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Patterns of genetic diversity in southern and southeastern Araucaria angustifolia (Bert.) O. Kuntze relict populations

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Patterns of genetic diversity in southern and southeastern Araucaria angustifolia (Bert.) O. Kuntze relict populations

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Título Patterns of genetic diversity in southern and southeastern Araucaria angustifolia (Bert.) O. Kuntze relict populations
Autor Souza, Maria Isabel Ferreira de
Salgueiro, Fabiano
Carnavale-Bottino, Mariana
Felix, Durvalina Benedita
Ferreira, Márcio Alves
Bittencourt, Juliana Vitoria Messias
Margis, Rogerio
Resumo Habitat fragmentation and a decrease in population size may lead to a loss in population genetic diversity. For the first time, the reduction in genetic diversity in the northernmost limit of natural occurence (southeastern Brazil) of Araucaria angustifolia in comparison with populations in the main area of the species continuous natural distribution (southern Brazil), was tested. The 673 AFLPs markers revealed a high level of genetic diversity for the species (Ht = 0.27), despite anthropogenic influence throughout the last century, and a decrease ofH in isolated populations of southeastern Brazil (H = 0.16), thereby indicating the tendency for higher genetic diversity in remnant populations of continuous forests in southern Brazil, when compared to natural isolated populations in the southeastern region. A strong differentiation among southern and southeastern populations was detected (AMOVA variance ranged from 10%-15%). From Bayesian analysis, it is suggested that the nine populations tested form five “genetic clusters” (K = 5). Five of these populations, located in the northernmost limit of distribution of the species, represent three “genetic clusters”. These results are in agreement with the pattern of geographic distribution of the studied populations.
Contido em Genetics and molecular biology. Ribeirão Preto. Vol. 32, no. 3 (Sept. 2009), p. 546-556
Assunto Araucaria angustifolia
Genética
[en] AFLP
[en] Araucariaceae
[en] Araucaria forest
[en] Population genetics
[en] Relict populations
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/23415
Arquivos Descrição Formato
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