Effect of organic and inorganic nitrogen sources on endogenous polyamines and growth of ectomycorrhizal fungi in pure culture |
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Authors: | Tytti Sarjala |
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Institution: | (1) Finnish Forest Research Institute, Parkano Research Station, Kaironiementie 54, FIN-39700 Parkano, Finland e-mail: tytti.sarjala@metla.fi, Fax: +358–3-4435200, FI |
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Abstract: | The abilities of three ectomycorrhizal fungi, Paxillus involutus, Suillus
variegatus and Lactarius rufus, to utilize organic and inorganic nitrogen sources were determined by measuring the growth and endogenous free polyamines
(putrescine, spermidine and spermine) of pure culture mycelium. Differences were found in the utilization of the nitrogen
sources and in the polyamine concentrations between the fungal species and between isolates of L. rufus. All the fungi grew well on ammonium and on several amino acids. Endogenous polyamine levels varied with the nitrogen source.
Spermidine was commonly the most abundant polyamine; however, more putrescine than spermidine was found in P. involutus growing on inorganic nitrogen or arginine. Low amounts of spermine were found in S. variegatus and some samples of L. rufus. None or only a trace of spermine was found in P. involutus mycelium. In all fungi, putrescine concentrations were higher with ammonium than with the nitrate treatment. The total nitrogen
content of peat did not determine the ability of L. rufus strains isolated from peatland forest sites to utilize organic nitrogen.
Accepted: 27 November 1998 |
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Keywords: | Ectomycorrhiza Nitrogen Putrescine Spermidine Spermine |
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