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    On the contributions of photorespiration and compartmentation to the contrasting intramolecular2H profiles of C3and C4plant sugars

    Access Status
    Fulltext not available
    Authors
    Zhou, Y.
    Zhang, B.
    Stuart-Williams, H.
    Grice, Kliti
    Hocart, C.
    Gessler, A.
    Kayler, Z.
    Farquhar, G.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhou, Y. and Zhang, B. and Stuart-Williams, H. and Grice, K. and Hocart, C. and Gessler, A. and Kayler, Z. et al. 2018. On the contributions of photorespiration and compartmentation to the contrasting intramolecular2H profiles of C3and C4plant sugars. Phytochemistry. 145: pp. 197-206.
    Source Title
    Phytochemistry
    DOI
    10.1016/j.phytochem.2017.11.004
    ISSN
    0031-9422
    School
    Department of Chemistry
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP130100577
    URI
    http://hdl.handle.net/20.500.11937/63197
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier Ltd Compartmentation of C 4 photosynthetic biochemistry into bundle sheath (BS) and mesophyll (M) cells, and photorespiration in C 3 plants is predicted to have hydrogen isotopic consequences for metabolites at both molecular and site-specific levels. Molecular-level evidence was recently reported (Zhou et al., 2016), but evidence at the site-specific level is still lacking. We propose that such evidence exists in the contrasting 2 H distribution profiles of glucose samples from naturally grown C 3 , C 4 and CAM plants: photorespiration contributes to the relative 2 H enrichment in H 5 and relative 2 H depletion in H 1 & H 6 (the average of the two pro-chiral Hs and in particular H 6, pro-R ) in C 3 glucose, while 2 H-enriched C 3 mesophyll cellular (chloroplastic) water most likely contributes to the enrichment at H 4 ; export of (transferable hydrogen atoms of) NADPH from C 4 mesophyll cells to bundle sheath cells (via the malate shuttle) and incorporation of 2 H-relatively unenriched BS cellular water contribute to the relative depletion of H 4 & H 5 respectively; shuttling of triose-phosphates (PGA: phosphoglycerate dand DHAP: dihydroacetone phosphate) between C 4 bundle sheath and mesophyll cells contributes to the relative enrichment in H 1 & H 6 (in particular H 6, pro-R ) in C 4 glucose.

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