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Effects of CO2 enrichment on photosynthesis, growth, and nitrogen metabolism of the seagrass Zostera noltii

2012-10Journal article Open access
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dc.contributor.authorAlexandre, Ana
dc.contributor.authorSilva, Joao
dc.contributor.authorBuapet, Pimchanok
dc.contributor.authorBjork, Mats
dc.contributor.authorSantos, Rui
dc.date.accessioned2018-12-07T14:58:04Z
dc.date.available2018-12-07T14:58:04Z
dc.date.issued2012-10
dc.description.abstractSeagrass ecosystems are expected to benefit from the global increase in CO2 in the ocean because the photosynthetic rate of these plants may be C-i-limited at the current CO2 level. As well, it is expected that lower external pH will facilitate the nitrate uptake of seagrasses if nitrate is cotransported with H+ across the membrane as in terrestrial plants. Here, we investigate the effects of CO2 enrichment on both carbon and nitrogen metabolism of the seagrass Zostera noltii in a mesocosm experiment where plants were exposed for 5 months to two experimental CO2 concentrations (360 and 700 ppm). Both the maximum photosynthetic rate (Pm) and photosynthetic efficiency (alpha) were higher (1.3- and 4.1-fold, respectively) in plants exposed to CO2-enriched conditions. On the other hand, no significant effects of CO2 enrichment on leaf growth rates were observed, probably due to nitrogen limitation as revealed by the low nitrogen content of leaves. The leaf ammonium uptake rate and glutamine synthetase activity were not significantly affected by increased CO2 concentrations. On the other hand, the leaf nitrate uptake rate of plants exposed to CO2-enriched conditions was fourfold lower than the uptake of plants exposed to current CO2 level, suggesting that in the seagrass Z. noltii nitrate is not cotransported with H+ as in terrestrial plants. In contrast, the activity of nitrate reductase was threefold higher in plant leaves grown at high-CO2 concentrations. Our results suggest that the global effects of CO2 on seagrass production may be spatially heterogeneous and depend on the specific nitrogen availability of each system. Under a CO2 increase scenario, the natural levels of nutrients will probably become limiting for Z. noltii. This potential limitation becomes more relevant because the expected positive effect of CO2 increase on nitrate uptake rate was not confirmed.
dc.description.sponsorshipFundacao para a Ciencia e a Tecnologia [SFRH/BD/21487/2005]; POCI; FSE; COST; EC; EU
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1002/ece3.333
dc.identifier.issn2045-7758
dc.identifier.urihttp://hdl.handle.net/10400.1/11843
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWiley-Blackwell
dc.relationMETABOLISMO DO AZOTO NA ANGIOSPÉRMICA MARINHA ZOSTERA NOLTII
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectNitrate reductase-activity
dc.subjectElevated atmospheric Co2
dc.subjectOcean acidification
dc.subjectInorganic carbon
dc.subjectMarina L
dc.subjectNutrient-uptake
dc.subject2 Morphotypes
dc.subjectGracilaria Sp
dc.subjectEelgrass
dc.subjectLight
dc.titleEffects of CO2 enrichment on photosynthesis, growth, and nitrogen metabolism of the seagrass Zostera noltii
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMETABOLISMO DO AZOTO NA ANGIOSPÉRMICA MARINHA ZOSTERA NOLTII
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F21487%2F2005/PT
oaire.citation.endPage2630
oaire.citation.issue10
oaire.citation.startPage2620
oaire.citation.titleEcology and Evolution
oaire.citation.volume2
person.familyNameAlexandre
person.familyNameSilva
person.familyNameBjörk
person.familyNameSantos
person.givenNameAna
person.givenNameJoão
person.givenNameMats
person.givenNameRui
person.identifier82814
person.identifier553001
person.identifier42560
person.identifier.ciencia-idA711-4AF6-8F36
person.identifier.ciencia-id8216-527E-1BD4
person.identifier.ciencia-id9B18-444D-2244
person.identifier.orcid0000-0001-7164-1487
person.identifier.orcid0000-0002-7211-1661
person.identifier.orcid0000-0003-0363-110X
person.identifier.orcid0000-0002-7861-4366
person.identifier.ridJ-7874-2013
person.identifier.ridB-4299-2010
person.identifier.ridB-4168-2008
person.identifier.scopus-author-id35836826900
person.identifier.scopus-author-id7403023547
person.identifier.scopus-author-id7004180171
person.identifier.scopus-author-id7201375018
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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