Fine-scale genetic structure in Tibouchina papyrus (Pohl) Toledo (Melastomataceae), an endemic and habitat-restricted species from Central Brazil
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Data
2015
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Resumo
Spatial genetic structure (SGS) is the non-random
distribution of genotypes in space, which is usually
correlated with life history traits and is driven by ecological
and demographic processes. This study aimed to use spatial
statistical analysis methods to assess genetic diversity and
spatial genetic structure in three known disjunct localities
where Tibouchina papyrus occurs, varying in aggregation
and density of individuals and in landscape characteristics.
This small tree species is endemic to the ‘‘Cerrado’’ (savannas)
region of Central Brazil and is also restricted to
elevation rock fields (‘‘campo rupestre’’). Therefore, it can
be considered a model species to help guide studies on
Cerrado endemic plants that are isolated with geographic
distributions restricted to this highland habitat. The analyses
were based on the polymorphisms at ten microsatellite loci.
Our working hypothesis was that wind-dispersed species,
such as T. papyrus, present no or low SGS because of the
long distance seed gene flow. The spatial genetic structure
was indeed weak for two of the three populations. The
intensity and shape of the SGS are related to density and
aggregation (defined by Ripley’s K statistic of spatial aggregation) of individuals in the three localities. Low SGS
occurs in populations with aggregation patterns, corroborating
the overall hypothesis, although in this species, this
pattern depends on the landscape characteristics of each
local population.
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Palavras-chave
Cerrado biome, Gene flow, Microsatellite, Pau-papel, SGS
Citação
LIMA, Jacqueline de Souza et al. Fine-scale genetic structure in Tibouchina papyrus (Pohl) Toledo (Melastomataceae), an endemic and habitat-restricted species from Central Brazil. Plant Systematics and Evolution, Heidelberg, v. 301, p. 1207-1213, 2015.