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The external mycorrhizal mycelium - growth and interactions with saprophytic microorganisms

Olsson, Pål Axel LU (1998)
Abstract (Swedish)
Popular Abstract in Swedish

Mykorrhiza är symbiosen mellan växters rötter och olika svampar. När en symbios har etablerats i en rot växer svampens mycel ut i marken och tar där upp näring som levereras till växten. I denna avhandling studerades hur man kan mäta detta mycel i marken med hjälp av biokemiska markörer. Vidare studerades hur detta myces påverkar övriga mikroorganismer i marken.
Abstract
The interactions between external mycorrhizal mycelia and saprophytic microorganisms were studied in experiments with growth chambers specially designed to enable the mycelia to develop in root-free soil compartments. The growth of the mycorrhizal mycelia was estimated by use of biochemical signature compounds.



It was shown possible to estimate the biomass of the external mycelium of different arbuscular mycorrhizal fungi by use of the signature fatty acid 16:1w5 in soil and sand. The amount of this fatty acid was estimated as indicator both of phospholipids (PLFAs) and neutral lipids (NLFAs). The results indicated that PLFAs reflect mycelium on the AM fungi and NLFAs storage structures.No effects of the AM mycelium on... (More)
The interactions between external mycorrhizal mycelia and saprophytic microorganisms were studied in experiments with growth chambers specially designed to enable the mycelia to develop in root-free soil compartments. The growth of the mycorrhizal mycelia was estimated by use of biochemical signature compounds.



It was shown possible to estimate the biomass of the external mycelium of different arbuscular mycorrhizal fungi by use of the signature fatty acid 16:1w5 in soil and sand. The amount of this fatty acid was estimated as indicator both of phospholipids (PLFAs) and neutral lipids (NLFAs). The results indicated that PLFAs reflect mycelium on the AM fungi and NLFAs storage structures.No effects of the AM mycelium on the bacterial community were recorded in an agricultural soil, even though the AM mycelium constituted a large part of the biomass. In a study involving calcareous dune sand, the growth on the external AM mycelium decreased the amount of PLFA 18:2w6,9, indicating negative effects on growth of saprophytic fungi.



Ectomycorrhizal mycelia of six different species reduced bacterial activity, estimated as thymidine incorporation, in experiments with a sandy soil. In these experiments no negative effect on bacterial biomass was observed. In a study on pines growing for eight months in a peat/sand mixture, both bacterial activity and biomass were lowered due to mycorrhizal inoculation. However, in the soils to which primary minerals as apatite and biotite had been added, the growth of Suillus variegatus increased bacterial activity. This demonstrated that, under certain, circumstances, ectomycorrhizal fungi may contribute to a significant carbon input to the soil which stimulates bacterial growth. (Less)
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author
opponent
  • Prof Fitter, A. H., Univ. York, England
organization
publishing date
type
Thesis
publication status
published
subject
keywords
bacteriology, Microbiology, Fatty acids, Mycorrhiza, Bacteria, virology, mycology, Mikrobiologi, bakteriologi, virologi, mykologi
pages
99 pages
publisher
Microbial Ecology, Lund University
defense location
Ecology Building, Lund University
defense date
1998-01-29 10:15
external identifiers
  • other:ISRN: SE-LUNBDS-98/1010
ISBN
91-7105-091-4
language
English
LU publication?
yes
id
b8e07497-ad9d-4aad-93bc-564f4de57e8b (old id 38350)
date added to LUP
2007-07-31 14:39:45
date last changed
2016-09-19 08:45:02
@phdthesis{b8e07497-ad9d-4aad-93bc-564f4de57e8b,
  abstract     = {The interactions between external mycorrhizal mycelia and saprophytic microorganisms were studied in experiments with growth chambers specially designed to enable the mycelia to develop in root-free soil compartments. The growth of the mycorrhizal mycelia was estimated by use of biochemical signature compounds.<br/><br>
<br/><br>
It was shown possible to estimate the biomass of the external mycelium of different arbuscular mycorrhizal fungi by use of the signature fatty acid 16:1w5 in soil and sand. The amount of this fatty acid was estimated as indicator both of phospholipids (PLFAs) and neutral lipids (NLFAs). The results indicated that PLFAs reflect mycelium on the AM fungi and NLFAs storage structures.No effects of the AM mycelium on the bacterial community were recorded in an agricultural soil, even though the AM mycelium constituted a large part of the biomass. In a study involving calcareous dune sand, the growth on the external AM mycelium decreased the amount of PLFA 18:2w6,9, indicating negative effects on growth of saprophytic fungi.<br/><br>
<br/><br>
Ectomycorrhizal mycelia of six different species reduced bacterial activity, estimated as thymidine incorporation, in experiments with a sandy soil. In these experiments no negative effect on bacterial biomass was observed. In a study on pines growing for eight months in a peat/sand mixture, both bacterial activity and biomass were lowered due to mycorrhizal inoculation. However, in the soils to which primary minerals as apatite and biotite had been added, the growth of Suillus variegatus increased bacterial activity. This demonstrated that, under certain, circumstances, ectomycorrhizal fungi may contribute to a significant carbon input to the soil which stimulates bacterial growth.},
  author       = {Olsson, Pål Axel},
  isbn         = {91-7105-091-4},
  keyword      = {bacteriology,Microbiology,Fatty acids,Mycorrhiza,Bacteria,virology,mycology,Mikrobiologi,bakteriologi,virologi,mykologi},
  language     = {eng},
  pages        = {99},
  publisher    = {Microbial Ecology, Lund University},
  school       = {Lund University},
  title        = {The external mycorrhizal mycelium - growth and interactions with saprophytic microorganisms},
  year         = {1998},
}