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000035010 0247_ $$2DOI$$a10.1104/pp.104.040980
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000035010 041__ $$aeng
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000035010 084__ $$2WoS$$aPlant Sciences
000035010 1001_ $$0P:(DE-HGF)0$$avan Dongen, J. T.$$b0
000035010 245__ $$aPhloem import and storage metabolism are highly coordinated by the low oxygen concentrations within developing wheat seeds
000035010 260__ $$aRockville, Md.: Soc.$$bJSTOR$$c2004
000035010 300__ $$a1809 - 1821
000035010 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000035010 440_0 $$04987$$aPlant Physiology$$v135$$x0032-0889
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000035010 520__ $$aWe studied the influence of the internal oxygen concentration in seeds of wheat (Triticum aestivum) on storage metabolism and its relation to phloem import of nutrients. Wheat seeds that were developing at ambient oxygen (21%) were found to be hypoxic (2.1%). Altering the oxygen supply by decreasing or increasing the external oxygen concentration induced parallel changes in the internal oxygen tension. However, the decrease in internal concentration was proportionally less than the reduction in external oxygen. This indicates that decreasing the oxygen supply induces short-term adaptive responses to reduce oxygen consumption of the seeds. When external oxygen was decreased to 8%, internal oxygen decreased to approximately 0.5% leading to a decrease in energy production via respiration. Conversely, increasing the external oxygen concentration above ambient levels increased the oxygen content as well as the energy status of the seeds, indicating that under normal conditions the oxygen supply is strongly limiting for energy metabolism in developing wheat seeds. The intermediate metabolites of seed storage metabolism were not substantially affected when oxygen was either increased or decreased. However, at subambient external oxygen concentrations (8%) the metabolic flux of carbon into starch and protein, measured by injecting (14)C-Suc into the seeds, was reduced by 17% and 32%, respectively, whereas no significant effect was observed at superambient (40%) oxygen. The observed decrease in biosynthetic fluxes to storage compounds is suggested to be part of an adaptive response to reduce energy consumption preventing excessive oxygen consumption when oxygen supply is limited. Phloem transport toward ears exposed to low (8%) oxygen was significantly reduced within 1 h, whereas exposing ears to elevated oxygen (40%) had no significant effect. This contrasts with the situation where the distribution of assimilates has been modified by removing the lower source leaves from the plant, resulting in less assimilates transported to the ear in favor of transport to the lower parts of the plant. Under these conditions, with two strongly competing sinks, elevated oxygen (40%) did lead to a strong increase in phloem transport to the ear. The results show that sink metabolism is affected by the prevailing low oxygen concentrations in developing wheat seeds, determining the import rate of assimilates via the phloem.
000035010 536__ $$0G:(DE-Juel1)FUEK257$$2G:(DE-HGF)$$aChemie und Dynamik der Geo-Biosphäre$$cU01$$x0
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000035010 650_2 $$2MeSH$$aCell Hypoxia: drug effects
000035010 650_2 $$2MeSH$$aEnergy Metabolism
000035010 650_2 $$2MeSH$$aKinetics
000035010 650_2 $$2MeSH$$aNucleotides: metabolism
000035010 650_2 $$2MeSH$$aOxygen: metabolism
000035010 650_2 $$2MeSH$$aOxygen: pharmacology
000035010 650_2 $$2MeSH$$aPlant Structures: drug effects
000035010 650_2 $$2MeSH$$aPlant Structures: metabolism
000035010 650_2 $$2MeSH$$aSeeds: metabolism
000035010 650_2 $$2MeSH$$aTriticum: drug effects
000035010 650_2 $$2MeSH$$aTriticum: metabolism
000035010 650_7 $$00$$2NLM Chemicals$$aNucleotides
000035010 650_7 $$07782-44-7$$2NLM Chemicals$$aOxygen
000035010 650_7 $$2WoSType$$aJ
000035010 7001_ $$0P:(DE-Juel1)129390$$aRoeb, G. W.$$b1$$uFZJ
000035010 7001_ $$0P:(DE-Juel1)129307$$aDautzenberg, M.$$b2$$uFZJ
000035010 7001_ $$0P:(DE-HGF)0$$aFröhlich, A.$$b3
000035010 7001_ $$0P:(DE-HGF)0$$aVigeolas, H.$$b4
000035010 7001_ $$0P:(DE-Juel1)VDB30117$$aMinchin, P. R.$$b5$$uFZJ
000035010 7001_ $$0P:(DE-HGF)0$$aGeigenberger, P.$$b6
000035010 773__ $$0PERI:(DE-600)2004346-6$$a10.1104/pp.104.040980$$gVol. 135, p. 1809 - 1821$$p1809 - 1821$$q135<1809 - 1821$$tPlant physiology$$v135$$x0032-0889$$y2004
000035010 8567_ $$2Pubmed Central$$uhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC519092
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000035010 9141_ $$y2004
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