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Non-photosynthetic enhancement of growth by high CO2 level in the nitrophilic seaweed Ulva rigida C. Agardh (Chlorophyta)

The results indicate that the regulation of N assimilation by CO2 in U. rigida might involve a different pathway from that proposed for higher plants, and the role of organic C release as an effective regulatory mechanism maintaining the internal C:N balance in response to different CO2 levels is discussed.
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Utilization of HCO3 − at high pH by the brown macroalga Laminaria saccharina

The brown macroalga Laminaria saccharina exhibits a type of HCO3 − utilization that could be almost completely inhibited either by proton buffers or by acetazolamide, an inhibitor of extracellularly operating carbonic anhydrase, which may have an adaptational advantage in colder regions of the sea.
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An Inventory of UV-Absorbing Mycosporine-Like Amino Acids in Macroalgae from Polar to Warm-Temperate Regions

The data support the idea that MAAs represent a least for red macroalgae a natural defense system against exposure to biologically harmful UV-radiation.
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AMMONIUM AND UV RADIATION STIMULATE THE ACCUMULATION OF MYCOSPORINE‐LIKE AMINO ACIDS IN PORPHYRA COLUMBINA (RHODOPHYTA) FROM PATAGONIA, ARGENTINA 1

Photoinhibition (as a decrease of optimal quantum yield) was significantly greater under nitrogen‐deprived conditions than that under replete ammonium levels, and positive relationships between maximal GP or ETR and pigment ratios (BP and MAAs/chl a) and negative relationships with chl a concentration were found.
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Effects of different levels of CO2 on photosynthesis and cell components of the red alga Porphyra leucosticta

Photosynthesis and cell composition of Porphyraleucosticta discs grown at low (< 0.0001% in air), current (control) and high (1% CO2 in air)inorganic carbon (Ci) concentrations were analyzed.…
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External carbonic anhydrase and affinity for inorganic carbon in intertidal macroalgae

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Relations between electron transport rates determined by pulse amplitude modulated chlorophyll fluorescence and oxygen evolution in macroalgae under different light conditions

Results are in agreement with the known action spectra for photosynthesis in these species and the slopes of GP versus ETR or ΦPSIIversus ΦO_2 were lower in the algae with the highest N assimilation capacity, estimated as nitrate reductase activity and internal nitrogen contents, than that observed in U. olivascens.
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Physical factors driving intertidal macroalgae distribution: physiological stress of a dominant fucoid at its southern limit

Mechanistic approaches that are designed to analyse the interactive effects of physical stressors may improve the levels of confidence in predicted range shifts of species.
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Effects of light intensity, CO2 and nitrogen supply on lipid class composition of Dunaliella viridis

Lipid class composition of Dunaliella viridis Teodoresco was analysed using thin layer chromatography coupled with flame ionisation detection (TLC/FID technique). D. viridis was cultured under four…
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Antioxidant activity of mycosporine-like amino acids isolated from three red macroalgae and one marine lichen

The potential of MAAs in photoprotection can be considered high due to a double function: (1) UV chemical screening with high efficiency for UVB and UVA regions of the solar spectrum, and (2) their antioxidant capacity.
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