Sustained net CO2 evolution during photosynthesis by marine microorganism

Tchernov, Dan; Hassidim, Miriam; Luz, Boaz; Sukenik, Assaf; Reinhold, Leonora; Kaplan, Aaron

doi:10.1016/s0960-9822(06)00330-7

Cited by 101 publications

(100 citation statements)

References 33 publications

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“…Thus the elevated efficiency of the enzyme carbonic anhydrase, capable of increasing the intracellular carbon dioxide levels to concentrations 1000 times higher than those in the external fluid, results in an efficiency carbon fixation reaction in these organisms. These mechanisms are consistent with various results found in the literature about microalgae with high carbon dioxide requirements and capable of accumulating high internal levels of inorganic carbon (Fridlyand et al, 1996;Marcus, 1997;Tchernov et al, 1997;Badger & Price, 2003;Cuaresma et al, 2006).…”

Section: Carbon Concentration Mechanisms In Microalgaesupporting

confidence: 92%

Microalgae-Based Systems for Carbon Dioxide Sequestration and Industrial Biorefineries

Jacob‐Lopes¹,

Franco²

2010

Biomass

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Section: Carbon Concentration Mechanisms In Microalgaesupporting

confidence: 92%

Microalgae-Based Systems for Carbon Dioxide Sequestration and Industrial Biorefineries

Jacob‐Lopes¹,

Franco²

2010

Biomass

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“…6). On the other hand, leakage as part of Ci cycling might help to dissipate excess energy (Tchernov et al 1997), which could explain the tolerance of E. huxleyi to high irradiances.…”

Section: Discussionmentioning

confidence: 99%

“…(1994). This method has been applied in several studies of cyanobacteria and freshwater microalgae (Palmqvist et al 1994;Tchernov et al 1997;Sültemeyer et al 1998) and recently also of marine phytoplankton (Burkhardt et al 2001;Rost et al 2003). Cellular leakage was estimated from the CO 2 efflux observed right after turning off the light .…”

Section: Methodsmentioning

confidence: 99%

Carbon acquisition of marine phytoplankton: Effect of photoperiod length

2006

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We investigated the carbon acquisition of three marine microalgae, Skeletonema costatum, Phaeocystis globosa, and Emiliania huxleyi in response to different light regimes. Rates of photosynthetic O 2 evolution and CO 2 and HCO uptake were measured by membrane inlet mass spectrometry in cells acclimated to cycles of 16 : 8 light :Ϫ 3 dark (LD; h : h) and 12 : 12 LD and were compared with those obtained under continuous light. In addition, cellular leakage was estimated for different photoperiods and ambient CO 2 concentrations during growth. Maximum rates of photosynthesis more or less doubled under LD cycles compared with continuous light. In S. costatum and E. huxleyi, a remarkably higher contribution of HCO to the overall carbon uptake was observed under LD cycles. Incontrast, P. globosa did not change its CO 2 : HCO uptake ratio in response to daylength. Half saturation concen-Ϫ 3 trations (K 1/2 ) for O 2 evolution and inorganic carbon (Ci) uptake were also influenced by the photoperiod. Under LD cycles K 1/2 values for photosynthesis in S. costatum and P. globosa were similar or higher compared with continuous light, whereas they were much lower in E. huxleyi. With the exception of CO 2 uptake in E. huxleyi and P. globosa, affinities for Ci decreased under the LD cycles. Cellular leakage was highest for E. huxleyi and lowest for S. costatum and generally decreased with increasing CO 2 concentration. Although this study confirms speciesspecific differences in the CO 2 -concentrating mechanisms (CCMs), the effect of daylength on CO 2 and HCO uptake Ϫ 3 has hitherto not been described. We put forward the idea that variations in light condition influence the cellular carbon demand, thereby imposing a stronger control on CCM regulation than the naturally occurring changes in CO 2 supply.

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“…Although Kaplan and colleagues have suggested that the massive transmembrane C i fluxes involved in the operation of CCM could help dissipate excess light energy (Tchernov et al 1997(Tchernov et al , 2003Kaplan & Reinhold 1999;Ogawa & Kaplan 2003), there is no experimental evidence on this aspect. Our results present evidence to support this notion for the first time.…”

Section: Discussionmentioning

confidence: 99%

Utilization of inorganic carbon in the edible cyanobacterium Ge‐Xian‐Mi (Nostoc) and its role in alleviating photo‐inhibition

Qiu

Liu

2004

Plant Cell & Environment

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The present work investigated the inorganic carbon (C i ) uptake, fluorescence quenching and photo-inhibition of the edible cyanobacterium Ge-Xian-Mi ( Nostoc ) to obtain an insight into the role of CO 2 concentrating mechanism (CCM) operation in alleviating photo-inhibition. Ge-XianMi used HCO 3 -in addition to CO 2 for its photosynthesis and oxygen evolution was greater than the theoretical rates of CO 2 production derived from uncatalysed dehydration of

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Sustained net CO2 evolution during photosynthesis by marine microorganism

Abstract: We report net, sustained CO2 evolution during photosynthesis. The results have implications for energy balance and pH regulation of the cells, for carbon cycling between the cells and the marine environment, and for the observed fractionation of stable carbon isotopes.

Cited by 101 publications

References 33 publications

Microalgae-Based Systems for Carbon Dioxide Sequestration and Industrial Biorefineries

Microalgae-Based Systems for Carbon Dioxide Sequestration and Industrial Biorefineries

Carbon acquisition of marine phytoplankton: Effect of photoperiod length

Utilization of inorganic carbon in the edible cyanobacterium Ge‐Xian‐Mi (Nostoc) and its role in alleviating photo‐inhibition

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