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Plant Systematics and Evolution

, Volume 267, Issue 1–4, pp 129–146 | Cite as

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

  • E. L. BorbaEmail author
  • R. R. Funch
  • P. L. Ribeiro
  • E. C. Smidt
  • V. Silva-Pereira
Article

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.

Keywords

Allozyme campo rupestre Chapada Diamantina conservation morphometrics Orchidaceae Sophronitis sincorana variability 

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Copyright information

© Springer 2007

Authors and Affiliations

  • E. L. Borba
    • 1
    Email author
  • R. R. Funch
    • 2
  • P. L. Ribeiro
    • 2
  • E. C. Smidt
    • 2
  • V. Silva-Pereira
    • 2
  1. 1.Departamento de BotânicaUniversidade Federal de Minas Gerais, Instituto de Ciências BiológicasBelo HorizonteBrazil
  2. 2.Departamento de Ciências BiológicasUniversidade Estadual de Feira de Santana, Laboratório de Sistemática Molecular de PlantasFeira de SantanaBrazil

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