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Detecting long-term...
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Ehlers, InaUmeå universitet,Institutionen för medicinsk kemi och biofysik
(författare)
Detecting long-term metabolic shifts using isotopomers : CO2-driven suppression of photorespiration in C-3 plants over the 20th century
- Artikel/kapitelEngelska2015
Förlag, utgivningsår, omfång ...
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2015-12-07
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Proceedings of the National Academy of Sciences,2015
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electronicrdacarrier
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LIBRIS-ID:oai:DiVA.org:umu-114013
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-114013URI
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https://doi.org/10.1073/pnas.1504493112DOI
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https://res.slu.se/id/publ/69116URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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Terrestrial vegetation currently absorbs approximately a third of anthropogenic CO2 emissions, mitigating the rise of atmospheric CO2. However, terrestrial net primary production is highly sensitive to atmospheric CO2 levels and associated climatic changes. In C-3 plants, which dominate terrestrial vegetation, net photosynthesis depends on the ratio between photorespiration and gross photosynthesis. This metabolic flux ratio depends strongly on CO2 levels, but changes in this ratio over the past CO2 rise have not been analyzed experimentally. Combining CO2 manipulation experiments and deuterium NMR, we first establish that the intramolecular deuterium distribution (deuterium isotopomers) of photosynthetic C-3 glucose contains a signal of the photorespiration/photosynthesis ratio. By tracing this isotopomer signal in herbarium samples of natural C-3 vascular plant species, crops, and a Sphagnum moss species, we detect a consistent reduction in the photorespiration/photosynthesis ratio in response to the similar to 100-ppm CO2 increase between similar to 1900 and 2013. No difference was detected in the isotopomer trends between beet sugar samples covering the 20th century and CO2 manipulation experiments, suggesting that photosynthetic metabolism in sugar beet has not acclimated to increasing CO2 over >100 y. This provides observational evidence that the reduction of the photorespiration/photosynthesis ratio was ca. 25%. The Sphagnum results are consistent with the observed positive correlations between peat accumulation rates and photosynthetic rates over the Northern Hemisphere. Our results establish that isotopomers of plant archives contain metabolic information covering centuries. Our data provide direct quantitative information on the "CO2 fertilization" effect over decades, thus addressing a major uncertainty in Earth system models.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Augusti, AngelaUmeå universitet,Institutionen för medicinsk kemi och biofysik
(författare)
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Betson, Tatiana R.Umeå universitet,Institutionen för medicinsk kemi och biofysik
(författare)
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Nilsson, MatsSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)47620
(författare)
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Marshall, JohnSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,University of Idaho(Swepub:slu)50037
(författare)
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Schleucher, JuergenUmeå universitet,Institutionen för medicinsk kemi och biofysik(Swepub:umu)jusc0001
(författare)
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Umeå universitetInstitutionen för medicinsk kemi och biofysik
(creator_code:org_t)
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Sveriges lantbruksuniversitet
Sammanhörande titlar
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Ingår i:Proceedings of the National Academy of Sciences of the United States of America: Proceedings of the National Academy of Sciences112:51, s. 15585-155900027-84241091-6490
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