1. bookVolume 60 (2011): Issue 1-6 (December 2011)
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eISSN
2509-8934
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22 Feb 2016
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English
access type Open Access

Changes in Genetic Diversity of Whitebark Pine (Pinus albicaulis Engelm.) Associated with Inbreeding and White Pine Blister Rust Infection

Published Online: 05 Aug 2017
Volume & Issue: Volume 60 (2011) - Issue 1-6 (December 2011)
Page range: 113 - 123
Received: 09 Apr 2010
Journal Details
License
Format
Journal
eISSN
2509-8934
First Published
22 Feb 2016
Publication timeframe
1 time per year
Languages
English
Abstract

We investigated the association of inbreeding and infection by the introduced disease white pine blister rust (caused by the fungus Cronartium ribicola J. C. Fisch) with genetic diversity of whitebark pine (Pinus albicaulis Engelm.) by genetically comparing cohorts of different ages in natural stands. Isozyme analysis of bud tissue was used to estimate expected and observed heterozygosity (He and Ho), and Wright’s fixation index (Fis) for three age cohorts (seedling, young, and mature), sampled from 14 sites in British Columbia, Oregon, Idaho, and Montana. Comparison of genetic diversity parameters among cohorts within a site was used to assess the extent and persistence of inbreeding with age, while comparisons of parameters among sites within a cohort were used to assess the impact of the disease on genetic diversity. Significant evidence of inbreeding (Fis >0) was found in all age cohorts. When sites were stratified by level of blister rust infection, differences in Fis and Ho among cohorts were only significant when level of infection was low. A significant negative association was found between level of blister rust infection and Ho in the mature cohort. This suggests that when differential selection due to blister rust is weak, more heterozygous individuals may be favored; however, more homozygous individuals may have higher fitness under higher blister rust levels

Keywords

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