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Endogenous polyamine content and metabolism in the ectomycorrhizal fungus Paxillus involutus

Published online by Cambridge University Press:  01 September 1999

SILVIA FORNALÉ ,
TYTTI SARJALA  and
NELLO BAGNI
SILVIA FORNALÉ
Affiliation:
Dipartimento di Biologia Evoluzionistica Sperimentale, Università di Bologna, via Irnerio 42, 40126 Bologna, Italy
TYTTI SARJALA
Affiliation:
Finnish Forest Research Institute, Parkano Research Station, Kaironmentie 54, FIN-39700 Parkano, Finland
NELLO BAGNI
Affiliation:
Dipartimento di Biologia Evoluzionistica Sperimentale, Università di Bologna, via Irnerio 42, 40126 Bologna, Italy
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Abstract

Endogenous polyamine content of the ectomycorrhizal fungus Paxillus involutus, as well as the activity of its biosynthetic enzymes in relation to mycelia ageing were investigated in this work. Polyamines in free, PCA-soluble and insoluble conjugated forms, are present in Paxillus involutus mycelia in relatively high amounts and the ratio of putrescine to spermidine is age-dependent. Both arginine- and ornithine-decarboxylases are present, but putrescine biosynthesis proceeds mostly via ornithine decarboxylase and decreases with the age of mycelia. There was a large release of free polyamines from mycelia which showed age-dependent features. Clear polyamine uptake was observed in 2-wk-old mycelia and no competition between putrescine and cadaverine was detected. Putrescine uptake seems to reduce ornithine decarboxylase activity, but does not affect arginine decarboxylase.

Keywords

arginine decarboxylaseornithine decarboxylasePaxillus involutuspolyaminespolyamine releasepolyamine uptake
Type
Research Article
Information
The New Phytologist , Volume 143 , Issue 3 , September 1999 , pp. 581 - 587
Copyright
© Trustees of the New Phytologist 1999

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