Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (681 KB bytes)

Title: Embryonic genetic load in coastal Douglas-fir, Pseudotsuga menziesii var. menziesii.

Author: Sorensen, Frank C.;

Date: 1969

Source: American Naturalist. 103: 389-398

Publication Series: Miscellaneous Publication

Description: Genetic load has been estimated for a number of outcrossing organisms, for example, Drosophila (Malogolowkin-Cohen et al. 1964), Tribolium (Levene et al. 1965), and man (Morton, Crow, and Muller 1956). However, little informaiton about load of deleterious genes in higher plants has been published. The purpose of this article is to provide some data on plants by reporting an estimate of embryonic load in coastal Douglas-fir as determined from comparison of set of sound seed following self-pollination and following controlled crossing with unrelated pollen.

It was stated a decade ago (Dobzhansky 1957) that no estimates of frequency of deleterious and lethal genes were available for plants. This statement is still true in general, although some information does appear in the literature. For example, there are estimates or indications of load due to certain categories of genes in cultivated plants, especially genes causing chlorophyll deficiencies, as in maize (Crumpacker 1967) and pines (Eiche 1955; Snyder, Squillace, and Hamaker 1966). There are also data from some forest tree species, particularly coniferous species, which appear suitable for rough estimation of some part of the genetic load, although calculations of load have rarely been made (Fowler 1965b is an exception).

The present data from coastal Douglas-fir were originally collected for purposes other than calculation of genetic load. However, the "control" appears good enough and the number of trees sampled large enough that a well-based estimate of load is possible. Because of this and because load estimates on plants are rare, the results from coastal Douglas-fir are presented in detail here.

Publication Notes:

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

XML: View XML

Citation:


Sorensen, Frank C. 1969. Embryonic genetic load in coastal Douglas-fir, Pseudotsuga menziesii var. menziesii. American Naturalist. 103: 389-398

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.