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Demography, and genetic and morphological variability of the endangered Sophronitis sincorana (Orchidaceae) in the Chapada Diamantina, Brazil

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Abstract

We carried out a demographic study and evaluated the genetic and morphological variability in five populations of the endangered Sophronitis sincorana (Orchidaceae) endemic to Northeastern Brazil, based on allozyme and morphometric analyses. Plant density was approximately 0.5 plants/m2, and the projected total number of plants was approximately 50,000 individuals. However, fruit set and recruitment of individuals are rare. The genetic variability was very high in all populations (P = 100, A = 3.0−3.5, H e = 0.33−0.48), and all populations presented similar values of morphological variability. Low genetic and morphological structuring were found in the species (F ST = 0.053, AMRPP = 0.018). The elevated coefficient of endogamy encountered in populations of S. sincorana indicates the occurrence of structuring within the populations. The lack of correlation between morphological and genetic variation in this species indicates that none of the markers examined should be used separately for either conservation purposes.

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Authors and Affiliations

  1. Departamento de Botânica, Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, 31270-110, Brazil

    E. L. Borba

  2. Departamento de Ciências Biológicas, Universidade Estadual de Feira de Santana, Laboratório de Sistemática Molecular de Plantas, Rodovia BR 116, Km 03, Feira de Santana, Bahia, 44130-460, Brazil

    R. R. Funch, P. L. Ribeiro, E. C. Smidt & V. Silva-Pereira

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  1. E. L. Borba
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  2. R. R. Funch
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  3. P. L. Ribeiro
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  4. E. C. Smidt
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  5. V. Silva-Pereira
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Correspondence to E. L. Borba.

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Borba, E., Funch, R., Ribeiro, P. et al. Demography, and genetic and morphological variability of the endangered Sophronitis sincorana (Orchidaceae) in the Chapada Diamantina, Brazil. Plant Syst. Evol. 267, 129–146 (2007). https://doi.org/10.1007/s00606-007-0555-9

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