Nitrogen availability influences the biochemical composition and photosynthesis of tank-cultivated Ulva rigida (Chlorophyta) |
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Authors: | Juan Luis Gómez Pinchetti Elena del Campo Fernández Paula Moreno Díez Guillermo García Reina |
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Institution: | (1) Instituto de Algología Aplicada, Universidad de Las Palmas de G.C., Muelle de Taliarte s/n, 35214 Telde, Las Palmas, Canary Islands, Spain |
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Abstract: | Physiological and biochemical changes in relation to inorganic nitrogen availability were studied for tank-cultivated Ulva
rigida grown under nitrogen- enriched and nitrogen-depleted seawater. U. rigida was initially cultivated in nitrogen-enriched
seawater (daily concentrations of NH4+ and NO3- + NO2- ranged between 0.5–1.7 and 0.06–0.15 mg L-1, respectively), then transferred
to nitrogen-depleted seawater where photosynthetic capacity decreased to zero after 23 d. At the time (14 d) when photosynthetic
rates were lower than 2.0 μmol O2 g-1 FW min-1 and strong bleaching had occurred, some algae were returned to the initial
nitrogen-enriched seawater to study recovery from N-limited growth. Data on biochemical composition (chlorophylls, ash, caloric
content, fatty acids and dietary fibres) and colouration varied significantly depending on the nitrogen conditions. C:N ratios
correlated significantly with biochemical parameters. Fatty acid (FA) synthesis continued during the N-starvation period;
saturated and mono-unsaturated FA increased to a maximun of 72.2%, while poly-unsaturated fatty acids (PUFA) decreased to
27.7%. During the N-enriched recovery period, the reverse was found. C:N ratios above 10 correlated with carbohydrate synthesis
as shown by the dietary fibre level. Under nitrogen enriched conditions, C:N ratios decreased along with a decrease in fibre
level. Under controlled conditions, nitrogen represents a major influence on the development of intensive tank cultivation
of Ulva rigida, not only by affecting parameters closely related to nitrogen metabolism but also some clearly influenced by
carbon uptake.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | ammonium C:N ratio tank culture dietary fibre fatty acids nitrogen photosynthesis Ulva rigida |
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