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Allozyme variation of Port-Orford-Cedar (Chamaecyparis lawsoniana): implications for genetic conservationAuthor(s): Constance I. Millar; Kimberly A. Marshall
Source: Forest Science. Vol. 37(4):p. 1060-1077
Publication Series: Miscellaneous Publication
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DescriptionVariation at 32 allozyme loci in nine disjunct populations of Part-Orford-cedar (POC) from the California floristic region was measured to estimate the amount and pattern of genetic variability in natural stands. Variation in electrophoretically detectable loci was moderately high, with mean number of alleles per locus = 1.9, 64.9% polymorphic loci, and observed heterozygosity = 0.13. Diversity was highest in the seven populations from the coastal mountains and lowest in the two populations from the inland portion of POC's distribution. The Sacramento River population in the inland group had only 44% polymorphic loci, and observed heterozygosity equaled 0.05. Populations in the inland region were allozymically distinct from those in the coastal region as well as from each other. Mean genetic distances among the coastal populations were 0.005 compared to 0.016 between the inland and coastal groups and 0.013 between inland populations. Population variation accounted for 5% of the total allozyme diversity. Genetic conservation efforts for POC in California are evaluated. In situ areas are already being established in some genetically important localities, although many gaps remain; ex situ coverage is inadequate.
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CitationMillar, Constance I.; Marshall, Kimberly A. 1991. Allozyme variation of Port-Orford-Cedar (Chamaecyparis lawsoniana): implications for genetic conservation. Forest Science. Vol. 37(4):p. 1060-1077
KeywordsPhytophthora lateralis, genetic diversity, isozymes
- Operational program to develop Phytophthora lateralis-resistant populations of Port-Orford-cedar (Chamaecyparis lawsoniana)
- Ecology, pathology, and management of Port-Orford-Cedar (Chamaecyparis lawsoniana).
- Genetic conservation and restoration of Chamaecyparis lawsoniana (Port-Orford-cedar) in the face of a non-native pathogen and changing climate – on the road to success
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