Genômica populacional de Handroanthus serratifolius e Tabebuia aurea
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2018-03-09
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Universidade Federal de Goiás
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Population genomics studies in Neotropical species are scarce, however, they are of great
importance for the understanding of the neutral and adaptive variations, in order to develop
strategies of management and conservation for the species. In this context our objective was
to verify the role of natural selection in the distribution of populations diversity in
Handroanthus serratifolius and Tabebuia aurea. Here, we study population genomics based in
sequence capture using 24,751 pre-developed probes. For H serratifolius were sampled c.
64,000 SNPs in 144 individuals from 16 populations. For T aurea were sampled c. 18,000 SNPs
in 48 individuals from 6 populations. Genetic differentiation was high (FST = 0.194, p <0.001)
in H. serratifolius and intermediate (FST = 0.144, p <0.001) in T. aurea. The inbreeding
coefficient was low in both species, however, in three populations of H. serratifolius it was
intermediate or high. The genetic structure of populations presented two genetic groups for
the populations sampled in the two species. H. serratifolius with high genetic differentiation
and T. aurea with admixture in all populations. We did not find SNPs outliers in the distribution
of FST values, due to the wide distribution of values found for the populations of the two
species. In the search for correlation between environmental variables and changes in allelic
frequency H. serratifolius presented only three SNPs, inside six genes and T. aurea presented
16 SNPs, inside 25 genes. The functional annotation of these genes showed relationship with
molecular processes, transposable elements and one in T. aurea related to resistance to
diseases. In conclusion, our data show a selection signal in H. serratifolius for only three loci
with local adaptation signal. In T. aurea our data show a greater number of locos (16 locos)
with local adaptation signal.
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VIEIRA, L. D. Genômica populacional de Handroanthus serratifolius e Tabebuia aurea. 2018. 46 f. Dissertação (Mestrado em Genética e Biologia Molecular) - Universidade Federal de Goiás, Goiânia, 2018.