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A model of genetic variation for Pinus ponderosa in the Inland Northwest (U.S.A.): applications in gene resource managementAuthor(s): Gerald Rehfeldt
Source: Canadian Journal of Forest Research. 21: 1491-1500.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
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DescriptionModels were developed to describe genetic variation among 201 seedling populations of Pinus ponderosa var. ponderosa in the Inland Northwest of the United States. Common-garden studies provided three variables Jhat reflected growth and development in field environments and three principal components of six variables that reflected patterns of shoot elongation. Regression models were developed for describing genetic variation across the landscape. Using functions of latitude, longitude, and elevation as descriptors, these models produced values of R2 that were as large as 0.66, while averaging 0.39. The models described genetic variation as occurring along relatively steep elevational clines and gentle geographic (Le., latitudinal and longitudinal) clines. An exercise at validating the models with independent data supported their veracity. Predictions made by the models are applied to limiting seed transfer, designing breeding zones, planning gene conservation programs, interpreting phenotypic variation, and predicting the effects of environmental change on the adaptedness of populations.
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CitationRehfeldt, G. E. 1991. A model of genetic variation for Pinus ponderosa in the Inland Northwest (U.S.A.): applications in gene resource management. Canadian Journal of Forest Research. 21: 1491-1500.
KeywordsPinus ponderosa, Inland Northwest
- Genetic differentiation among populations of Pinus ponderosa from the upper Colorado River Basin
- Ecology of southwestern ponderosa pine forests
- Geographic variation in ponderosa pine leader growth
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