and Affiliations

  1. Biologische Anstalt Helgoland, D-2192, Helgoland, Federal Republic of Germany

    I. R. Davison

  2. Department of Biological Sciences, Dundee University, DD1; 4HN, Dundee, Scotland, UK

    M. Andrews & W. D. P. Stewart

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  1. I. R. Davison
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  2. M. Andrews
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  3. W. D. P. Stewart
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Communicated by O. Kinne, Oldendorf

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Davison, I.R., Andrews, M. & Stewart, W.D.P. Regulation of growth in Laminaria digitata: use of in-vivo nitrate reductase activities as an indicator of nitrogen limitation in field populations of Laminaria spp.. Mar. Biol. 84, 207–217 (1984). https://doi.org/10.1007/BF00393006

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