Skip to Main Content
The role of tree improvement programs for ex situ gene conservation of coastal Douglas-fir in the Pacific Northwest.Author(s): Sara R. Lipow; G. Randy Johnson; J. Bradley St. Claiff; Keith J. Jayawickrama
Source: Forest Genetics. 10(2): 111-120
Publication Series: Scientific Journal (JRNL)
PDF: Download Publication (737 KB)
DescriptionWe enumerate the genetic resources for coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) in tree improvement programs in the Pacific Northwest USA and evaluate how they contribute to gene conservation of the species. The first-generation programs include over four million progeny from 33,928 selections planted on 999 test sites. Nearly 2,000 of the selections tested in the first-generation have been incorporated into second-generation programs. The first-generation tests serve as repositories for low-frequency alleles of potential future import and for variation in quantitative traits not presently under selection. Much of this genetic variation also resides in the many large in situ populations of Douglas-fir, but it can be more easily detected in genetic tests. Additionally, useful genetic variation can be more rapidly integrated into tree improvement programs with the least loss of genetic gain if it is identified in genetic tests rather than in in situ populations. Because first-generation genetic tests are of limited life we develop a method for creating gene resource outplantings to retain for a longer period the valuable genetic resources in them.
- Visit PNW's Publication Request Page to request a hard copy of this publication.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLipow, Sara R.; Johnson, G. Randy; St. Claiff, J. Bradley; Jayawickrama, Keith J. 2003. The role of tree improvement programs for ex situ gene conservation of coastal Douglas-fir in the Pacific Northwest. Forest Genetics. 10(2): 111-120
Keywordsgenetic tests, conservation genetics, Pseudotsuga menziesii, tree breeding
- Calibration and modification for the Pacific Northwest of the New Zealand Douglas-fir silvicultural growth model.
- WestPro: a computer program for simulating uneven-aged Douglas-fir stand growth and yield in the Pacific Northwest.
- Twelve-year responses of planted and naturally regenerating conifers to variable-retention harvest in the Pacific Northwest, USA
XML: View XML