Seasonal fluctuations of growth and nitrogen metabolism in the ectomycorrhizal association Douglas fir-Laccaria laccata

Chalot, Michel; Botton, Bernard; Banvoy, Jacques

doi:10.1016/0167-8809(90)90014-5

Cited by 5 publications

(1 citation statement)

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“…In fungi, the activity of NADH-GDH is associated pritnarily with the degradation of glutamate, and their AlAT and aspartate aminotransferase (AsAT) activities play a dominant role in the intermediar\' metabolism of amino acids (Ahmad & Hellebust, 1991), The levels of AsAT are also found to be strongly regulated by growth conditions in mycorrhizal fungi (Chalot. Botton & Banvoy, 1989;Ahmad et al, 1990).…”

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Nitrogen metabolism in the ectomycorrhizal fungus Hebeloma crustuliniforme

et al. 1995

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SUMMARYWith glucose as the carbon source, the ectomycorrhizal basidiomycete Hebeloma crustuliniforme (Bull. ex. Amans) Quel. utilizes nitrate, ammonium and amino acids as sources of nitrogen. Inoculated as a suspension of fine hyphae in such liquid media, the fungus expands rapidly, exhibiting a distinct exponential phase with a doubling time of 1-2 d and a maximum content of mycelial protein during the first 7 d of growth. Its growth when amino acids serve as sole carbon and nitrogen source is, however, less rapid, and requires several days of induction under these conditions. In H. crustuliniforme, assimilation of ammonium appears to be carried out primarily via the NADPHglutamate dehydrogenase (GDH) pathway. Its NADPH-GDH levels in exponentially growing mycelia are several times greater than the apparent nitrogen assimilation rates of the mycelia. Its levels of glutamine synthetase activity in comparison are very small during the exponential period of growth. The greatest levels of NADH-GDH are found in glucose-grown cultures during the post-exponential period, and in glucose-free amino acidgrown cultures during the active period of growth. This suggests a catabolic role for the NADH-GDH. Aspartate aminotransferase and alanine aminotransferase in H. crustuliniforme are highly active during the exponential period of growth, and their concentrations are increased further in the presence of amino acids as sole nitrogen sources, suggesting a key role for these enzymes in interactions between pathways of amino acid metabolism and carbon metabolism in tbis fungus.

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Nitrogen metabolism in the ectomycorrhizal fungus Hebeloma crustuliniforme

et al. 1995

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Mycorrhizae: Ectomycorrhiza and Ectendomycorrhiza

Agerer

1993

Progress in Botany / Fortschritte Der Botanik

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As new class of "mycorrhizal" interactions the "lycoperdioid mycothallus interaction" (Schmid and Oberwinkler 1993) is proposed and studied in detail. It is characterized by aseptate, intracellularly regularly coiled, partly swollen hyphae, forming vesicles but no arbuscles and is formed within the gametophyte of Lycopodium clavatum. Intercellular hyphae may branch, resembling the hyphal behaviour of a Hartig net.

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2002

Mycorrhizal Symbiosis

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Seasonal fluctuations of growth and nitrogen metabolism in the ectomycorrhizal association Douglas fir-Laccaria laccata

Cited by 5 publications

References 8 publications

Nitrogen metabolism in the ectomycorrhizal fungus Hebeloma crustuliniforme

Nitrogen metabolism in the ectomycorrhizal fungus Hebeloma crustuliniforme

Mycorrhizae: Ectomycorrhiza and Ectendomycorrhiza

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