ECTOMYCORRHIZA FORMATION IN EUCALYPTUS

II. THE ULTRASTRUCTURE OF COMPATIBLE AND INCOMPATIBLE MYCORRHIZAL FUNGI AND ASSOCIATED ROOTS

Authors

  • N. MALAJCZUK,

    1. Division of Forest Research, CSIRO, Private Bag, P.O., Wembley, Western Australia, 6014
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  • R. MOLINA,

    1. US Department of Agriculture and Forest Service, Pacific Northwest Forest and Range Experimental Station, Forestry Science Laboratory, Corvallis, Oregon, USA 97331
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  • J. M. TRAPPE

    1. US Department of Agriculture and Forest Service, Pacific Northwest Forest and Range Experimental Station, Forestry Science Laboratory, Corvallis, Oregon, USA 97331
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Summary

Ultrastmcture of Eucalyptus ectomycorrhizas initiated by compatible, host-specific fungi and by broad-host range fungi was compared with that of roots inoculated with incompatible, conifer-specific ectomycorrhizal fungi. The results indicate little difference in morphology between ectomycorrhizas formed by compatible, host-specific fungi and those formed by broad-host-range fungi. However, interaction between eucalypt roots and incompatible fungus species known to be conifer-specific induced either deposition of tannins in root tissue or, in the case of the Pseudotsuga-speciiic Suillus lakei, a characteristic hypersensitive reaction which resulted in lysis of hyphae and of epidermal and outer cortical cells of roots.

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