Pyrophosphate Dependent Sugar Metabolism in Mycorrhizal Tree Roots

S. S. Sung, D. P. Xu, L. Mustárdy, P. P. Kormanik, C. C. Black

Research output: Contribution to journalArticle

Abstract

Abstract: Trees exhibit alternative enzymes for sugar metabolism particularly at steps in glycolysis and gluconeogenesis involving pyrophosphate (PPi). But these activities seem to be independent of root mycorrhizal infection and of soil phosphorus levels. PPi serves as an energy source with certain enzymes, specifically with the PPi-dependent phosphofructokinase (PFK), even better than ATP. Hence PPi is a new energy source in tree metabolism. We earlier established the presence of fructose 2,6-biphosphate (Fru 2,6-P2) in trees and here demonstrate that Fru 2,6-P2 regulates the tree root PPi-PFK. Fru 216-P2 also activates the breakdown of sucrose in tree sink tissues such as roots or terminal buds. Sucrose breakdown via the sucrose synthase pathway is dependent upon PPi and it is strongly activated by Fru2,6-P2 in sucrose sink tissues such as tree roots.

Original languageEnglish
Pages (from-to)99-108
Number of pages10
JournalDevelopments in Soil Science
Volume18
Issue numberC
DOIs
Publication statusPublished - 1989

Fingerprint

pyrophosphates
Metabolism
Sugars
Sucrose
Phosphofructokinases
sugar
metabolism
sugars
sucrose
Tissue
phosphofructokinases
Enzymes
Phosphorus
Adenosine Triphosphate
enzyme
Soils
sucrose synthase
gluconeogenesis
energy
glycolysis

ASJC Scopus subject areas

  • Soil Science
  • Environmental Chemistry
  • Earth-Surface Processes

Cite this

Pyrophosphate Dependent Sugar Metabolism in Mycorrhizal Tree Roots. / Sung, S. S.; Xu, D. P.; Mustárdy, L.; Kormanik, P. P.; Black, C. C.

In: Developments in Soil Science, Vol. 18, No. C, 1989, p. 99-108.

Research output: Contribution to journalArticle

Sung, S. S. ; Xu, D. P. ; Mustárdy, L. ; Kormanik, P. P. ; Black, C. C. / Pyrophosphate Dependent Sugar Metabolism in Mycorrhizal Tree Roots. In: Developments in Soil Science. 1989 ; Vol. 18, No. C. pp. 99-108.
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