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The Roles of Bacteria and Fungi in Plant Nutrition02:11

The Roles of Bacteria and Fungi in Plant Nutrition

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Related Experiment Video

Updated: Jul 19, 2026

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores
09:17

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Published on: March 26, 2019

Population, habitat and genetic correlates of mycorrhizal specialization in the 'cheating' orchids corallorhiza

Lee Taylor D, Bruns

    Molecular Ecology
    |December 3, 1999
    PubMed
    Summary

    Nonphotosynthetic orchids show specialized mycorrhizal fungi associations. Geographic location and plant genetics significantly influence these fungal partnerships, creating a mosaic of interactions.

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    Published on: May 17, 2022

    Area of Science:

    • Plant-Fungal Interactions
    • Mycorrhizal Symbiosis
    • Nonphotosynthetic Plants

    Background:

    • Nonphotosynthetic plants rely on mycorrhizal fungi for nutrition.
    • Geographic and environmental influences on plant-fungal specialization are poorly understood.

    Purpose of the Study:

    • Investigate geographic and environmental factors shaping mycorrhizal specialization in orchids.
    • Determine the role of plant genetics in host-fungus specificity.

    Main Methods:

    • Amplified fungal internal transcribed spacer (ITS) fragments from orchid mycorrhizae.
    • Used ITS restriction fragment length polymorphisms (RFLPs) to identify fungal species.
    • Analyzed fungal diversity and distribution across orchid populations.

    Main Results:

    • Identified 20 fungal species for Corallorhiza maculata and 3 for C. mertensiana, all within Russulaceae.
    • Observed significant geographic structuring of fungal communities in both orchid species (48-68% variance).
    • Found habitat and phenotype strongly influenced fungal associations in C. maculata, while geography was key for C. mertensiana.

    Conclusions:

    • Mycorrhizal specialization in nonphotosynthetic orchids is influenced by geography and host plant genetics.
    • Distinct orchid species and even variants within a species exhibit unique fungal partnerships.
    • Demonstrated fine-scale genetic control and geographical mosaicism in plant-fungal interactions.