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- W3081020436 abstract "Feeding 14CO2 was crucial to uncovering the path of carbon in photosynthesis. Feeding 13CO2 to photosynthesizing leaves emitting isoprene has been used to develop hypotheses about the sources of carbon for the methylerythritol 4-phosphate pathway, which makes the precursors for terpene synthesis in chloroplasts and bacteria. Both photosynthesis and isoprene studies found that products label very quickly (<10 min) up to 80–90% but the last 10–20% of labeling requires hours indicating a source of 12C during photosynthesis and isoprene emission. Furthermore, studies with isoprene showed that the proportion of slow label could vary significantly. This was interpreted as a variable contribution of carbon from sources other than the Calvin–Benson cycle (CBC) feeding the methylerythritol 4-phosphate pathway. Here, we measured the degree of label in isoprene and photosynthetic metabolites 20 min after beginning to feed 13CO2. Isoprene labeling was the same as labeling of photosynthesis intermediates. High temperature reduced the label in isoprene and photosynthesis intermediates by the same amount indicating no role for alternative carbon sources for isoprene. A model assuming glucose, fructose, and/or sucrose reenters the CBC as ribulose 5-phosphate through a cytosolic shunt involving glucose 6-phosphate dehydrogenase was consistent with the observations." @default.
- W3081020436 created "2020-09-01" @default.
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- W3081020436 creator A5091530401 @default.
- W3081020436 date "2020-09-10" @default.
- W3081020436 modified "2023-10-16" @default.
- W3081020436 title "Source of 12C in Calvin–Benson cycle intermediates and isoprene emitted from plant leaves fed with 13CO2" @default.
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- W3081020436 doi "https://doi.org/10.1042/bcj20200480" @default.
- W3081020436 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7666771" @default.
- W3081020436 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32815532" @default.
- W3081020436 hasPublicationYear "2020" @default.
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