Hauptseite > Publikationsdatenbank > Phloem import and storage metabolism are highly coordinated by the low oxygen concentrations within developing wheat seeds > print

001     35010
005     20190625111041.0
024 7 _ |2 pmid
|a pmid:15247408
024 7 _ |2 pmc
|a pmc:PMC519092
024 7 _ |2 DOI
|a 10.1104/pp.104.040980
024 7 _ |2 WOS
|a WOS:000222692700058
024 7 _ |a altmetric:152206
|2 altmetric
037 _ _ |a PreJuSER-35010
041 _ _ |a eng
082 _ _ |a 580
084 _ _ |2 WoS
|a Plant Sciences
100 1 _ |a van Dongen, J. T.
|b 0
|0 P:(DE-HGF)0
245 _ _ |a Phloem import and storage metabolism are highly coordinated by the low oxygen concentrations within developing wheat seeds
260 _ _ |a Rockville, Md.: Soc.
|b JSTOR
|c 2004
300 _ _ |a 1809 - 1821
336 7 _ |a Journal Article
|0 PUB:(DE-HGF)16
|2 PUB:(DE-HGF)
336 7 _ |a Output Types/Journal article
|2 DataCite
336 7 _ |a Journal Article
|0 0
|2 EndNote
336 7 _ |a ARTICLE
|2 BibTeX
336 7 _ |a JOURNAL_ARTICLE
|2 ORCID
336 7 _ |a article
|2 DRIVER
440 _ 0 |a Plant Physiology
|x 0032-0889
|0 4987
|v 135
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a We 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.
536 _ _ |a Chemie und Dynamik der Geo-Biosphäre
|c U01
|2 G:(DE-HGF)
|0 G:(DE-Juel1)FUEK257
|x 0
588 _ _ |a Dataset connected to Web of Science, Pubmed
650 _ 2 |2 MeSH
|a Cell Hypoxia: drug effects
650 _ 2 |2 MeSH
|a Energy Metabolism
650 _ 2 |2 MeSH
|a Kinetics
650 _ 2 |2 MeSH
|a Nucleotides: metabolism
650 _ 2 |2 MeSH
|a Oxygen: metabolism
650 _ 2 |2 MeSH
|a Oxygen: pharmacology
650 _ 2 |2 MeSH
|a Plant Structures: drug effects
650 _ 2 |2 MeSH
|a Plant Structures: metabolism
650 _ 2 |2 MeSH
|a Seeds: metabolism
650 _ 2 |2 MeSH
|a Triticum: drug effects
650 _ 2 |2 MeSH
|a Triticum: metabolism
650 _ 7 |0 0
|2 NLM Chemicals
|a Nucleotides
650 _ 7 |0 7782-44-7
|2 NLM Chemicals
|a Oxygen
650 _ 7 |a J
|2 WoSType
700 1 _ |a Roeb, G. W.
|b 1
|u FZJ
|0 P:(DE-Juel1)129390
700 1 _ |a Dautzenberg, M.
|b 2
|u FZJ
|0 P:(DE-Juel1)129307
700 1 _ |a Fröhlich, A.
|b 3
|0 P:(DE-HGF)0
700 1 _ |a Vigeolas, H.
|b 4
|0 P:(DE-HGF)0
700 1 _ |a Minchin, P. R.
|b 5
|u FZJ
|0 P:(DE-Juel1)VDB30117
700 1 _ |a Geigenberger, P.
|b 6
|0 P:(DE-HGF)0
773 _ _ |a 10.1104/pp.104.040980
|g Vol. 135, p. 1809 - 1821
|p 1809 - 1821
|q 135<1809 - 1821
|0 PERI:(DE-600)2004346-6
|t Plant physiology
|v 135
|y 2004
|x 0032-0889
856 7 _ |2 Pubmed Central
|u http://www.ncbi.nlm.nih.gov/pmc/articles/PMC519092
909 C O |o oai:juser.fz-juelich.de:35010
|p VDB
913 1 _ |k U01
|v Chemie und Dynamik der Geo-Biosphäre
|l Chemie und Dynamik der Geo-Biosphäre
|b Environment (Umwelt)
|0 G:(DE-Juel1)FUEK257
|x 0
914 1 _ |y 2004
915 _ _ |0 StatID:(DE-HGF)0010
|a JCR/ISI refereed
920 1 _ |k ICG-III
|l Phytosphäre
|d 31.12.2006
|g ICG
|0 I:(DE-Juel1)VDB49
|x 0
970 _ _ |a VDB:(DE-Juel1)41466
980 _ _ |a VDB
980 _ _ |a ConvertedRecord
980 _ _ |a journal
980 _ _ |a I:(DE-Juel1)IBG-2-20101118
980 _ _ |a UNRESTRICTED
981 _ _ |a I:(DE-Juel1)IBG-2-20101118
981 _ _ |a I:(DE-Juel1)ICG-3-20090406

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