Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Sara R. Lipow; G. Randy Johnson; J. Bradley St. Claiff; Keith J. Jayawickrama
    Date: 2003
    Source: Forest Genetics. 10(2): 111-120
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (737 KB)


    We 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.

    Publication Notes

    • 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.


    Lipow, 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


    genetic tests, conservation genetics, Pseudotsuga menziesii, tree breeding

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page