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240404s2024 xx |||||o 00| ||eng c |
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|a 10.1111/nph.19730
|2 doi
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|a pubmed24n1416.xml
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|e rakwb
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|a eng
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| 100 |
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|a Xu, Yuan
|e verfasserin
|4 aut
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| 245 |
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|a The oxidative pentose phosphate pathway in photosynthesis
|b a tale of two shunts
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 23.05.2024
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|a Date Revised 23.05.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2024 The Authors New Phytologist © 2024 New Phytologist Foundation.
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|a CO2 release in the light (RL) and its presumed source, oxidative pentose phosphate pathways, were found to be insensitive to CO2 concentration. The oxidative pentose phosphate pathways form glucose 6-phosphate (G6P) shunts that bypass the nonoxidative pentose phosphate reactions of the Calvin-Benson cycle. Using adenosine diphosphate glucose and uridine diphosphate glucose as proxies for labeling of G6P in the stroma and cytosol respectively, it was found that only the cytosolic shunt was active. Uridine diphosphate glucose, a proxy for cytosolic G6P, and 6-phosphogluconate (6PG) were significantly less labeled than Calvin-Benson cycle intermediates in the light. But ADP glucose, a proxy for stromal G6P, is labeled to the same degree as Calvin-Benson cycle intermediates and much greater than 6PG. A metabolically inert pool of sedoheptulose bisphosphate can slowly equilibrate keeping the label in sedoheptulose lower than in other stromal metabolites. Finally, phosphorylation of fructose 6-phosphate (F6P) in the cytosol can allow some unlabeled carbon in cytosolic F6P to dilute label in phosphenolpyruvate. The results clearly show that there is oxidative pentose phosphate pathway activity in the cytosol that provides a shunt around the nonoxidative pentose phosphate pathway reactions of the Calvin-Benson cycle and is not strongly CO2-sensitive
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|a Journal Article
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|a 6‐phosphogluconate
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|a Calvin–Benson cycle
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|a Nicotiana tabacum L. ‘Samsun’
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|a increasing CO2
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|a oxidative pentose phosphate pathway
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|a photosynthetic carbon metabolism
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|a Carbon Dioxide
|2 NLM
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|a 142M471B3J
|2 NLM
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|a Glucose-6-Phosphate
|2 NLM
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| 650 |
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|a 56-73-5
|2 NLM
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| 700 |
1 |
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|a Schmiege, Stephanie C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Sharkey, Thomas D
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 242(2024), 6 vom: 02. Mai, Seite 2453-2463
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:242
|g year:2024
|g number:6
|g day:02
|g month:05
|g pages:2453-2463
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|u http://dx.doi.org/10.1111/nph.19730
|3 Volltext
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