Uptake dynamics of dissolved inorganic phosphate (DIP) and dissolved inorganic nitrate (DIN) in young Palmaria palmata (n = 49), cultivated in a range of DIP concentrations (0.0–6.0 µmol · L⁻¹) and nonlimiting DIN concentration (50 µmol · L⁻¹) under fully controlled laboratory conditions, were quantified in a ‘pulse‐and‐chase’ approach over 5 weeks. Two different uptake rates were specified: (1) surge uptake (V_S) after starvation and (2) maintenance uptake with filled nutrient pools (V_M). V_S for DIP of 1.57 ± 0.29 µmol · cm⁻² · d⁻¹ and DIN of 15.6 ± 4.3 µmol · cm⁻² · d⁻¹, as well as V_M for DIP of 0.57 ± 0.22 µmol · cm⁻² · d⁻¹ and DIN of 5.6 ± 2.1 µmol · cm⁻² · d⁻¹ were calculated. In addition, an absolute size of the internal storage capacity (ISC) for DIP of 22 µmol · cm² and DIN of 222 µmol · cm² was determined. A DIP‐to‐DIN uptake ratio of 1:10 under V_M showed a weekly rhythmic uptake pattern, highlighted by a high correlation between DIP and DIN uptake (R = 0.943). V_S for DIN did not occur under DIP depletion, but uptake rates increased with increasing DIP availability. Hence, DIP availability limited access to DIN, which was also reflected by total dissolvable protein concentrations in sporophytes, which ranged from 10.2 ± 2.5% to 24.6 ± 8.0% dry weight depending on DIP availability. Similarly, total dissolvable carbohydrate concentration ranged from 22.1 ± 3.6% to 54.3 ± 12.3% dry weight. The data presented in this study open further insight into ecological and physiological aspects of nutrient availability in P. palmata and allow for an optimization in cultivation.

中文翻译：

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棕榈果（红藻科）中磷酸盐和硝酸盐的吸收动态：养分利用率的生态和生理方面。

Uptake dynamics of dissolved inorganic phosphate (DIP) and dissolved inorganic nitrate (DIN) in young Palmaria palmata (n = 49), cultivated in a range of DIP concentrations (0.0–6.0 µmol · L⁻¹) and nonlimiting DIN concentration (50 µmol · L⁻¹) under fully controlled laboratory conditions, were quantified in a ‘pulse‐and‐chase’ approach over 5 weeks. Two different uptake rates were specified: (1) surge uptake (V_S) after starvation and (2) maintenance uptake with filled nutrient pools (V_M). V_S for DIP of 1.57 ± 0.29 µmol · cm⁻² · d⁻¹ and DIN of 15.6 ± 4.3 µmol · cm⁻² · d⁻¹, as well as V_M for DIP of 0.57 ± 0.22 µmol · cm⁻² · d⁻¹ and DIN of 5.6 ± 2.1 µmol · cm⁻² · d⁻¹ were calculated. In addition, an absolute size of the internal storage capacity (ISC) for DIP of 22 µmol · cm² and DIN of 222 µmol · cm² was determined. A DIP‐to‐DIN uptake ratio of 1:10 under V_M showed a weekly rhythmic uptake pattern, highlighted by a high correlation between DIP and DIN uptake (R = 0.943). V_S在DIP耗尽的情况下，DIN的吸收没有发生，但是随着DIP可用性的增加，吸收速率增加。因此，DIP可用性限制了获得DIN的机会，这也反映在孢子体中总可溶性蛋白浓度上，这取决于DIP可用性，从10.2±2.5％到24.6±8.0％干重。同样，总可溶性碳水化合物浓度范围为干重22.1±3.6％至54.3±12.3％。这项研究中提供的数据使人们进一步了解棕榈果营养素的生态和生理方面，并可以优化栽培方式。