Genetic variability in natural populations of <Emphasis Type="Italic">Paspalum dilatatum</Emphasis> Poir. analyzed by means of morphological traits and molecular markers |
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| Authors: | María Victoria García Pedro A Balatti Miguel J Arturi |
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| Institution: | 1.Departamento de Ciencias Biológicas, Facultad de Ciencias Agrarias y Forestales,Universidad Nacional de La Plata,Buenos Aires,Argentina;2.Department of Ecology and Environmental Science,University of Ume?,Ume?,Sweden |
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| Abstract: | Native species show adaptive traits that are difficult to find in introduced species. The Pampas region in Argentina is a
valuable nature reserve of grasses and Paspalum dilatatum Poir. is one of the most important grasses found there. Based on ploidy level and on morphological traits, five biotypes
of P. dilatatum have been described. Two of them were included in this study: a tetraploid biotype with sexual reproduction and a pentaploid
biotype with apomictic reproduction. We analyzed the genetic diversity in eight native populations from the Salado basin,
Argentina, using both quantitative traits and molecular data (RAPD) with these aims: to obtain information of the degree of
phenotypic variation in that area, to know which the pattern of distribution of this variation is and to look for association
between molecular markers with populational or biotypic differentiation. Cluster analysis based on morphological data grouped
the individuals of the different populations by ploidy level. Molecular markers showed the inverse situation because individuals
were grouped by geographic origin as opposed to biotype. Moreover, since RAPD did not discriminate between biotypes with sexual
or apomictic reproduction, they are probably not associated with mating system. The results let us conclude that polygenic
traits such as LP, LBSR, NRT and NSP can discriminate between biotypes and molecular markers such as bands 12, 40, 19 and
46 can be used to discriminate among populations, probably because they detect neutral variation.
The article is part of a thesis presented by María Victoria García in partial fulfillment of the requirements for the Doctor’s
degree, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina. |
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| Keywords: | Apomictic grass Natural variation Dallisgrass Paspalum dilatatum Pentaploid biotype Tetraploid biotype |
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