Molecular evidence for natural interspecific hybridization in Prosopis |
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Authors: | MV Vega P Hernández |
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Institution: | (1) Natural Resources Faculty, National University of Formosa, Formosa Province, Argentina;(2) Instituto de Agricultura Sostenible (CSIC), Apdo. 4084, 14080 Córdoba, Spain |
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Abstract: | Interspecific hybridization can occur under natural conditions among species of the Prosopis genus, potentially giving rise to hybrid individuals with increased adaptation values. A study was conducted to assess the
occurrence of interspecific hybridization among Prosopis in the Argentinian Chaco region and the species involved. The survey included seven hybrid individuals and their potential
parents. Principal component analysis (PCA) was carried out based on 16 morphological characters. The molecular marker study
was carried out by the comparison of RAPD patterns of amplification using six primers. A total of 91 RAPD fragments were analysed,
yielding 33 species-specific markers, 24 bands that were common to two or three parental lines, and 22 bands of unknown origin.
The dendrograms arising from Nei’s genetic distances derived from the molecular data showed a clustering pattern in agreement
with the grouping obtained by the PCA of the morphological traits. The results demonstrate the occurrence of interspecific
hybridization involving Prosopis alba, P. nigra and P. hassleri in the Argentinian Chaco. |
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Keywords: | Dendrogram Genetic distance Genetic similarity Principal Components Analysis RAPDs Species-specific markers |
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