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Abstract Detail


Lopez, Alicia [1], Bonasora, Marisa [2].

Phylogeography, genetic diversity and population structure in Oxalis sect. Palmatifoliae, a Patagonian endemic group.

Oxalis section Palmatifoliae is a monophylletic clade, endemic to southern Argentina that includes five species: O. adenophylla, O. enneaphylla, O. laciniata, O. loricata and O. morronei. The distribution of this section includes the high Andean mountains, up to 2200 meters, growing even on the sea coast, in both Patagonian ecoregions: High Andes and Steppe according to Cabrera. The goals were (1) to analyze the genetic diversity and its distribution within and among populations (2) to model its extant distributions to contrast with the phylogeographical patterns recovered for each species; and (3) to analyze the behavior of the section as a unit regarding the same parameters considered for the species level. We analyze 236 individuals of 27 natural populations for the five species. The resulting data matrix was analyzed using GenAlEx. Genetic diversity within and among populations were measured by the percentage of polymorphic bands, the effective and observed number of alleles, Shannon’s information index, and frequency-down-weighted marker. A hierarchical cluster analysis of genetic distance values was performed using the UPGMA, and a Discriminant Analysis was also carried out. In addition, an AMOVA procedure was performed. All the statistical analyses were carried out using InfoStat. PCoA was used to explore relationships among population in FADM. Based on ISSR (inter simple sequence repeat) markers and distribution modelling as implemented in Maxent, we performed two different analyzes. The first analysis included all the populations of each of the five species; and the other one grouping all the individuals of the section but not taking in consideration the separation in species. Ours results allows us to hypothesize that there is a pattern of differentiation within and among populations of the five species considered at the genetic level that can be test assessing the genetic structure and diversity. Distribution modelling is in agreement with the present distribution of all the species of the section but also suggests the possibility of occurrence in the High Andes regions where no one of this species were ever found. Then, we proposed that Chubut River acts as a natural barrier to species dispersion and colonization. Further investigations are necessary to test whether genetic structure and genetic variation within and among populations resulted from random population genetic processes or are the result of historical processes.

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1 - Instituto de Botanica Darwinion - CONICET, Labarden 200, San Isidro, Buenos Aires, 1642, Argentina
2 - Universidad de Buenos Aires, Facultad de Agronomia, Catedra de Botanica Sistematica, Ciudad Autonoma de Buenos Aires, Buenos Aires, 1417, Argentina


Presentation Type: Poster
Session: P, Biogeography
Location: Exhibit Hall/Omni Hotel
Date: Monday, June 26th, 2017
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PBG003
Abstract ID:356
Candidate for Awards:None

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