INVESTIGADORES
SAMOLUK sergio Sebastian
congresos y reuniones científicas
Título:
Species, genomes and diversification in section Arachis
Autor/es:
JOSÉ G. SEIJO; SAMOLUK S.; CHALUP L; GRABIELE M.; ROBLEDO G.
Lugar:
Savannah, Georgia
Reunión:
Conferencia; 7th International Conference of the Peanut Research Community on Advances in Arachis through Genomics and Biotechnology (AAGB); 2014; 2014
Institución organizadora:
International Peanut Genome Initiative
Resumen:
In
the last ten years, botanical collections of Arachis species have been
intensified in Bolivia. Several new species have been discovered with
some very interesting characters, and the range of geographic
distribution was expanded for many of known taxa. In the same period the
species of section Arachis were re-arranged in six different genomes
and in three karyotypic subgroups. In this study we analyzed the
distribution of the Arachis section species and the variability of
chloroplast sequences (trnT?S and trnT?Y) in order to understand the
dispersal pathways and to shed light on the evolutionary history of the
section. The range distribution of the species showed a biogeographic
segregation of most of the genome and karyotype groups. Most of them
were associated to different biogeographic regions and river basins but
the chloroplast haplotypes recovered from the species did not. The major
diversity of haplotypes was concentrated in the Chiquitanía region, in
the San Ignacio Planalto. Two central haplotypes were recognized, one of
them for the A genome species and the other for the B, D, K, F and G
genomes. Both central haplotypes were widely distributed, covering most
of the species range. The remaining haplotypes (19) were more restricted
or specific to particular populations. The patterns of species and
haplotype distributions, together with the analyses of main
paleochannels in central South America, suggests that hydrochory may
have played a key role in long distance dispersal and establishment of
founders in allopatry. Genome differentiation may have occurred in
different river basins during Pliocene, while speciation within each
genome may have occurred also in isolation with incomplete linage
sorting for the markers analyzed