Consistency of population genetics parameters estimated from isozyme and RAPDs dataset in species of genus <Emphasis Type="Italic">Prosopis</Emphasis> (Leguminosae,Mimosoideae) |
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Authors: | Laura Inés Ferreyra Cecilia Bessega Juan C Vilardi Beatriz O Saidman |
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Institution: | (1) Laboratorio de Genética, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina |
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Abstract: | Genetic variability, population structure and differentiation among 17 populations of 5 species and 2 natural interspecific
hybrids of section Algarobia of genus Prosopis were analyzed from data of 23 isozyme and 28 RAPD loci. Both markers indicated that the studied populations are highly variable.
P. alba populations in average showed lower values of genetic variability estimates from isozyme data, but this trend was not observed
for RAPD markers. The hierarchical analyses of the distribution of genetic variability showed that the highest proportion
of variation occurred within populations, the differentiation among species was intermediate and the lowest component was
observed among populations within species. The consistency between results from both dataset implies that they are not biased
and reflect the actual genetic structure of the populations analyzed. The matrices of Euclidean distances obtained from the
two sets of markers were highly correlated according to Mantel test. In both cases the corresponding phenogram and MDS plot
tended to cluster conspecific populations while hybrid populations were not intermediate between putative parents. Some disagreements
between isozyme and RAPD phenograms were observed mainly in the affinities of hybrid populations. Such inconsistencies might
result from reticular rather than dichotomic evolutionary relationships. The phenetic associations retrieved gave no support
to the division of the section Algarobia into series. |
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Keywords: | Genetic differentiation Genetic variability Isozymes Mimosoideae Prosopis RAPDs |
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