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A hypoxylon mammatum patho toxin responsible for canker formation in quaking aspen


A hypoxylon mammatum patho toxin responsible for canker formation in quaking aspen



Phytopathology 68(6): 866-872



ISSN/ISBN: 0031-949X

A toxic substance produced by the fungus H. mammatum was responsible for canker formation in quaking aspen (Populus tremuloides). Cell-free extracts of culture medium and cankered host tissue caused inhibition of wound callus formation, bark necrosis and collapse, and distal vein necrosis in aspen leaves. Twenty-three of 24 H. mammatum isolates and 2 other fungus species, Cenangium singulare and H. rubigosum, produced substances in culture that were toxic to aspen leaves. Twenty-seven plant species were tested by leaf assay for toxin sensitivity. Only P. tremuloides was highly sensitive to the H. mammatum toxin. Several other poplars [Populus spp.], 1 willow species [Salix sp.] and bur oak [Quercus macrocarpa] also gave weak positive reactions. The toxic substance has a MW of 700-1100 daltons, is heat stable, is soluble in polar solvents and can be partially purified either by gel filtration, silica gel column and TLC, or high-vaccuum sublimation.

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Accession: 004579171

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Related references

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