Light-saturated photosynthesis — Limitation by electron transport or carbon fixation?

Sukenik, Assaf; Bennett, John; Falkowski, Paul G.

doi:10.1016/0005-2728(87)90216-7

Cited by 272 publications

(225 citation statements)

References 21 publications

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“…RuBisCO (Sukenik et al 1987;MacIntyre and Geider 1996). Although high 521 temperatures increase enzymatic activity and carbon fixation (Davison 1991;Sakshaug 522 et al 1997), the seawater temperature in the diatom-dominated area was significantly 523 lower than that in the non-diatom-dominated area (Wilcoxon rank sum test, p < 0.05).…”

Section: P−e Parameters 380mentioning

confidence: 98%

Phytoplankton community composition and photosynthetic physiology in the Australian sector of the Southern Ocean during the austral summer of 2010/2011

et al. 2014

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Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. However, the relationship between phytoplankton community composition and primary productivity remains elusive in this region. We investigated the community composition and photosynthetic physiology of surface phytoplankton assemblages in the Australian sector of the Southern Ocean from December 2010 to January 2011. There were significant latitudinal variations in hydrographic and biological parameters along 110A degrees E and 140A degrees E. Surface (5 m) chlorophyll a (chl a) concentrations measured with high-performance liquid chromatography varied between 0.18 and 0.99 mg m(-3). The diatom contribution to the surface chl a biomass increased in the south, as estimated with algal chemotaxonomic pigment markers, while the contributions of haptophytes and chlorophytes decreased. In our photosynthesis-irradiance (P-E) curve experiment, the maximum photosynthetic rate normalized to chl a (), initial slope (alpha (*)), the maximum quantum yield of carbon fixation (I broken vertical bar (c max)), and the photoinhibition index (beta (*)) were higher in the region where diatoms contributed > 50 % to the chl a biomass. In addition, there were statistically significant correlations between the diatom contribution to the chl a biomass and the P-E parameters. These results suggested that the changes in the phytoplankton community composition, primarily in diatoms, could strongly affect photosynthetic physiology in the Australian sector of the Southern Ocean

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Section: P−e Parameters 380mentioning

confidence: 98%

Phytoplankton community composition and photosynthetic physiology in the Australian sector of the Southern Ocean during the austral summer of 2010/2011

et al. 2014

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“…E k and ETR max RCII but not s max PSII;478 are explained by changes in both MLD and integrated PPFD when data from each province are treated individually ( (Behrenfeld et al, 2004). Several potential mechanisms may operate in microalgae, (1) the electron donor pool size to PSI (Falkowski and Raven, 1997), (2) PSI photosynthetic unit size (3) the ratio of ETR to cyclic electron flow around PSI (Allen, 2002) and (4) Calvin cycle activity (Sukenik et al, 1987;Geider and MacIntyre, 2002). Unfortunately, we are unable to determine the significance of these various mechanisms from the data presented here.…”

Section: Regulation Of Etr Max Rcii and Psii Light Absorptionmentioning

confidence: 99%

“…Secondly, if light-saturated carbon fixation is controlled by the Calvin Cycle then ETR max RCII will decrease with an increase in the ratio of RCII to Calvin Cycle activity (Sukenik et al, 1987;Behrenfeld et al, 2004). Moore et al (2006) have recently demonstrated that such regulation of RCII concentration to Calvin Cycle activity may underpin photoacclimatory regulation of electron turnover in coastal phytoplankton.…”

Section: Regulation Of Etr Max Rcii and Psii Light Absorptionmentioning

confidence: 99%

Photosynthetic electron turnover in the tropical and subtropical Atlantic Ocean

Suggett

Moore

Marañón

et al. 2006

Deep Sea Research Part II: Topical Studies in Oceanography

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Photosynthetic electron transport directly generates the energy required for carbon fixation and thus underlies the aerobic metabolism of aquatic systems. We determined photosynthetic electron turnover rates, ETRs, from ca. 100 FRR fluorescence water-column profiles throughout the subtropical and tropical Atlantic during six Atlantic Meridional Transect cruises (AMT 6, May-June 1998, to AMT 11, September-October 2000. Each FRR fluorescence profile yielded a water-column ETR-light response from which the maximum electron turnover rate ðETR max RCII Þ, effective absorption (s PSII ) and light saturation parameter (E k ) specific to the concentration of photosystem II reaction centres (RCIIs) were calculated. ETR max RCII and E k increased whilst s PSII decreased with mixed-layer depth and the daily integrated photosynthetically active photon flux when all provinces were considered together. These trends suggested that variability in maximum ETR can be partly attributed to changes in effective absorption. Independent bio-optical measurements taken during AMT 11 demonstrated that s PSII variability reflects taxonomic and physiological differences in the phytoplankton communities. ETR max RCII and E k , but not s PSII , remained correlated with mixed-layer depth and daily integrated photosynthetically active photon flux when data from each oceanic province were considered separately, indicating a decoupling of electron turnover and carbon fixation rates within each province. Comparison of maximum ETRs with 14 C-based measurements of P max further suggests that light absorption and C fixation are coupled to differing extents for the various oligotrophic Atlantic provinces. We explore the importance of quantifying RCII concentration for determination of ETRs and interpretation of ETR-C fixation coupling. r

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“…Photoacclimation in free-living phytoplankton has been demonstrated in several studies (Brown and Richardson, 1968;Meeson and Sweeney, 1982;Olaizola and Yamamoto, 1994;Prezelin, 1976), however these studies have only measured photoacclimation over periods of less than 3 weeks whereas our results show that outdoor cultures of P. carterae take 4 weeks to photoacclimate fully. Several mechanisms are known to be involved in photoacclimation (Raven and Geider, 2003): (1) changes in the composition and cellular abundance of light-harvesting pigment-protein complexes, (2) changes in the abundance and ratios of PSI and PSII reaction centres and of other catalysts within the electron transport chain, (3) changes in the activity of CO 2 -fixing enzymes such as Rubisco and/or electron transport systems (Rivkin et al, 1982;Sukenik et al, 1987), and (4) changes in the content of photoprotective pigments (Macintyre et al, 2002). The exact mechanism of photoacclimation in P. carterae remains to be determined, however the slow rate of acclimation suggests it may be mainly due to changes in enzyme systems such as Rubisco.…”

Section: Cultivation Period Nmentioning

confidence: 99%

Limits to productivity of the algaPleurochrysis carterae(Haptophyta) grown in outdoor raceway ponds

Moheimani

Borowitzka

2006

Biotech & Bioengineering

118

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This study examined the effects of oxygen concentration, pond temperature and irradiance on productivity and CaCO 3 formation of the coccolith-forming alga, Pleurochrysis carterae CCMP647 grown in semi-continuous culture in outdoor raceway ponds. During the day the oxygen content of the pond increases markedly and P. carterae photosynthesis is inhibited by these high O 2 concentrations with the inhibition increasing with increasing temperature. The high irradiance outdoors presents less of a problem to photosynthesis and productivity as the algae can acclimate well to high irradiances over a period of several weeks. Pond depth also effects productivity and this effect varies with season. During autumn, productivities were highest at depths of 13 to 16 cm, and decreased when the depth was increased. During summer productivity was much lower at 13 cm pond depth and increased when the depth was increased to 16, 18 and 21 cm. Heating the ponds in the morning by approximately 3 to 58C improves productivity by 11%-21%, presumably because this allows the algae to photosynthesise faster in the conditions of low [O 2 ] which occur in the early morning.

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Light-saturated photosynthesis — Limitation by electron transport or carbon fixation?

Cited by 272 publications

References 21 publications

Phytoplankton community composition and photosynthetic physiology in the Australian sector of the Southern Ocean during the austral summer of 2010/2011

Phytoplankton community composition and photosynthetic physiology in the Australian sector of the Southern Ocean during the austral summer of 2010/2011

Photosynthetic electron turnover in the tropical and subtropical Atlantic Ocean

Limits to productivity of the algaPleurochrysis carterae(Haptophyta) grown in outdoor raceway ponds

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