Caracterização genética de populações naturais de araticunzeiro (Annona crassiflora Mart.) pela análise de cpDNA
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2005-08-30
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Universidade Federal de Goiás
Resumo
The araticunzeiro (Annona crassiflora Mart.) is a tropical fruit tree species
from the Cerrado (Brazilian Savannah) with high economic potential. The strong
degradation of the Cerrado, allied to the predatory extractivism that threatens the species,
points out to the necessity of development of research to support future conservation
programs. With the aim to furnish information about the genetic status of this species and
to guide future conservation strategies, 82 individuals from 11 natural populations were
submitted to genetic analysis. The coalescent based analysis of the polymorphism present
in the trn-L cpDNA allowed the detection of high levels of genetic diversity in the species.
In spite of the high level of genetic similarity among different populations the results
produced suggested that, , there is an incipient, but statistically significant, increasing
differentiation process taking place due to current status of geographical isolation and
genetic drift. The genetic differentiation coefficient estimated was equal to 7.3%. The
spatial genetic divergence analyses suggested that the genetic distances are not associated
to geographical distances between populations, evidencing the absence of current gene
flow between adjacent populations. The coalescent based approach allowed the
identification of different evolutionary scenes to the investigated populations. Among
sampled populations cases from well conserved status to dangerous low levels of genetic
diversity were detected. Results obtained by the use of coalescent models to infer the
divergence time between populations suggested that natural populations of A. crassiflora
were, until recently, part of a great regional continuum. These findings suggest that the low
levels of genetic diversity among different populations must be due to the small time since
isolation.
Descrição
Palavras-chave
Cerrado , Araticunzeiro , Marcadores moleculares , cpDNA , genética de populações , diversidade genética , cerrado , araticunzeiro , molecular markers , cpDNA , populations genetics , gene diversity , 1. araticunzeiro Cerrados Goiás (Estado) 2. Árvores frutíferas
Cerrados Goiás (Estado) 3. Marcadores moleculares Cloroplastos
4. Genética de populações
Citação
BLANCO, Angel José Vieira. Genetic characterization of natural populations of araticunzeiro
(Annona crassiflora Mart.) by cpDNA sequence analysis. 2005. 94 f. Dissertação (Mestrado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2005.