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Journal of Heredity Advance Access published online on September 18, 2006
Journal of Heredity, doi:10.1093/jhered/esl031
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.
Received May 30, 2006
Accepted June 16, 2006

Article

Internal Genetic Structure and Outcrossing Rate in a Natural Population of Araucaria angustifolia (Bert.) O. Kuntze

Adelar Mantovani 1 *, L. Patrícia C. Morellato 2, and Maurício S. dos Reis 3

1 From the Departamento de Fitotecnia, Núcleo de Pesquisas em Florestas Tropicais, Universidade do Estado de Santa Catarina, 88520-000 Lages, Brazil
2 From the Departamento de Botânica, Grupo de Fenologia de Plantas e Dispersão de Sementes, Universidade Estadual Paulista, Instituto de Biociências, Caixa Postal 199, 13506-900 Rio Claro, Brazil
3 From the Departamento de Fitotecnia, Núcleo de Pesquisas em Florestas Tropicais, Universidade Federal de Santa Catarina, Caixa Postal 476, 88034-000 Florianópolis, Brazil

* To whom correspondence should be addressed.
Adelar Mantovani, E-mail: mantovani{at}cav.udesc.br


  Abstract

The internal genetic structure and outcrossing rate of a population of Araucaria angustifolia (Bert.) O. Kuntze were investigated using 16 allozyme loci. Estimates of the mean number of alleles per loci (1.6), percentage of polymorphic loci (43.8%), and expected genetic diversity (0.170) were similar to those obtained for other gymnosperms. The analysis of spatial autocorrelation demonstrated the presence of internal structure in the first distance classes (up to 70 m), suggesting the presence of family structure. The outcrossing rate was high (0.956), as expected for a dioecious species. However, it was different from unity, indicating outcrossings between related individuals and corroborating the presence of internal genetic structure. The results of this study have implications for the methodologies used in conservation collections and for the use or analysis of this forest species.


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