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| Web URL(s): | http://www.bioone.org/bioone/?request=get-document&issn=0043-1745&volume=050&issue=02&page=0241
Last checked: 11/2005
Access conditions: Item is within a limited access website |
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| Publication Type:
| Refereed |
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| Author(s): | Allen, Phil S.;
Meyer, Susan E. |
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| Author Affiliation: | Allen: Department of Agronomy and Horticulture, Brigham Young University, Provo, UT; and Meyer: USDA Forest Service Rocky Mountain Research Station Shrub Sciences Laboratory, Provo, UT |
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| Title: | Ecology and ecological genetics of seed dormancy in downy brome |
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| Section: | Symposium
Other records with the "Symposium" Section
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| Source: | Weed Science. Vol. 50, No. 2, March/April 2002, p. 241-247. |
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| Publishing Information: | Champaign, IL: Weed Science Society of America |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Ecology; Genetics; Seed dormancy; Bromus tectorum; Ecological distribution; Temperatures; Habitats; Models
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| Abstract/Contents: | "Downy brome, an obligately selfing winter annual, has invaded a variety of habitats in western North America. Seeds are at least conditionally dormant at dispersal in early summer and lose dormancy through dry after-ripening. In the field, patterns of germination response at dispersal vary among populations and across years within populations. Degree of dormancy at summer temperatures in recently harvested seeds, as well as rate of dormancy loss during dry storage, can be related to the risk of premature summer germination in different habitats. Patterns of dormancy loss are predictable and can be modeled using hydrothermal time concepts. To assess the relative contribution of genotype and maturation environment, multiple parental lines from contrasting populations were grown for three generations under manipulated greenhouse conditions. Significant germination response differences among populations were observed, as well as major differences among full-sib families. Among-population variation accounted for over 90% of the variance in germination traits, whereas within-family variance accounted for 1% or less. Populations from predictable extreme environments (subalpine meadow and warm desert margin) showed significantly less variation among families than did populations from less predictable environments (cold desert, foothill, and plains). Environmental conditions that shortened the seed ripening period (waterstress and high temperature) resulted in reduced seed dormancy level at maturation, but there were strong inbred line-environment interactions. For fully after-ripened seeds, inbred line and environmental effects were no longer evident, indicating that differences in genotype and maturation environment function mainly to regulate dormancy and dormancy loss rather than to mediate response patterns of nondormant seeds." |
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| Language: | English |
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| References: | 33 |
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| Note: | Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Allen, P. S., and S. E. Meyer. 2002. Ecology and ecological genetics of seed dormancy in downy brome. Weed Sci. 50(2):p. 241-247. |
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| Web URL(s):
http://www.bioone.org/bioone/?request=get-document&issn=0043-1745&volume=050&issue=02&page=0241
Last checked: 11/2005
Access conditions: Item is within a limited access website |
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MSU catalog number: SB 610 .W38 |
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