You are here: Home
/ Publication Information
Title: Genetic differentiation among populations of Pinus ponderosa from the upper Colorado River Basin
Author: Rehfeldt, Gerald;
Source: Botanical Gazette. 151(1):125-137.
Publication Series: Scientific Journal (JRNL)
Description: Genetic variation among 62 populations of ponderosa pine was studied by comparing seedlings from all populations according to (1) growth and development of 4-yr-old seedlings in three disparate common gardens and (2) patterns of shoot elongation of 2-yr-old seedlings in a greenhouse. Genetic variation was detected among populations for 19 of the variables, most of which were intercowelated. Two principal components accounted for 60% of the total interpopulation variance. Multiple regression analyses were used to relate genetic variation in 19 variables and two principal components to the elevation and geographic origin of the seed. The regression models produced values of R2 as large as .78 and accounted for more than 40% of the variance among populations for 14 of the variables, including both the first and second principal components. These models described genetic variation as occurring along a relatively steep elevational cline and along both primary and secondary geographic clines of relatively gentle slope. All clines paralleled patterns of environmental variation, particularly the length of the frost-free season and patterns of precipitation. Because genetic variation occurs along three clines simultaneously, genetic differentiation can be described as rampant. Nevertheless, similar genotypes tend to recur in similar environments.
Keywords: genetic variation, Pinus ponderosa, upper Colorado River Basin
- 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.
XML: View XML
Rehfeldt, G. E. 1990. Genetic differentiation among populations of Pinus ponderosa from the upper Colorado River Basin. Botanical Gazette. 151(1):125-137.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility