High level of genetic differentiation for allelic richness among populations of the argan tree [Argania spinosa (L.) Skeels] endemic to Morocco (original) (raw)
Abstract
Genetic diversity at nine isozyme loci was surveyed in an endangered tree species, the argan tree, endemic to south-western Morocco. The species is highly diverse (3.6 alleles/locus) with populations strongly differentiated from each other (F ST=0.25). This example is used to illustrate a method for standardizing measures of allelic richness in samples of unequal sample sizes, which was developed for the estimation of the number of species and relies on the technique of rarefaction. In addition, it is shown that the measure of subdivision, θ ST, obtained when allelic richness is used in place of_h_ (Nei's index of diversity), is much larger than the F ST [e.g. θ ST(40)=0.52, where (40) indicates the specified sample used to estimate the allelic richness]. This suggests that rare alleles (which strongly influence measures of allelic richness) have a more scattered distribution than more frequent ones, a result which raises special conservation issues for the argan tree.
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Authors and Affiliations
- Laboratoire d' Agroforesterie, Faculté des Sciences, Département de Biologie, Université Ibnou Zohr, BP 28S, Agadir, Morocco
A. El Mousadik - Laboratoire de Génétique et Amélioration des Arbres Forestiers, Institut National de la Recherche Agronomique, BP 45, 33611, Gazinet Cedex, France
R. J. Petit
Authors
- A. El Mousadik
- R. J. Petit
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Communicated by P. M. A. Tigerstedt
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El Mousadik, A., Petit, R.J. High level of genetic differentiation for allelic richness among populations of the argan tree [Argania spinosa (L.) Skeels] endemic to Morocco.Theoret. Appl. Genetics 92, 832–839 (1996). https://doi.org/10.1007/BF00221895
- Received: 28 October 1995
- Accepted: 17 November 1995
- Issue date: May 1996
- DOI: https://doi.org/10.1007/BF00221895