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- Title
COMBINED EFFECT OF AN ARBUSCULAR MYCORRHIZAL FUNGUS AND A BIOCONTROL BACTERIUM AGAINST PYTHIUM ULTIMUM IN SOIL.
- Authors
Larsen, John; Ravnskov, Sabine; Jakobsen, Iver
- Abstract
The combined effect of the arbuscular mycorrhizal (AM) fungus Glomus intraradices and the bacterium Burkholderia cepacia on Pythium ultimum was studied in a growth system with root-free soil compartments allowing examination of microbial interactions without direct interference from roots. Signature fatty acids were used to quantify individual microbial populations. Biomass and amount of energy reserves were estimated using specific phospholipid fatty acids (PLFA) and neutral lipid fatty acids (NLFA), respectively. Population density of P. ultimum was estimated by colony forming units on selective media. Both biocontrol agents (BCAs) reduced population density of P. ultimum. Biomass of B. cepacia measured using signature fatty acids was inhibited by the presence of mycelium of G. intraradices, which might explain why no additive effect on P. ultimum was found when combining the two BCAs. In conclusion, combining G. intraradices and B. cepacia did not enhance the biocontrol efficacy against P. ultimum.
- Subjects
MYCORRHIZAL fungi; SOIL fungi; PYTHIUM ultimum; GLOMUS intraradices; FATTY acids; PATHOGENIC microorganisms
- Publication
Folia Geobotanica, 2003, Vol 38, Issue 2, p145
- ISSN
1211-9520
- Publication type
Article
- DOI
10.1007/BF02803147