Location and survival of mycorrhiza helper Pseudomonas fluorescens during establishment of ectomycorrhizal symbiosis between Laccaria bicolor and Douglas Fir

Article Abstract:

The mycorrhiza helper bacterium Pseudomonas fluorescens BBc6R8 promotes ectomycorrhizal symbiosis between Laccaria bicolor and Douglas fir. The bacterium population declines rapidly in the soil and the rhizosphere, and is below the detection limit after 19 wk. The formation of the L. bicolor sporocarps in autumn and resumption of the growth of the Douglas fir roots in spring fails to increase the BBc6R8 population. The bacterium shows a significant mycorrhiza helper effect even at a low level of 30 CFU/gram of dry matter in the soil.

Research, Symbiosis, Pseudomonas fluorescens, Douglas fir

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Mechanisms for the development of genetically variable mycorrhizal mycelia in the ectomycorrhizal fungus Laccaria bicolor

Article Abstract:

Strains of the fungus Laccaria (L.) bicolor with different genetic genotypes may occupy the roots of the same plant. Researchers innoculated seedlings of jack pine with L. bicolor of various genotypes. Levels of growth and mycorrhization varied in relation to the genotype of the L. bicolor. Furthermore, L. bicolor of various genotypes grew on the roots of the plants. Such genetic variation may make the fungus and its hosts adaptable to different soils.

Genetic aspects, Molds (Fungi)

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In Situ identification of intracellular bacteria related to Paenibacillus spp. in the Mycelium of the ectomycorrhizal fungus Laccaria bicolor S238N

Article Abstract:

Research reveals the presence of intracellular bacteria in the subcultures of the ectomycorrhizal fungus, Laccaria bicolor S238N. The intracellular bacteria are 0.5 micrometer in diameter, rare, and homogeneously distributed in the mycelium. The bacteria are identifed as Paenibacillus spp. by a 16S rRNA-directed oligonucleotide probe.

Germany, France, Physiological aspects, Bacteria, Identification and classification, RNA, Cell proliferation, Endosymbiosis, Mycelium

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