Pacific Southwest

Title: Allozyme variation of Port-Orford-Cedar (Chamaecyparis lawsoniana): implications for genetic conservation

Author: Millar, Constance I.; Marshall, Kimberly A.

Date: 1991

Source: Forest Science. Vol. 37(4):p. 1060-1077

Description: Variation 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.

Keywords: Phytophthora lateralis, genetic diversity, isozymes

View and Print this Publication (637 KB)

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.

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

Citation

Millar, 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.