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Utilization of organic nitrogen by ectomycorrhizal fungi (Hebeloma spp.) of arctic and temperate origin

Published online by Cambridge University Press:  01 December 1998

M. TIBBETT ,
F. E. SANDERS ,
S. J. MINTO ,
M. DOWELL  and
J. W. G. CAIRNEY
M. TIBBETT
Affiliation:
Department of Biology, University of Leeds, Leeds, LS2 9JT, U.K.
F. E. SANDERS
Affiliation:
Department of Biology, University of Leeds, Leeds, LS2 9JT, U.K.
S. J. MINTO
Affiliation:
Department of Biology, University of Leeds, Leeds, LS2 9JT, U.K.
M. DOWELL
Affiliation:
Department of Biology, University of Leeds, Leeds, LS2 9JT, U.K.
J. W. G. CAIRNEY
Affiliation:
Department of Biological Sciences, University of Western Sydney, Nepean, PO Box 10, Kingswood, NSW 2747, Australia
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Abstract

Arctic and temperate strains of Hebeloma spp. were grown in axenic culture on glutamic acid, alanine, lysine and NH4+ as sole sources of nitrogen (N), with excess carbon (C) or deficient C (supplied as glucose). Their ability to utilize seed protein as a natural N source was also assessed. All strains tested had the capacity to assimilate amino acids and generally utilized alanine and glutamic acid more readily than NH4+. Some strains were able to utilize amino C when starved of glucose C, and could mineralize amino-N to NH3-N. Arctic strains, in particular, appeared to be pre-adapted to the utilization of seed protein N and glutamic acid N, which is often liberated in high concentrations after soil freezing. The results are discussed in relation to their possible ecological importance.

Type
Research Article
Information
Mycological Research , Volume 102 , Issue 12 , December 1998 , pp. 1525 - 1532
Copyright
© The British Mycological Society 1998

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