Photoacclimation processes in phytoplankton: mechanisms, consequences, and applications

Dubinsky, Zvy; Stambler, Noga

doi:10.3354/ame01345

Cited by 213 publications

(178 citation statements)

References 83 publications

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“…This was hypothesized to indicate shading on a cellular level (Wei et al 2010). Content and composition of carotenoid is known to be affected as a result of photoacclimation (Dubinsky & Stambler 2009). Hence, detailed investigations of such changes may assist to elucidate the effect mechanisms of nanoparticles towards algae.…”

Section: Pigment Extractionmentioning

confidence: 99%

The challenges of testing metal and metal oxide nanoparticles in algal bioassays: titanium dioxide and gold nanoparticles as case studies

et al. 2012

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Section: Pigment Extractionmentioning

confidence: 99%

The challenges of testing metal and metal oxide nanoparticles in algal bioassays: titanium dioxide and gold nanoparticles as case studies

et al. 2012

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“…2). Low-irradiance conditions often generate increased chlorophyll concentrations per cell, but can also generate increased photosynthetic efficiencies (via changes in photosynthetic units), which can result in elevation of both parameters (Prezelin, 1981;Dubinsky and Stambler, 2009). P B m reflects the light-saturated rate, and presumably is set by the amount of carbon that can be reduced by the cells, which in turn is thought to be limited by the amount of chemical energy generated by the cells' photosystems.…”

Section: Controls Of Photosynthesis-irradiance Parametersmentioning

confidence: 99%

Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis

Smith

Donaldson

2015

Biogeosciences

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Abstract.A meta-analysis of photosynthesis-irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. P B m , the maximum, chlorophyll-specific, irradiancesaturated rate of photosynthesis, averaged 1.1 ± 0.06 µg C (µg Chl) −1 h −1 . Light-limited, chlorophyll-specific photosynthetic rates (α B ) averaged 0.030 ± 0.023 µg C (µg Chl) −1 h −1 (µmol quanta m −2 s −1 ) −1 . Significant variations in P B m and α B were found as a function of season, with spring maximum photosynthetic rates being 60 % greater than those in summer. Similarly, α values were 48 % greater in spring. There was no detectable effect of sampling location on the photosynthetic parameters, and temperature and macronutrient (NO 3 ) concentrations also did not have an influence. However, irradiance and carbon dioxide concentrations, when altered under controlled conditions, exerted significant influences on photosynthetic parameters. Specifically, reduced irradiance resulted in significantly decreased P B m and increased α B values, and increased CO 2 concentrations resulted in significantly increased P B m and α B values. Comparison of photosynthetic parameters derived at stations where iron concentrations were above and below 0.1 nM indicated that reduced iron levels were associated with significantly increased P B m values, confirming the importance of iron within the photosynthetic process. No significant difference was detected between stations dominated by diatoms and those dominated by the haptophyte Phaeocystis antarctica. The meta-analysis confirms the photosynthetic rates predicted from global analyses that are based solely on temperature and irradiance availability, but suggests that, for more accurate predictions of productivity in polar systems, a more detailed model that includes temporal effects of photosynthetic parameters will be required.

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“…With decreasing light, Symbiodinium harbor more LH pigments, while PP pigment concentrations decrease (Falkowski and Dubinsky, 1981;Dubinsky and Stambler, 2009). The enrichment of LH pigments leads to two potentially cooccurring photoacclimatization processes, namely increases in size and number of photosynthetic units (PSU) (Falkowski and Owens, 1980;Falkowski and Dubinsky, 1981).…”

Section: Introductionmentioning

confidence: 99%

Mesophotic coral depth acclimatization is a function of host-specific symbiont physiology

et al. 2015

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Mesophotic coral ecosystems receive increasing attention owing to their potential as deep coral refuges in times of global environmental change. Here, the mechanisms of coral holobiont photoacclimatization over a 60 m depth gradient in the central Red Sea were examined for the four coral genera Porites, Leptoseris, Pachyseris, and Podabacia. General acclimatization strategies were common to all host-symbiont combinations, e.g., Symbiodinium cell densities and photoprotective (PP) to light-harvesting pigment ratios both significantly decreased with water depth. Porites harbored Symbiodinium type C15 over the whole 60 m depth range, while Pachyseris and Podabacia had limited vertical distributions and hosted mainly Symbiodinium type C1. Symbiodinium type C15 had generally higher xanthophyll de-epoxidation rates and lower maximum quantum yields than C1, and also exhibited a strong photoacclimatory signal over depth that relates to the large distribution range of Porites. Interestingly, the coral host had an effect on Symbiodinium pigment composition. When comparing Symbiodinium type C1 in Podabacia and Pachyseris, the ß-carotene chl a −1 , the peridinin chl a −1 , and diadinoxanthin chl a −1 ratios were significantly different between host species. Our data support a view that depth acclimatization of corals in the mesophotics is facilitated by Symbiodinium physiology, which in turn is host-specific.

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Photoacclimation processes in phytoplankton: mechanisms, consequences, and applications

Cited by 213 publications

References 83 publications

The challenges of testing metal and metal oxide nanoparticles in algal bioassays: titanium dioxide and gold nanoparticles as case studies

The challenges of testing metal and metal oxide nanoparticles in algal bioassays: titanium dioxide and gold nanoparticles as case studies

Photosynthesis–irradiance responses in the Ross Sea, Antarctica: a meta-analysis

Mesophotic coral depth acclimatization is a function of host-specific symbiont physiology

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