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Title: Routes of pyruvate synthesis in phosphorus-defi lupin roots and nodules
Authors: Le Roux, M. R 
Ward, C. L 
Botha, F. C 
Valentine, AJ 
Keywords: ATP;lupin (Lupinus angustifolius);nodules;PEPc (phosphoenolpyruvate carboxylase);phosphorus defipyruvate synthesis
Issue Date: 2005
Publisher: Wiley
Source: Le Roux, M. R., Ward, C. L., Botha, F. C. et al. 2005. Routes of pyruvate synthesis in phosphorus-defi lupin roots and nodules. New Phytologist, 169(2): 399– 408. [http://doi.10.1111/j.1469-8137.2005.01594.x]
Journal: New Phytologist 
Abstract: • Here, nodulated lupins (Lupinus angustifolius (cv Wonga)) were hydroponically grown at low phosphate (LP) or adequate phosphate (HP). • Routes of pyruvate synthesis were assessed in phosphorus (P)-starved roots and nodules, because P-starvation can enhance metabolism of phosphoenolpyruvate (PEP) via the nonadenylate-requiring PEP carboxylase (PEPc) route. Since nodules and roots may not experience the same degree of P stress, it was postulated that decreases in metabolic inorganic phosphorus (Pi) of either organ, should favour more pyruvate being synthesized from PEPc-derived malate. • Compared with HP roots, the LP roots had a 50% decline in Pi concentrations and 55% higher ADP : ATP ratios. However, LP nodules maintained constant Pi levels and unchanged ADP : ATP ratios, relative to HP nodules. The LP roots had greater PEP metabolism via PEPc and synthesized more pyruvate from PEPc-derived malate. In nodules, P supply did not infl PEPc activities or levels of malate-derived pyruvate. • These results indicate that nodules were more effi than roots in maintaining optimal metabolic Pi and adenylate levels during LP supply. This caused an increase in PEPc-derived pyruvate synthesis in LP roots, but not in LP nodules
ISSN: 0028-646X
DOI: http://doi.10.1111/j.1469-8137.2005.01594.x
Appears in Collections:Appsc - Journal Articles (DHET subsidised)

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