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Geographical patterns of gene frequencies in Italian populations of Ornithogalum montanum (Liliaceae)

Published online by Cambridge University Press:  14 April 2009

Massimo Pigliucci  and
Guido Barbujani
Massimo Pigliucci
Affiliation:
Istituto di Agroselvicoltura CNR, Parano (Terni), Italy
Guido Barbujani*
Affiliation:
Dipartimento di Biologia, Università di Padova, via Trieste 75, 1–35121 Padova, Italy
*
† Coresponding author.
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Geographic variation was studied at 15 electrophoretic loci (40 alleles) in Italian populations of Ornithogalum montanum Cyr. ex Ten. (Liliaceae). Homogeneity of allele frequencies was assessed by G tests; gene-frequency patterns were described by spatial autocorrelation statistics; matrices of genetic and environmental distance were compared through a series of Mantel's tests, and the zones of highest overall gene-frequency change per unit distance (steep multi-locus clines, or genetic boundaries) were identified. Nineteen allele frequencies appear heterogeneously distributed, but only 3 of them show significant spatial structure. Only 2 allele frequencies are correlated with 1 environmental parameter. Large genetic differences are observed between spatially close populations. These findings support a model of differentiation in which the genetic relationships between isolates do not depend on their spatial distances, but reflect mainly population subdivision and restricted gene flow.

Type
Research Article
Information
Genetics Research , Volume 58 , Issue 2 , October 1991 , pp. 95 - 104
Copyright
Copyright © Cambridge University Press 1991

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