期刊
PLANT BIOLOGY
卷 21, 期 1, 页码 122-132出版社
WILEY
DOI: 10.1111/plb.12909
关键词
Bromeliads; extinction risk; gene flow; hybridization; inselbergs; plant speciation; reproductive isolation
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [CNPq 475937/2013-9, 471775/2010-0]
- CNPq/CNR International Cooperation grant [CNPq 490510/2013-2]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [FAPESP-Biota 2009/52725-3, FAPESP 2014/15588-6]
- CNPq [300819/2016-1, CNPq 300927/2016-9]
- FAPESP [2014/01762-3]
- IAPT
Hybridization is a widespread phenomenon present in numerous lineages across the tree of life. Its evolutionary consequences range from effects on the origin and maintenance, to the loss of biodiversity. We studied genetic diversity and intra- and interspecific gene flow between two sympatric populations of closely-related species, Pitcairnia flammea and P. corcovadensis (Bromeliaceae), which are adapted to naturally fragmented Neotropical inselbergs, based on nuclear and plastidial DNA. Our main results indicate a strong reproductive isolation barrier, although low levels of interspecific gene flow were observed in both sympatric populations. The low rates of intraspecific gene flow observed for both P. corcovadensis and P. flammea populations corroborate the increasing body of evidence that inselberg bromeliad species are maintained as discrete evolutionary units despite the presence of low genetic connectivity. Nuclear patterns of genetic diversity and gene flow revealed that hybridization and introgression might not cause species extinction via genetic assimilation of the rare P. corcovadensis. In the face of reduced intraspecific gene exchange, hybridization and introgression may be important aspects of the Pitcairnia diversification process, with a positive evolutionary impact at the bromeliad community level, and thus contribute to increasing and maintaining genetic diversity in local isolated inselberg populations.
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