Skip to Main Content
Effect of population outcrossing rate on inbreeding depression in Pinus contorta var. murrayana seedlings.Author(s): Frank C. Sorensen
Source: Scandinavian Journal of Forest Research. 16: 391-403
Publication Series: Scientific Journal (JRNL)
PDF: View PDF (1.31 MB)
DescriptionSeft and cross families from three populatons (A, low-density, ecologically marginal site for lodgepole pine, and B + C, normal sites) were cultured in a common outdoor nursery for 2 yrs. Previous results results had shown higher natural selfing rates and lower inbreeding depression in embryo survival in A than in B + C. In the nursery test, selfing decreased means of size traits, retarded phenological development, increased variance among families within populations, increased the coefficient of within-family variance, and increased within-family skewness. The selfing depression of mean values was moderately less and the selfing inflation of within-plot variation was much less in A than in B + C. Results were compatible with the idea that the higher selfing rate in A had purged both severely deleterious alleles affecting embryo survival and severely deleterious deleterious alleles affecting later life-cycle traits related to plant size. Purging partially mitigated the genetic consequences associated with increased inbreeding in small populations, but even with purging, population A retained a large inbreeding depression in both embryonic and seedling traits.
- You may send email to email@example.com 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.
CitationSorensen, Frank C. 2001. Effect of population outcrossing rate on inbreeding depression in Pinus contorta var. murrayana seedlings. Scandinavian Journal of Forest Research. 16: 391-403
Keywordsdeleterious alleles, family variances, lodgepole pine, purging, selfing
- Early performance of Pinus contorta x banksiana hybrids
- Pinus contorta X banksiana hybrids tested in northern Rocky Mountains
- Earthworms, arthropods and plant litter decomposition in aspen (Populus tremuloides) and lodgepole pine(Pinus contorta) forests in Colorado, USA
XML: View XML