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AOBPreview originally published online on September 5, 2007
Annals of Botany 2007 100(6):1143-1154; doi:10.1093/aob/mcm200
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

A Preliminary Study of Genetic Variation in Populations of Monstera adansonii var. klotzschiana (Araceae) from North-East Brazil, Estimated with AFLP Molecular Markers

I. M. Andrade1, S. J. Mayo2,*, C. van den Berg1, M. F. Fay3, M. Chester3, C. Lexer3 and D. Kirkup2

1 Programa de Pós-Graduação em Botânica, Universidade Estadual de Feira de Santana (UEFS), Departamento de Ciências Biológicas, Avenida Universitária s/n, 44031–460, Feira de Santana, Bahia, Brazil
2 Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AE, UK
3 Genetics Section, Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS, UK

* For correspondence. E-mail s.mayo{at}kew.org

Received: 23 March 2007    Returned for revision: 5 June 2007    Accepted: 4 July 2007    Published electronically: 6 September 2007

Background and Aims: This study sought genetic evidence of long-term isolation in populations of Monstera adansonii var. klotzschiana (Araceae), a herbaceous, probably outbreeding, humid forest hemi-epiphyte, in the brejo forests of Ceará (north-east Brazil), and clarification of their relationships with populations in Amazonia and the Atlantic forest of Brazil.

Methods: Within-population genetic diversity and between-population dissimilarity were estimated using AFLP molecular markers in 75 individuals from eight populations located in Ceará, the Brazilian Atlantic Forest and Amazonia.

Key Results: The populations showed a clinal pattern of weak genetic differentiation over a large geographical region (FST = 0·1896). A strong correlation between genetic and geographical distance (Mantel test: r = 0·6903, P = 0·002) suggests a historical pattern of isolation by distance. Genetic structure analysis revealed at least two distinct gene pools in the data. The two isolated Ceará populations are significantly different from each other (pairwise {Phi}PT = 0·137, P = 0·003) and as diverse (Nei's gene diversity, average He = 0·1832, 0·1706) as those in the Atlantic and Amazon forest regions. The population in southern Brazil is less diverse (Nei's gene diversity, average He = 0·127) than the rest. The Ceará populations are related to those of the Atlantic forest rather than those from Amazonia (AMOVA, among-groups variation = 11·95 %, P = 0·037).

Conclusions: The gene pools detected within an overall pattern of clinal variation suggest distinct episodes of gene flow, possibly correlated with past humid forest expansions. The Ceará populations show no evidence of erosion of genetic diversity, although this was expected because of their isolation. Their genetic differentiation and relatively high diversity reinforce the importance of conserving the endangered brejo forests.

Key words: AFLP, Amazonia, Araceae, Atlantic forest, brejo forest, French Guiana, Monstera adansonii var. klotzschiana, north-east Brazil, population genetic variation


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