Uptake kinetics and storage capacity of dissolved inorganic phosphorus and corresponding N:P dynamics in Ulva lactuca (Chlorophyta)
© 2017 Phycological Society of America.
| Veröffentlicht in: | Journal of phycology. - 1966. - 54(2018), 2 vom: 15. Apr., Seite 215-223 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2018
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| Zugriff auf das übergeordnete Werk: | Journal of phycology |
| Schlagworte: | Journal Article Ulva lactuca nitrate uptake phosphate uptake storage capacity uptake kinetics Phosphorus 27YLU75U4W Nitrogen N762921K75 |
| Zusammenfassung: | © 2017 Phycological Society of America. Dissolved inorganic phosphorus (DIP) is an essential macronutrient for maintaining metabolism and growth in autotrophs. Little is known about DIP uptake kinetics and internal P-storage capacity in seaweeds, such as Ulva lactuca (Chlorophyta). Ulva lactuca is a promising candidate for biofiltration purposes and mass commercial cultivation. We exposed U. lactuca to a wide range of DIP concentrations (1-50 μmol · L-1 ) and a nonlimiting concentration of dissolved inorganic nitrogen (DIN; 5,000 μmol · L-1 ) under fully controlled laboratory conditions in a "pulse-and-chase" assay over 10 d. Uptake kinetics were standardized per surface area of U. lactuca fronds. Two phases of responses to DIP-pulses were measured: (i) a surge uptake (VS ) of 0.67 ± 0.10 μmol · cm-2 · d-1 and (ii) a steady state uptake (VM ) of 0.07 ± 0.03 μmol · cm-2 · d-1 . Mean internal storage capacity (ISCP ) of 0.73 ± 0.13 μmol · cm-2 was calculated for DIP. DIP uptake did not affect DIN uptake. Parameters of DIN uptake were also calculated: VS = 12.54 ± 1.90 μmol · cm-2 · d-1 , VM = 2.26 ± 0.86 μmol · cm-2 · d-1 , and ISCN = 22.90 ± 6.99 μmol · cm-2 . Combining ISC and VM values of P and N, nutrient storage capacity of U. lactuca was estimated to be sufficient for ~10 d. Both P and N storage capacities were filled within 2 d when exposed to saturating nutrient concentrations, and uptake rates declined thereafter at 90% for DIP and at 80% for DIN. Our results contribute to understanding the ecological aspects of nutrient uptake kinetics in U. lactuca and quantitatively evaluating its potential for bioremediation and/or biomass production for food, feed, and energy |
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| Beschreibung: | Date Completed 09.09.2019 Date Revised 09.09.2019 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1529-8817 |
| DOI: | 10.1111/jpy.12612 |