Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta)

Ecology and Evolution
Ralf RautenbergerMichael Y Roleda

Abstract

Carbon physiology of a genetically identified Ulva rigida was investigated under different CO2(aq) and light levels. The study was designed to answer whether (1) light or exogenous inorganic carbon (Ci) pool is driving growth; and (2) elevated CO2(aq) concentration under ocean acidification (OA) will downregulate CAext-mediated [Formula: see text] dehydration and alter the stable carbon isotope (δ (13)C) signatures toward more CO2 use to support higher growth rate. At pHT 9.0 where CO2(aq) is <1 μmol L(-1), inhibition of the known [Formula: see text] use mechanisms, that is, direct [Formula: see text] uptake through the AE port and CAext-mediated [Formula: see text] dehydration decreased net photosynthesis (NPS) by only 56-83%, leaving the carbon uptake mechanism for the remaining 17-44% of the NPS unaccounted. An in silico search for carbon-concentrating mechanism elements in expressed sequence tag libraries of Ulva found putative light-dependent [Formula: see text] transporters to which the remaining NPS can be attributed. The shift in δ (13)C signatures from -22‰ toward -10‰ under saturating light but not under elevated CO2(aq) suggest preference and substantial [Formula: see text] use to support photosynthesis and growth. U...Continue Reading

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Citations

Aug 16, 2015·Photosynthesis Research·María Jesús García-SánchezAntonio Flores-Moya
Jul 16, 2016·PloS One·Courtney C StepienJ Timothy Wootton
May 14, 2016·PloS One·Craig S Young, Christopher J Gobler
Apr 19, 2017·Scientific Reports·Christopher E CornwallCatriona L Hurd
Jun 3, 2017·Journal of Experimental Botany·Concepción IñiguezFrancisco J L Gordillo

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Datasets Mentioned

BETA
OTA63969
OTA63970
EF110302

Methods Mentioned

BETA
PCR
environmental stress

Software Mentioned

OOISensor
ImageJ
RAxML
JMP Pro
VecScreen
SWCO2
R
R Foundation for

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