PMID- 16411942
OWN - NLM
STAT- MEDLINE
DCOM- 20060302
LR  - 20200930
IS  - 0028-646X (Print)
IS  - 0028-646X (Linking)
VI  - 169
IP  - 2
DP  - 2006
TI  - Routes of pyruvate synthesis in phosphorus-deficient lupin roots and nodules.
PG  - 399-408
AB  - 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 influence 
      PEPc activities or levels of malate-derived pyruvate. These results indicate that 
      nodules were more efficient 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.
FAU - Le Roux, M R
AU  - Le Roux MR
AD  - Department of Environmental Sciences, Applied Sciences Faculty, Cape Peninsula 
      University of Technology, PO Box 652, Cape Town SA-8000, South Africa.
FAU - Ward, C L
AU  - Ward CL
FAU - Botha, F C
AU  - Botha FC
FAU - Valentine, A J
AU  - Valentine AJ
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - New Phytol
JT  - The New phytologist
JID - 9882884
RN  - 0 (Carbon Radioisotopes)
RN  - 0 (Malates)
RN  - 0 (Pyruvates)
RN  - 27YLU75U4W (Phosphorus)
RN  - 415SHH325A (Adenosine Monophosphate)
RN  - 817L1N4CKP (malic acid)
SB  - IM
MH  - Adenosine Monophosphate/metabolism
MH  - Carbon Radioisotopes
MH  - Lupinus/*metabolism/microbiology
MH  - Malates/metabolism
MH  - Phosphorus/*deficiency/metabolism
MH  - Plant Roots/*metabolism/microbiology
MH  - Pyruvates/*metabolism
EDAT- 2006/01/18 09:00
MHDA- 2006/03/03 09:00
CRDT- 2006/01/18 09:00
PHST- 2006/01/18 09:00 [pubmed]
PHST- 2006/03/03 09:00 [medline]
PHST- 2006/01/18 09:00 [entrez]
AID - NPH1594 [pii]
AID - 10.1111/j.1469-8137.2005.01594.x [doi]
PST - ppublish
SO  - New Phytol. 2006;169(2):399-408. doi: 10.1111/j.1469-8137.2005.01594.x.