Suppression of the biocontrol agent Trichoderma harzianum by mycelium of the arbuscular mycorrhizal fungus Glomus intraradices in root-free soil

Article Abstract:

The antagonistic fungus Trichoderma harzianum does not affect growth and phosphorus uptake by the external mycelium of Glomus intraradices. In contrast, it is G intraradices which adversely affects T. harzianum. These were gleaned from an investigation of the interaction between G intraradices and T harzianum in soil and how such interaction affects growth and activity. Direct interference from roots was avoided with the use of a compartmented growth system with root-free soil compartments. Results showed that the presence of T harzianum does not reduce living hyphal biomass andhyphal (super 33)P transport but the presence of external mycelium of G intraradices hindered T harzianum population development and beta-glucuronidase activity.

Bacteria, Phytopathogenic, Phytopathogenic bacteria, Molds (Fungi)

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Phosphorus effects on the mycelium and storage structures of an arbuscular mycorrhizal fungus as studied in the soil and roots by analysis of fatty acid signatures

Article Abstract:

Microbiological research using fatty acid signature 16:1omega5 analysis shows that soil phosphorus levels affect the distribution of the arbuscular mycorrhizal fungus in root systems. Neutral lipid fatty acid 16:1omega5 levels are roughly equivalent to spore numbers. Phospholipid fatty acid 16:1omega5 levels equate to hyphal length. Evidence suggests that storage structures use less carbon at high phosphate levels.

Roots (Botany)

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Phylogenetic characterization and in situ detection of a Cytophaga-Flexibacter-Bacteroides phylogroup bacterium in Tuber borchii Vittad. ectomycorrhizal mycelium

Article Abstract:

Researchers have discovered a bacterium belonging to the Cytophaga-Flexibacter-Bacteroides phylogroup that is associated with the mycelium of the mycorrhizal fungus Tuber borchii Vittad. This bacterium has not been previously described.

Host-bacteria relationships

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