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AMMONIUM AND UV RADIATION STIMULATE THE ACCUMULATION OF MYCOSPORINE‐LIKE AMINO ACIDS IN PORPHYRA COLUMBINA (RHODOPHYTA) FROM PATAGONIA, ARGENTINA1
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The combined effects of ammonium concentration and UV radiation on the red alga Porphyra columbina (Montagne) from the Patagonian coast (Chubut, Argentina) was determined using short‐term (less than a week) experimentation. Discs of P. columbina were incubated with three ammonium concentrations (0, 50, and 300 μM NH 4 Cl) in anilluminated chamber (PAR=300 μmol photons·m−2·s−1, UVA=15 W·m−2, UVB=0.7 W·m−2) at 15°C. Algae incubated at 300 μM ammonium showed a significant increase (P<0.05) in the concentration of mycosporine‐like amino acids (MAAs) compared with the initial value or with the other ammonium treatments. The increase of MAAs was, however, a function of the quality of irradiance received, with a higher increase in samples exposed to UVA compared with UVB (29% and 5% increase, respectively). However, UVB radiation was more effective in inducing MAA synthesis per unit energy received by the algae. Samples exposed to PAR only had an intermediate increase in MAA concentration of 16%. Chl a concentration decreased through the incubation with the greatest decrease at high ammonium concentration. Phycobiliprotein (BP) decreased through time with the smallest decrease occurring at high ammonium concentration. Photoinhibition (as a decrease of optimal quantum yield) was significantly greater under nitrogen‐deprived conditions than that under replete ammonium levels. Maximal gross photosynthesis (GP max), as oxygen evolution, and maximal electron transport rate (ETR max), as chl fluorescence, increased with the ammonium concentration. Positive relationships between maximal GP or ETR and pigment ratios (BP/chl a and MAAs/chl a) and negative relationships with chl a concentration were found.
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“The cellular concentration and type of MAA vary with species, geographical location and environment (e.g. nitrate concentration) in which they are found.”
From Mycosporine-Like Amino Acids for Skin Photoprotection (2019) · cites this paper as [36]
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“There are also ways to increase the MAA content such as with irradiation with different visible light/UVR sources, and treatment with nitrate compounds.”
From Mycosporine-Like Amino Acids for Skin Photoprotection (2019) · cites this paper as [36]
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“An increase in extracellular nitrogen concentration has also demonstrated an increase in MAA production, suggesting a potential role in intracellular nitrogen storage [68].”
From Mycosporine-Like Amino Acids for Skin Photoprotection (2019) · cites this paper as [68]
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Metadata
- Authors
- Peinado, N. K., Abdala Díaz, R. T., Figueroa, F. L., & Helbling, E. W.
- Affiliations
- Universidad de Málaga (ES)
- Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
- Corresponding author
- Figueroa, Félix L.
- Venue
- Journal of Phycology
- Publisher
- Wiley
- Published
- 2004-02-27
- Volume
- 40
- Issue
- 2
- Pages
- 248-259
- ISSN
- 0022-3646 (ISSN-L)
- 1529-8817
- OpenAlex
- W2171837882
- Cited by
- 203
- References
- 77
- Citations by year
- 2026: 3 · 2025: 9 · 2024: 9 · 2023: 13 · 2022: 11 · 2021: 11 · 2020: 10 · 2019: 13 · 2018: 11 · 2017: 11 · 2016: 1 · 2015: 4 · 2014: 18 · 2013: 6 · 2012: 7
- FWCI
- 6.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Phycology (publishedVersion)
- CONICET Digital (CONICET) (submittedVersion, cc-by-nc-sa)
- Funders
- Consejo Nacional de Investigaciones Científicas y Técnicas
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal plant biology
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Keywords
- mycosporine-like amino acids, ammonium, ultraviolet radiation, UV-B radiation, UVA, nitrogen limitation, photoprotection, photoinhibition, phycobiliproteins, photosynthesis, electron transport rate, red algae, Patagonia
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