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Rapid recycling of triose phosphates in oak stem tissue |
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| Authors: | S A HILL J S WATERHOUSE E M FIELD V R SWITSUR T AP REES |
| Institution: | Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 SEA;Applied Sciences, Anglia Polvtechnic University, East Road. Cambridge CBI IPT;Sub-department of Quaternary Research, The Godwin Laboratory, Free School Lane, Cambridge CB2 3RS, UK |
| Abstract: | We report the carbon-13 and oxygen-18 isotope ratios in cellulose from the early and late wood of pedunculate oak (Quercus robur L.). The δ13 C value of the early wood correlates best with that of the late wood of the previous year. The δ18O value of the early wood correlates best with that of the late wood of the same year. We suggest that a biochemical explanation of these data is that there is a rapid cycle between hexose monophosphates and triose phosphates in oak stem tissue during cellulose synthesis. Evidence in support of this explanation is provided by the intramolecular distribution of 14C in labelled fructose extracted from cores of wood that had been supplied with 1?14C]- and 6-14C]glucose. |
| Keywords: | carbon-13 cellulose oak (Quercus robur) oxygen-18 pyrophosphate fructose-6-phosphate 1-phospho-iransferase stable isotopes triose phosphate cycling |