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• W2894471197 endingPage "1852" @default.
• W2894471197 startingPage "1843" @default.
• W2894471197 abstract "Phosphenolpyruvate carboxylase (PEPC)-catalysed fixation of bicarbonate to C4 acids is commonly believed to represent a rather small flux in illuminated leaves. In addition, its potential variation with O2 and CO2 is not documented and thus is usually neglected in gas-exchange studies. Here, we used quantitative NMR analysis of sunflower leaves labelled with 13 CO2 (99% 13 C) under controlled conditions and measured the amount of 13 C found in the four C-atom positions in malate, the major product of PEPC activity. We found that amongst malate 13 C-isotopomers present after labelling, most molecules were labelled at both C-1 and C-4, showing the incorporation of 13 C at C-4 by PEPC fixation and subsequent redistribution to C-1 by fumarase (malate-fumarate equilibrium). In addition, absolute quantification of 13 C content showed that PEPC fixation increased at low CO2 or high O2 , and represented up to 1.8 μmol m-2 s-1 , that is, 40% of net assimilation measured by gas exchange under high O2 /CO2 conditions. Our results show that PEPC fixation represents a quantitatively important CO2 -fixing activity that varies with O2 and/or CO2 mole fraction and this challenges the common interpretation of net assimilation in C3 plants, where PEPC activity is often disregarded or considered to be constant at a very low rate." @default.
• W2894471197 created "2018-10-05" @default.
• W2894471197 creator A5011667102 @default.
• W2894471197 creator A5089546911 @default.
• W2894471197 date "2018-10-24" @default.
• W2894471197 modified "2023-10-11" @default.
• W2894471197 title "<i>In vivo</i> phospho<i>enol</i>pyruvate carboxylase activity is controlled by <scp>CO</scp>₂ and O₂ mole fractions and represents a major flux at high photorespiration rates" @default.
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• W2894471197 doi "https://doi.org/10.1111/nph.15500" @default.
• W2894471197 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30267568" @default.
• W2894471197 hasPublicationYear "2018" @default.
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