| 1. |
- Arnebrant, Kristina, et al.
(författare)
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The influence of nitrogen-fertilization on ectomycorrhizal mycelial colonization and infection
- 1990
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Ingår i: Agriculture, Ecosystems & Environment. - 1873-2305. ; 28:1-4, s. 21-25
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Tidskriftsartikel (refereegranskat)abstract
- Total ectomycorrhizal infection level and the composition of individual infection types were investigated in young Pinus sylvestris seedlings planted in a mature Scots pine forest in southern Sweden, which was N-fertilized 13 years ago. Total ectomycorrhizal infection frequency, approximately 85%, did not differ between the fertilized and non-fertilized plots, but the infection types differed between the treatments. The different fertilizers, NH4NO3 and urea, influenced the composition of ectomycorrhizal types in different ways. There were also differences in ectomycorrhiza type composition between seedlings grown in the field and seedlings grown in soil brought into the lab.
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| 2. |
- Erland, Susanne, et al.
(författare)
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The effects of liming on mycelial colonization and carbon allocation in ectomycorrhizal mycelia attached to Pinus silvestris plants
- 1990
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Ingår i: Agriculture, Ecosystems & Environment. - 1873-2305. ; 28:1-4, s. 111-114
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Tidskriftsartikel (refereegranskat)abstract
- The effects of liming on ectomycorrhizal mycelial colonization and carbon allocation were assessed using Pinus silvestris plants grown in association with an ectomycorrhizal fungus. Plants were placed in perspex growth chambers divided by a central partition so that soils of different pH could be used on either side of the chambers. Differences between the growth form and growth rates of the fungi and allocation of plant assimilate were determined at different pH values.
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| 3. |
- Finlay, R.D., et al.
(författare)
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Mycelial uptake, translocation and assimilation of N-15-labeled nitrogen by ectomycorrhizal Pinus sylvestris plants
- 1990
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Ingår i: Agriculture, Ecosystems & Environment. - 1873-2305. ; 28:1-4, s. 133-137
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Tidskriftsartikel (refereegranskat)abstract
- Mycolial uptake, translocation and assimilation of 15N-labelled ammonium was followed in Pinus sylvestris plants infected with the ectomycorrhizal fungus. Paxillus involutus. The distribution of labelled compounds within the systems was examined using gas chromatography / mass spectrometry. Labelled nitrogen was incorporated into a range of free amino acids in the fungal mycelium, the principal sinks being alanine and glutamatelglutamine. Levels of 15 N enrichment declined throughout the transport pathway from 30-45% in the mycelium a~d mycorrhlzal root lips to 3-11% in the plant shoots. A significant proportion of the total assimilated nitrogen (27%) was incorporated into proteinaceous material and the proportion of label present in this fraction increased from 27% in the mycelium to 32% and 58% in the plant roots and needles respectively. The protein-incorporated amino acids showed a wider spectrum of labelling with significant amounts of 15N incorporated into valine, isoleucine, phenylalanine and lysine.
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