CO2 modulation of the rates of photosynthesis and light-dependent O2 consumption in<i>Trichodesmium</i>

Boatman, Tobias G.; Davey, Phillip; Lawson, Tracy; Geider, Richard J.

doi:10.1093/jxb/ery368

Cited by 14 publications

(13 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The data groupings consisted of: (a) combined low/mid CO 2 , (b) combined low/high CO 2 , (c) combined mid/ high CO 2 and (d) all CO 2 data combined. Note, as previous studies have shown that Trichodesmium's maximum growth rate (µ max ) is significantly reduced at low CO 2 relative to mid CO 2 , and is consistently ~10% higher from mid to high CO 2 (Boatman, Davey, Lawson, & Geider, 2018;Boatman et al, 2017;Boatman, Mangan, Lawson, & Geider, 2018;Boatman, Oxborough, et al, 2018), ′ max was maintained independent between CO 2 conditions. Having processed all model iterations by optimizing all parameter groupings, maximum likelihood (L) values were calculated using each model's residual sum of squares and the number of data points (n = 184).…”

Section: Parameter Optimizationsupporting

confidence: 56%

Projected expansion of Trichodesmium’s geographical distribution and increase in growth potential in response to climate change

Boatman

Upton

Lawson

et al. 2020

Global Change Biology

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Parameter Optimizationsupporting

confidence: 56%

Projected expansion of Trichodesmium’s geographical distribution and increase in growth potential in response to climate change

Boatman

Upton

Lawson

et al. 2020

Global Change Biology

Self Cite

View full text Add to dashboard Cite

show abstract

“…For Trichodesmium and Dolichospermum, only a PQ below 1 (0.8; Fig. 3) could explain the ratio of measured O 2 and pH gradients, in agreement with previous reports of PQ values for Trichodesmium (e.g., PQ 0.45-0.61, Carpenter and Roenneberg 1995; PQ 1.0, Boatman et al 2019). The slight underestimation of pH deviations by the model even at these low PQ levels (Fig.…”

Section: Microenvironment Carbonate Chemistry Under Present-day Conditionssupporting

confidence: 91%

Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future pCO₂ levels

Eichner

Wolf‐Gladrow

Ploug

2021

Limnology & Oceanography

View full text Add to dashboard Cite

Photosynthesis and respiration cause distinct chemical microenvironments within cyanobacterial aggregates. Here, we used microsensors and a diffusion-reaction model to characterize gradients in carbonate chemistry and investigate how these are affected by ocean acidification in Baltic vs. Pacific aggregates (Nodularia and Dolichospermum vs. Trichodesmium). Microsensor measurements of O 2 and pH were performed under in situ and expected future pCO 2 levels on Nodularia and Dolichospermum aggregates collected in the Baltic Sea. Under in situ conditions, O 2 and pH levels within the aggregates covered ranges of 80-175% air saturation and 7.7-9.4 in dark and light, respectively. Carbon uptake in the light was predicted to reduce HCO 3 À by 100-150 μmol L À1and CO 2 by 3-6 μmol L À1 in the aggregate center compared to outside, inducing strong CO 2 depletion (down to 0.5 μmol L À1 CO 2 remaining in the center) even when assuming that HCO 3 À covered 80-90% of carbon uptake.Under ocean acidification conditions, enhanced CO 2 availability allowed for significantly lower activity of carbon concentrating mechanisms, including a reduction of the contribution of HCO 3 À to carbon uptake by up to a factor of 10. The magnification of proton gradients under elevated pCO 2 that was predicted based on a lower buffer capacity was observed in measurements despite a concurrent decrease in photosynthetic activity. In summary, we provide a quantitative image of the inorganic carbon environment in cyanobacterial aggregates under present-day and expected future conditions, considering both the individual and combined effects of the chemical and biological processes that shape these environments.

show abstract

“…The involvement of Flavodiiron proteins (Flvs) in light-dependent O 2 uptake was further established in cyanobacteria (Helman et al, 2003;Allahverdiyeva et al, 2013), and more recently in microalgae (Chaux et al, 2017). MIMS is nowadays widely used to understand the fate of the photosynthetic electron flow in various environmental conditions and mutant of cyanobacteria (Ermakova et al, 2016;Boatman et al, 2018;Luimstra et al, 2019), microalgae (Fisher and Halsey, 2016), or coral reef symbiosis (Einbinder et al, 2016).…”

Section: Assessment Of Photosynthetic Oxygen Exchangementioning

confidence: 99%

Membrane Inlet Mass Spectrometry: A Powerful Tool for Algal Research

Burlacot

Li‐Beisson

et al. 2020

Front. Plant Sci.

View full text Add to dashboard Cite

Since the first great oxygenation event, photosynthetic microorganisms have continuously shaped the Earth's atmosphere. Studying biological mechanisms involved in the interaction between microalgae and cyanobacteria with the Earth's atmosphere requires the monitoring of gas exchange. Membrane inlet mass spectrometry (MIMS) has been developed in the early 1960s to study gas exchange mechanisms of photosynthetic cells. It has since played an important role in investigating various cellular processes that involve gaseous compounds (O 2 , CO 2 , NO, or H 2) and in characterizing enzymatic activities in vitro or in vivo. With the development of affordable mass spectrometers, MIMS is gaining wide popularity and is now used by an increasing number of laboratories. However, it still requires an important theory and practical considerations to be used. Here, we provide a practical guide describing the current technical basis of a MIMS setup and the general principles of data processing. We further review how MIMS can be used to study various aspects of algal research and discuss how MIMS will be useful in addressing future scientific challenges.

show abstract

CO2 modulation of the rates of photosynthesis and light-dependent O2 consumption inTrichodesmium

Abstract: The ratio of light-driven O2 consumption to gross photosynthetic O2 evolution decreased significantly with increasing CO2, which is probably due to a reduced cost of operating the carbon-concentrating mechanism.

Cited by 14 publications

References 54 publications

Projected expansion of Trichodesmium’s geographical distribution and increase in growth potential in response to climate change

Projected expansion of Trichodesmium’s geographical distribution and increase in growth potential in response to climate change

Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future pCO₂ levels

Membrane Inlet Mass Spectrometry: A Powerful Tool for Algal Research

Contact Info

Product

Resources

About

CO2 modulation of the rates of photosynthesis and light-dependent O2 consumption inTrichodesmium

Abstract: The ratio of light-driven O2 consumption to gross photosynthetic O2 evolution decreased significantly with increasing CO2, which is probably due to a reduced cost of operating the carbon-concentrating mechanism.

Cited by 14 publications

References 54 publications

Projected expansion of Trichodesmium’s geographical distribution and increase in growth potential in response to climate change

Projected expansion of Trichodesmium’s geographical distribution and increase in growth potential in response to climate change

Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future pCO2 levels

Membrane Inlet Mass Spectrometry: A Powerful Tool for Algal Research

Contact Info

Product

Resources

About

Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present‐day and future pCO₂ levels