Inorganic-carbon assimilation in the green seaweed Ulva rigida C.Ag. (Chlorophyta)

Björk, Mats; Haglund, Kurt; Ramazanov, Ziyadin; García‐Reina, Guillermo; Pedersén, Marianne

doi:10.1007/bf00201637

Cited by 58 publications

(40 citation statements)

References 14 publications

(15 reference statements)

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“…Among the latter, bicarbonate ions (HCO 3 -) may be used as a potential carbon source for photosynthetic processes (Larkum et al, 1989;Johnston et al, 1992;Bjôrk et al, 1992). However, in most cases, it is considered that in the natural environment photosynthetic and respiratory budgets do not change TA values due to the CaCO 3 oversaturation situation in surface waters (Sournia, 1982;Copin-Montégut, 1996).…”

Section: Introductionmentioning

confidence: 99%

Estimation of photosynthesis and calcification rates of <i>Corallina elongata</i> Ellis and Solander, 1786, by measurements of dissolved oxygen, pH and total alkalinity

Haïkali¹,

Bensoussan²,

Romano³

et al. 2004

Sci. Mar.

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SUMMARY: Experiments were conducted on the calcareous red alga, Corallina elongata, a species representative of shallow water vegetal cover in Mediterranean areas with biomass ranging from 820 to 2544 gDW.m -2 , in order to estimate its productivity and calcification rates. Carbonate and oxygen budgets were estimated on samples incubated in situ under natural light cycles, by measuring initial and final dissolved oxygen, pH and alkalinity levels. In light conditions, oxygen concentrations and pH values increased as a consequence of oxygen production and carbon dioxide consumption due to the productivity process, and were a direct function of sample biomass. Strictly-reverse dynamics were recorded in dark conditions. A comparison of photosynthetic performances was conducted on a non-calcareous green alga, Ulva rigida, which showed higher rates of oxygen production and pH modification than C. elongata, but no significant change in total alkalinity. For C. elongata, a significant decrease in total alkalinity with incubation time was observed under light conditions, which was directly related to the algal sample biomass (R 2 = 0.95; n=16). Light to dark calcification ratio (L/D) was about 3.6. In these experiments, the photosynthetic quotient of C. elongata was 0.89, its net carbon productivity was 2.5 g C.m -2 .d -1 , gross production to daily respiration (Pg/R) was about 4.9 and its calcification rate was estimated at 13.8 g CaCO 3 .m -2 .d -1 .Key words: photosynthesis, calcification, dissolved oxygen, pH, total alkalinity, inorganic carbon, Corallina elongata, Ulva rigida. RESUMEN: ESTIMACIÓN DE TASAS DE FOTOSÍNTESIS Y DE CALCIFICACIÓN EN CORALLINA ELONGATA ELLIS Y SOLANDER, 1786, A TRAVÉS DE MEDIDAS DE OXÍGENO DISUELTO, PH Y ALCALINIDAD TOTAL.-Los experimentos se efectuaron sobre el alga calcárea roja, Corallina elongata, un representante de aguas someras en áreas mediterráneas con biomasa comprendida entre los límites de 820 GDW.m -2 y 2544 GDW.m -2 para estimar su productividad y las tasas de calcificación. Las concentraciones de carbonato y oxígeno fueron estimados sobre muestras incubadas in situ bajo ciclos naturales de luz, midiendo el oxí-geno disuelto al inicio y al final, así como los niveles de alcalinidad y pH. En condiciones de luz, las concentraciones de oxígeno y el pH aumentaron como consecuencia de la producción de oxígeno y el consumo de dióxido de carbono debido al proceso de productividad, y eran una función directa de la biomasa de la muestra. La dinámica estrictamente inversa fue registrada en condiciones de oscuridad. Una comparación del funcionamiento fotosintético se llevó a cabo sobre un alga nocalcárea verde, Ulva rigida, que presentó tasas más altas de producción de oxígeno y variación de pH que C. elongata, pero ningún cambio significativo en alcalinidad total. Para C. elongata, una disminución significativa en alcalinidad total con el tiempo de incubación fue observada en condiciones de luz, que directamente fueron relacionadas con la biomasa de muestra algal (R 2 = 0.95; n=16). La ...

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Section: Introductionmentioning

confidence: 99%

Estimation of photosynthesis and calcification rates of <i>Corallina elongata</i> Ellis and Solander, 1786, by measurements of dissolved oxygen, pH and total alkalinity

Haïkali¹,

Bensoussan²,

Romano³

et al. 2004

Sci. Mar.

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“…Some seaweeds use only dissolved CO 2 (e.g. Surif & Raven, 1989;Maberly, 1990), whereas others can acquire both CO 2 and HCO EC 4.2.1.1) that catalyses the interconversion of HCO À 3 and CO 2 extracellularly (Bjo¨rk et al, 1992(Bjo¨rk et al, , 1993Haglund et al, 1992a, b;Johnson et al, 1992;Beer, 1994;Axelsson et al, 1995). Thus the HCO À 3 in seawater can be utilized indirectly as a CO 2 reservoir.…”

Section: Introductionmentioning

confidence: 99%

Acquisition of inorganic carbon byEndarachne binghamiae(Scytosiphonales, Phaeophyceae)

Zou

Gao

2010

European Journal of Phycology

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Photosynthetic acquisition of inorganic carbon was studied in the brown seaweed Endarachne binghamiae J. Agardh. Photosynthesis was saturated at 245 mmol photons m À2 s À1 and photoinhibition did not occur at an irradiance as high as 750 mmol photons m À2 s À1 . The dependence of O 2 evolution on inorganic carbon (Ci) concentration demonstrated that the normal Ci composition in natural seawater was not saturating for irradiance-saturated photosynthesis. Three lines of evidence demonstrated that E. binghamiae was able to acquire HCO À 3 as a source of Ci for photosynthesis: (i) the high value of photosynthetic conductance for CO 2 (220.6 mm s À1 ); (ii) the high pH compensation point of 9.7; and (iii) the measured photosynthetic rates being in excess of the theoretical maximum rates supported solely by the CO 2 supply from the spontaneous dehydration of HCO À 3 in the bulk seawater. In order to establish the mechanism of Ci acquisition, specific inhibitors and a proton buffer were applied to examine their inhibitory effects on photosynthesis. No inhibitory effects were found for the proton buffer tris(hydroxymethyl)aminomethane and the anion exchanger inhibitor, 4,4 0 -diisothiocyano-stilbene-2,2 0 -disulphonate. By contrast, photosynthetic O 2 evolution in natural seawater was significantly depressed by the extracellular carbonic anhydrase (CA) activity inhibitor, acetazolamide, and the plasma membrane P-type H þ -ATPase inhibitor, vanadate.These results suggested that carbon acquisition from the natural seawater was mostly through the external CA-mediated HCO À 3 dehydration mechanism, and that P-type H þ -ATPase (proton pump) in the plasma membrane simultaneously functioned in photosynthesis of E. binghamiae. Additional experiments on the O 2 exchange versus pH value relationship indicated that, in contrast to photosynthesis, dark respiration of E. binghamiae was insensitive to the change of pH in the seawater, which resulted in a decreasing instantaneous balance between net carbon gain and respiratory carbon loss at high pH values in seawater.

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“…In addition, the pH affects seaweed photosynthesis through the appearance of CO 2 or HCO 3 . At low pH where a higher concentration of CO 2 is available, the affinity for inorganic carbon is greater than at high pH (Aizawa and Miyachi, 1986;Drechsler and Beer, 1991), which is proved by Ulva rigida thalli photosynthesis rate (Björk et al, 1992). Thus, providing a higher biomass of Sargassum at low pH than the ambient pH in a short-term.…”

Section: Discussionmentioning

confidence: 83%

Effects of Temperature and pH on the Growth of Sargassum linearifolium and S. podacanthum in Potassium-Fortified Inland Saline Water

Bui¹,

Luu²,

Fotedar³

2018

American Journal of Applied Sciences

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Inorganic-carbon assimilation in the green seaweed Ulva rigida C.Ag. (Chlorophyta)

Cited by 58 publications

References 14 publications

Estimation of photosynthesis and calcification rates of <i>Corallina elongata</i> Ellis and Solander, 1786, by measurements of dissolved oxygen, pH and total alkalinity

Estimation of photosynthesis and calcification rates of <i>Corallina elongata</i> Ellis and Solander, 1786, by measurements of dissolved oxygen, pH and total alkalinity

Acquisition of inorganic carbon byEndarachne binghamiae(Scytosiphonales, Phaeophyceae)

Effects of Temperature and pH on the Growth of Sargassum linearifolium and S. podacanthum in Potassium-Fortified Inland Saline Water

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