Enzyme activity involved in glucose phosphorylation in two arbuscular mycorrhizal fungi: indication that polyP is not the main phosphagen

Enzyme activity involved in glucose phosphorylation, the first step of glycolysis and the pentose phosphate pathway (PPP), in the spores, extra- and intraradical hyphae of Glomus etunicatum and G. coronatum was measured to clarify the role of polyphosphate as a phosphagen. Hexokinase, which utilizes...

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Bibliographic Details
Published in:Soil biology & biochemistry 2001-07, Vol.33 (9), p.1279-1281
Main Authors: Ezawa, T., Smith, S.E., Smith, F.A.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Arbuscular mycorrhizal fungi
Biological and medical sciences
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Glomus coronatum
Glomus etunicatum
Glucose
Hexokinase
Parasitism and symbiosis
pentose phosphate
phosphagen
Plant physiology and development
Polyphosphate
Polyphosphateglucokinase
Symbiosis
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
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Summary:Enzyme activity involved in glucose phosphorylation, the first step of glycolysis and the pentose phosphate pathway (PPP), in the spores, extra- and intraradical hyphae of Glomus etunicatum and G. coronatum was measured to clarify the role of polyphosphate as a phosphagen. Hexokinase, which utilizes ATP as a phosphagen was active in the all components of both fungi, suggesting that glucose can be metabolized generally through glycolysis/PPP. Polyphosphateglucokinase-type activity, in which polyphosphate is utilized as a phosphagen, was detectable in the spores and intraradical hyphae of both fungi but negligible compared with that of hexokinase. Hexokinase and polyphosphateglucokinase-type activities were characterized and it seems likely that the apparent polyphosphateglucokinase activity can be attributed to broad substrate specificity of the hexokinase.
ISSN:0038-0717
1879-3428
DOI:10.1016/S0038-0717(01)00007-4