Dissertation
Breeding wheat for efficient nitrogen use in low-input and organic systems in the Pacific Northwest
Washington State University
Doctor of Philosophy (PhD), Washington State University
05/2008
DOI:
https://doi.org/10.7273/000005853
Abstract
This study sought to elucidate the sources of variation for nitrogen use efficiency (NUE) in wheat grown in organic and low-input agricultural systems. Wheat selected under different N regimes was compared for traits related to NUE in the field and in the greenhouse. Annual winter wheat varieties and breeding lines and a perennial bulk population were used in the field study, and annual spring wheat varieties, perennial breeding lines and a series of chromosome addition lines was used in the greenhouse. An analysis of covariance (ANCOVA) and a principal components analysis (PCA) were used to assess variation for traits of interest. From the ANCOVA, it is apparent that there is significant genetic variation for traits related to N use in organic systems in this sample of genotypes. Environmental and genotype by environmental interactions are also present. PCA was useful in determining the relationships among measured variables and in grouping genotypes according to their agronomic responses to organic nitrogen management. In addition to the field and greenhouse experiments, the role of participatory plant breeding in meeting the needs of farmers in organic and low-input systems was studied. A mail survey of Washington wheat growers and a series of focus-group roundtables were conducted to obtain input from farmers on the wheat breeding program goals. The survey revealed that 52% of respondents are interested in a participatory wheat breeding program. An analysis of the survey data looked at farmer interest in participatory research to help the breeding program meet its goal of including more farmers in the breeding process.
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Details
- Title
- Breeding wheat for efficient nitrogen use in low-input and organic systems in the Pacific Northwest
- Creators
- Julie Dawson
- Contributors
- Stephen S. Jones (Chair)
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Crop and Soil Sciences
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 331
- Identifiers
- 99901055037201842
- Language
- English
- Resource Type
- Dissertation