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We have assessed how varying CO 2 (180, 380, and 720 μatm) and growth light intensity (40 and 400 μmol photons m −2 s −1 ) affected Trichodesmium erythraeum IMS101 growth and photophysiology over free iron (Fe′) concentrations between 20 and 9,600 pM. We found significant iron dependencies of growth...
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ftfrontimediafig:oai:figshare.com:article/6119636 2023-05-15T17:51:24+02:00 Image4.TIF Tobias G. Boatman Kevin Oxborough Martha Gledhill Tracy Lawson Richard J. Geider 2018-04-10T04:18:41Z https://doi.org/10.3389/fmicb.2018.00624.s004 https://figshare.com/articles/Image4_TIF/6119636 unknown doi:10.3389/fmicb.2018.00624.s004 https://figshare.com/articles/Image4_TIF/6119636 CC BY 4.0 CC-BY Microbiology Microbial Genetics Microbial Ecology Mycology Trichodesmium erythraeum Cyanobacteria ocean acidification CO2 iron limitation light intensity fluorescence light curves electron transport rates Image Figure 2018 ftfrontimediafig https://doi.org/10.3389/fmicb.2018.00624.s004 2018-04-11T22:57:07Z We have assessed how varying CO 2 (180, 380, and 720 μatm) and growth light intensity (40 and 400 μmol photons m −2 s −1 ) affected Trichodesmium erythraeum IMS101 growth and photophysiology over free iron (Fe′) concentrations between 20 and 9,600 pM. We found significant iron dependencies of growth rate and the initial slope and maximal relative PSII electron transport rates (rP m ). Under iron-limiting concentrations, high-light increased growth rates and rP m possibly indicating a lower allocation of resources to iron-containing photosynthetic proteins. Higher CO 2 increased growth rates across all iron concentrations, enabled growth to occur at lower Fe′ concentrations, increased rP m and lowered the iron half saturation constants for growth (K m ). We attribute these CO 2 responses to the operation of the CCM and the ATP spent/saved for CO 2 uptake and transport at low and high CO 2 , respectively. It seems reasonable to conclude that T. erythraeum IMS101 can exhibit a high degree of phenotypic plasticity in response to CO 2 , light intensity and iron-limitation. These results are important given predictions of increased dissolved CO 2 and water column stratification (i.e., higher light exposures) over the coming decades. Still Image Ocean acidification Frontiers: Figshare |
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Frontiers: Figshare |
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ftfrontimediafig |
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topic |
Microbiology Microbial Genetics Microbial Ecology Mycology Trichodesmium erythraeum Cyanobacteria ocean acidification CO2 iron limitation light intensity fluorescence light curves electron transport rates |
spellingShingle |
Microbiology Microbial Genetics Microbial Ecology Mycology Trichodesmium erythraeum Cyanobacteria ocean acidification CO2 iron limitation light intensity fluorescence light curves electron transport rates Tobias G. Boatman Kevin Oxborough Martha Gledhill Tracy Lawson Richard J. Geider Image4.TIF |
topic_facet |
Microbiology Microbial Genetics Microbial Ecology Mycology Trichodesmium erythraeum Cyanobacteria ocean acidification CO2 iron limitation light intensity fluorescence light curves electron transport rates |
description |
We have assessed how varying CO 2 (180, 380, and 720 μatm) and growth light intensity (40 and 400 μmol photons m −2 s −1 ) affected Trichodesmium erythraeum IMS101 growth and photophysiology over free iron (Fe′) concentrations between 20 and 9,600 pM. We found significant iron dependencies of growth rate and the initial slope and maximal relative PSII electron transport rates (rP m ). Under iron-limiting concentrations, high-light increased growth rates and rP m possibly indicating a lower allocation of resources to iron-containing photosynthetic proteins. Higher CO 2 increased growth rates across all iron concentrations, enabled growth to occur at lower Fe′ concentrations, increased rP m and lowered the iron half saturation constants for growth (K m ). We attribute these CO 2 responses to the operation of the CCM and the ATP spent/saved for CO 2 uptake and transport at low and high CO 2 , respectively. It seems reasonable to conclude that T. erythraeum IMS101 can exhibit a high degree of phenotypic plasticity in response to CO 2 , light intensity and iron-limitation. These results are important given predictions of increased dissolved CO 2 and water column stratification (i.e., higher light exposures) over the coming decades. |
format |
Still Image |
author |
Tobias G. Boatman Kevin Oxborough Martha Gledhill Tracy Lawson Richard J. Geider |
author_facet |
Tobias G. Boatman Kevin Oxborough Martha Gledhill Tracy Lawson Richard J. Geider |
author_sort |
Tobias G. Boatman |
title |
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title_full |
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publishDate |
2018 |
url |
https://doi.org/10.3389/fmicb.2018.00624.s004 https://figshare.com/articles/Image4_TIF/6119636 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
doi:10.3389/fmicb.2018.00624.s004 https://figshare.com/articles/Image4_TIF/6119636 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmicb.2018.00624.s004 |
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1766158539923914752 |