Abstract
Encholirium is a genus of 31 xerophytic terrestrial or epilithic bromeliad species endemic to eastern Brazil. Together with Dyckia and Deuterocohnia, it forms the so-called xeric clade of the Pitcairnioideae subfamily of Bromeliaceae. Encholirium species are adapted to rocky landscapes, and many of them are found in the rocky grassland fields of the Espinhaço in the state of Minas Gerais, which is considered the diversity center of the genus. Encholirium species and other bromeliads growing on isolated, island-like habitats like rock outcrops and “inselbergs” are often characterized by high levels of genetic structure and limited gene flow among populations, but there are also exceptions. In the present study, we applied nuclear and chloroplast microsatellite markers to investigate the genetic diversity and population structure of E. magalhaesii L.B.Sm., an endemic species of the Espinhaço, collected in four localities of the Diamantina municipality in southeastern Brazil. Moderate genetic differentiation among localities was revealed by the nuclear markers (Fst = 0.199), whereas genetic structuring was much higher with plastid markers (Fst = 0.496). Estimations of pollen/seed flow ratios suggest that pollen flow is more efficient in maintaining the genetic connectivity among E. magalhaesii populations than seed flow.
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Acknowledgements
The authors acknowledge financial support through the PROBRAL program (a joint initiative of CAPES, Coordination for the Improvement of Higher Education Personnel and DAAD, German Academic Exchange Service), as well for granting a sandwich research fellowship for the first author (CAPES Process 12429-12-0). The authors also acknowledge financial support obtained from CNPq (National Counsel of Technological and Scientific Development, Brasília, Brazil) and FACEPE (Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco) for a research fellowship (Process IBPG 1228-2.02/11). The authors thank D.S.B. Pinangé and G.A.S. Cruz for valuable suggestions and interesting discussions. We also acknowledge the important suggestions of two reviewers.
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RCGO collected all samples, performed laboratory work, statistical analysis and article writing; TW tested all primers, performed laboratory work, contributed with statistic analysis and article writing; and MGLW, KW and AMBI provided field and laboratory facilities for the work to be done and contributed substantially to the writing of the article.
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Gonçalves-Oliveira, R.C., Wöhrmann, T., Weising, K. et al. Genetic structure and gene flow among populations of Encholirium magalhaesii, a rocky grassland fields bromeliad. Braz. J. Bot 43, 283–290 (2020). https://doi.org/10.1007/s40415-020-00600-z
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DOI: https://doi.org/10.1007/s40415-020-00600-z