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- W115706371 abstract "The root disease fungus Inonotus tomentosus, common in the oldgrowth boreal forests of British Columbia, poses a threat to thehealth of second growth forests established on sites with a previoushistory of root disease. Colonized stumps occur in groups of 1 to 6;the groups are clumped within a clearcut. Therefore, surveys fordisease incidence need to employ wide (10 m) transects and cover atleast 10% of the stand area.The fungus remains viable in stumps for at least 30 years andcan infect roots of regeneration trees in contact with stump roots.Spruce stump roots cause twice as many infections as pine stump rootsbecause more spruce roots are colonized, they are longer, and theyare horizontally oriented. Trees growing within 200 cm of diseasedspruce stumps have a 25% chance of infection. At 350 cm - 400 cm thechance of infection is 10%. Trees growing within 50 cm and 250 cm300 cm of diseased pine stumps have a 25% and 10% chance of infectionrespectively.Within a stand, disease centres are usually small (less than 5trees) and composed of a single genotype. Larger centres consist ofseveral genotypes. Electrophoretic protein profiles and vegetativecompatibility tests were co-supportive methods used to determinegenotype similarities. The clumped distribution of disease centresand the frequency of unique genotypes suggest that spores may have animportant role in disease spread.Infection of roots by I. tomentosus occurs through directpenetration of the bark of small roots, or by infection of a feederroot. In roots approximately 5 cm diameter or less, the fungus grewin or on the bark and often preceded decay in the wood. In largerroots fungal growth is in the heartwood; radial growth to the bark islimited until root death.Inoculations of mature spruce and pine trees suggest that spruceis more readily infected than pine, due in part to greater resinproduction and phenol accumulation by challenged pine roots.Infection of root wood by I. tomentosus caused host cell death at thehyphal front, increased phenolic deposition, peroxidase activity, andstarch depletion beyond the hyphal front.Inonotus circinatus (a pathogen of pine in eastern NorthAmerica) and I. tomentosus show consistent differences at the proteinlevel as indicated by protein electrophoresis and southernhybridization of a homologous probe (random genomic clone) to totalgenomic DNA. Protein patterns of I. tomentosus isolates are morevariable than patterns of I. circinatus which may be due to greaterdiversity of I. tomentosus hosts and climate." @default.
- W115706371 created "2016-06-24" @default.
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- W115706371 date "1990-04-10" @default.
- W115706371 modified "2023-09-23" @default.
- W115706371 title "Epidemiology and population biology of Inonotus tomentosus as a pathogen of forests of British Columbia" @default.
- W115706371 hasPublicationYear "1990" @default.
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