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    Mycorrhiza development in trees for revegetation of eroded mountain slopes

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    Author
    Wills, B. J.
    Date
    1978
    Permanent Link
    http://hdl.handle.net/10092/5731
    Thesis Discipline
    Botany
    Degree Grantor
    University of Canterbury
    Degree Level
    Doctoral
    Degree Name
    Doctor of Philosophy

    The ectomycorrhizal association between Mountain Pine (Pinus mugo) and the fungus Suillus luteus has been studied in an attempt to promote establishment and growth of trees on high altitude revegetation sites. In vitro growth studies of S. luteus showed it was capable of growing at low phosphorus levels and utilising a variety of carbohydrate substrates. A number of organic acids, components of root exudates, stimulated fungal growth. Basidiospores have the greatest potential for pine seed inoculation. Investigation of the viability, storage and germination of these spores revealed that frozen or cool stored spores and freeze dried hymenial tissue were the best forms of inocula. Basidiospore viability was best determined by acridine orange staining with fluorescence microscopy. Nicotinic acid and inositol stimulated spore germination although germination levels were always low. Large numbers of basidiospores were necessary to obtain good mycorrhiza formation on seedlings and the inocula lost effectiveness with long storage periods. A scanning electron microscope study of the mycorrhizal infection process showed the presence of novel 'vesicular bodies', closely associated with the Hartig net. Granulated seeds containing a basidiospore inoculum were prepared and seedlings developing from these possessed low levels of mycorrhizas.

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    • Science: Theses and Dissertations [3299]
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