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The effects of reduced and elevated CO2 and O2 on the seaweed Lomentaria articulata (1999)

Kübler, Janet E. ; Johnston, Andrew M. ; Raven, John A.

Oxford, UK : Blackwell Science Ltd

Plant, cell & environment 22 (1999), S. 0

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ISSN: 1365-3040

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: We grew a non-bicarbonate using red seaweed, Lomentaria articulata (Huds.) Lyngb., in media aerated with four O2 concentrations between 10 and 200% of current ambient [O2] and four CO2 concentrations between 67 and 500% of current ambient [CO2], in a factorial design, to determine the effects of gas composition on growth and physiology. The relative growth rate of L. articulata increased with increasing [CO2] up to 200% of current ambient [CO2] but was unaffected by [O2]. The relative growth enhancement, on a carbon basis, was 52% with a doubling of [CO2] but fell to 23% under 5× ambient [CO2]. Plants collected in winter responded more extremely to [CO2] than did plants collected in the summer, although the overall pattern was the same. Discrimination between stable carbon isotopes (Δ13C) increased with increasing [CO2] as would be expected for diffusive CO2 acquisition. Tissue C and N were inversely related to [CO2]. Growth in terms of biomass appeared to be limited by conversion of photosynthate to new biomass rather than simply by diffusion of CO2, suggesting that non-bicarbonate-using macroalgae, such as L. articulata, may not be directly analogous to C3 higher plants in terms of their responses to changing gas composition.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-3040.1999.00492.x

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The analysis of photosynthesis in air and water of Ascophyllum nodosum (L.) Le Jol. (1986)

Johnston, Andrew M. ; Raven, John A.

Springer

Oecologia 69 (1986), S. 288-295

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ISSN: 1432-1939

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary The photosynthetic characteristics for the intertidal macroalga Ascophyllum nodosum were examined in air and water. Under ambient conditions of temperature (10° C) inorganic carbon concentrations (15.63 mmol CO2 m-3 or 2.0 mol TIC m-3) and light (500 μmol photons m-2 s-1) photosynthesis was slightly greater by the exposed alga than by the submerged alga. In both environments photosynthesis was light saturated at 200 μmol photons m-2 s-1. The relationship between CO2 concentration and photosynthesis in air could be accurately analysed using Michaelis-Menten kinetics, although the range of concentrations used were not saturating. In contrast the application of the Lineweaver-Burk and Woolf plots to aquatic photosynthesis was not suitable as the experimental data was similar to the Blackman type curves and not rectangular hyperbolae. This was reflected by the applicability of the Hill-Whittingham equation to describe the photosynthesis curves. The effect of unstirred layers and other limiting factors is discussed in relation to the kinetic parameters, V max and K m.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00377636

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Carbon fixation Photosynthesis in a marine diatom (2001)

Raven, John A. ; Beardall, John ; Leegood, Richard C. ; [et al.]

[s.l.] : Nature Publishing Group

Nature 412 (2001), S. 40-41

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] The first stable product of photosynthetic carbon fixation by land plants is either the three-carbon molecule phosphoglycerate (in C3 plants) or the four-carbon compounds malate or aspartate (in C4 and CAM (crassulacean-acid metabolism) plants). Reinfelder et al. infer ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/35083694

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A comparison of reproductive allocation and reproductive effort between semelparous and iteroparous fucoids (Fucales, Phaeophyta) (1996)

Brenchley, Jennie L. ; Raven, John A. ; Johnston, Andrew M.

Springer

Hydrobiologia 326-327 (1996), S. 185-190

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ISSN: 1573-5117

Keywords: Fucus serratus ; Himanthalia elongata ; iteroparous ; reproductive allocation ; reproductive effort ; seaweed ; semelparous

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Reproductive allocation, the proportion of total dry weight allocated to receptacle tissue and reproductive effort, the proportion of reproductive carbon requirement contributed by receptacle photosynthesis, were measured in two fucoid algal species Fucus serratus and Himanthalia elongata at sites in NE Scotland. Reproductive development takes over ten months in H. elongata, a semelparous (single reproductive event) species, and reproductive allocation at receptacle maturity is over 98%. Following gamete release, the whole thallus dies. In contrast, reproductive development in F. serratus takes four months. Fucus serratus is iteroparous (capable of multiple reproductive events), reproductive allocation is 38.6% for the first reproductive event and 50.5% for the following year's event. In Fucus serratus, the receptacles appear to make a major contribution to their own carbon requirements after the first month of reproductive development. The receptacles of Himanthalia elongata contribute only a small proportion of the receptacle carbon requirements in the first four months of reproductive development, after which the contribution made through receptacle photosynthesis increases.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00047805

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