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  • Meeting in Liguria : hybridisation between Apennine endemic Euphorbia barrelieri and western Mediterranean E. nicaeensis led to the allopolyploid origin of E. ligustica
    Skubic, Maruša, 1996- ; Záveská, Eliška ; Frajman, Božo
    The Mediterranean Basin is renowned for its extremely rich biota and is considered as one of the 25 Global Biodiversity Hotspots, but its diversity is not homogeneously distributed. Outstanding in ... the number of (endemic) species are the Ligurian Alps (Italy). At the foot of the Ligurian Alps, little above the Mediterranean Sea, a disjunct occurrence of Italian endemic Euphorbia barrelieri was reported. Using an array of integrative methods ranging from cytogenetic (chromosome number and relative genome size estimation), over phylogenetic approaches (plastid, ITS and RAD sequencing) to multivariate morphometrics we disentangled the origin of these populations that were shown to be tetraploid. We performed phylogenetic analyses of the nuclear ITS and plastid regions of a broad taxonomic sampling of Euphorbia sect. Pithyusa to identify possible species involved in the origin of the tetraploid populations and then applied various analyses of RADseq data to identify the putative parental species. Our results have shown that the Ligurian populations of E. barrelieri are of allotetraploid origin that involved E. barrelieri and western Mediterranean E. nicaeensis as parental species. We thus describe a new species, E. ligustica, and hypothesise that its adaptation to similar environments in which E. barrelieri occurs, triggered development of similar morphology, whereas its genetic composition appears to be closer to that of E. nicaeensis. Our study emphasises the importance of polyploidisation for plant diversification, highlights the value of the Ligurian Alps as a hotspot of biodiversity and endemism and underlines the importance of integrative taxonomic approaches in uncovering cryptic diversity.
    Source: Molecular phylogenetics and evolution. - ISSN 1055-7903 (art. no. 107805, Vol. 185, 2023, 15 str.)
    Type of material - article, component part
    Publish date - 2023
    Language - english
    COBISS.SI-ID - 154027267

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S1055790323001057
    Repository of the University of Ljubljana – RUL
    DOI

source: Molecular phylogenetics and evolution. - ISSN 1055-7903 (art. no. 107805, Vol. 185, 2023, 15 str.)
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