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UBC Theses and Dissertations
Seedborne fusarium and root colonization of container-grown douglas-fir seedlings Neumann, Melody J.
Abstract
The role of seedborne Fusarium in root colonization of container-grown Douglas-fir seedlings was studied in two coastal Douglas-fir seedlots; one contaminated with Fusarium and the other with minimal Fusarium. Seedlots were treated using either a standing water imbibition, or a running water imbibition with a post-stratification hydrogen peroxide sanitation treatment. The sanitation treatment significantly reduced the number of Fusarium-contaminated seeds. Seedlings were grown in an operational conifer nursery and seedling infection and root colonization by Fusarium was assessed throughout the growing season. The number of seedlings with Fusarium root infections increased throughout the season, and remained highest for the standing water imbibition treatment of the contaminated seedlot. Seedborne Fusarium was an important source of inoculum in one of the two years of the study. Other sources of inoculum may have been pallets or debris, but planting mix and irrigation water used in the study did not appear to contain Fusarium. Seed sanitation was associated with a significant increase in average height, root collar diameter, and shoot and root dry weight for the seedlings from the contaminated seedlot but not for the uncontaminated seedlot. Contamination of seed by Fusarium during cone and seed processing was also investigated.
Item Metadata
Title |
Seedborne fusarium and root colonization of container-grown douglas-fir seedlings
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1993
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Description |
The role of seedborne Fusarium in root colonization of container-grown Douglas-fir seedlings was studied in two coastal Douglas-fir seedlots; one contaminated with Fusarium and the other with minimal Fusarium. Seedlots were treated using either a standing water imbibition, or a running water imbibition with a post-stratification hydrogen peroxide sanitation treatment. The sanitation treatment significantly reduced the number of Fusarium-contaminated seeds. Seedlings were grown in an operational conifer nursery and seedling infection and root colonization by Fusarium was assessed throughout the growing season. The number of seedlings with Fusarium root infections increased throughout the season, and remained highest for the standing water imbibition treatment of the contaminated seedlot. Seedborne Fusarium was an important source of inoculum in one of the two years of the study. Other sources of inoculum may have been pallets or debris, but planting mix and irrigation water used in the study did not appear to contain Fusarium. Seed sanitation was associated with a significant increase in average height, root collar diameter, and shoot and root dry weight for the seedlings from the contaminated seedlot but not for the uncontaminated seedlot. Contamination of seed by Fusarium during cone and seed processing was also investigated.
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Extent |
5001993 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2008-09-17
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0075177
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1993-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.