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


    Studies were made to determine how long Douglas-fir pollen remains viable after suspension in cool water form 0 to 34 days. Linear regression analysis of in vivo and in vitro tests indicated that filled seed efficiency and pollen viability, respectively, decreased about 3 percent per day. The relation may have been nonlinear the first 6 days, as little decrease occurred during that time. An in vitro test of the effect of none, one, or two drying cycles on previously wetted pollens revealed a great decrease in pollen viability after just one drying cycle. The in vivo test of 1-, 2-, and 3-percent pollen suspensions showed that the 3-percent suspension resulted in 15 percent greater filled seed efficiency than the 2-percent and 57 percent greater than the 1-percent suspension.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • 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.


    Copes, Donald L.; Vance, Nan C. 2000. Effects of water suspension and wet-dry cycling on fertility of Douglas-fir pollen. Res. Note PNW-RN-527. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 9 p


    Google Scholar


    Supplemental mass pollination, seed orchard, flowering, reproduction, filled seed efficiency, Douglas-fir, Pseudotsuga menziesii

    Related Search

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