Biosystematic study of the diploid‐polyploid Pilosella alpicola group with variation in breeding system: Patterns and processes

Abstract

Members of the Pilosella alpicola species group (Asteraceae) are distributed throughout the alpine region of the European mountains (Alps, Carpathians, Balkan mountains). Like other Pilosella species groups (Hieracium subg. Pilosella), the taxonomy and species' relationships are poorly understood mostly due to widespread facultative apomixis, frequent hybridization and polyploidization—the most important phenomena substantially involved in the evolutionary history of the genus. We assessed morphology, ploidy level, variation in breeding system and molecular variation within the P. alpicola group to provide a new taxonomic concept and to clarify evolutionary relationships among species and origin of polyploids. Multivariate morphometric analyses (UPGMA, CDA, PCA) applied on 324 plants originated from 21 populations revealed existence of four well‐separated clusters corresponding to four allopatric taxa: P. alpicola s. str. (Alps), P. rhodopea (Balkan Peninsula, Southern Carpathians), P. serbica (Serbia and Montenegro) and P. ullepitschii (Carpathians). In total, four ploidy levels (2x, 3x, 4x, 5x) were detected among 557 plants analysed from 19 populations by classical chromosome counting and flow cytometric analysis. The tetra‐ and pentaploids of P. alpicola s. str. have an allopatric distribution (Wallis Alps vs. Dolomites, respectively). Four ploidy levels with complex cytogeographic pattern and high frequency of mixed ploidy populations (75%) indicating a primary contact zone were recorded in P. rhodopea. Pilosella ullepitschii and P. serbica are exclusively diploid and are both sexually reproducing. In spite of a clear morphological separation, a molecular analysis (ITS and cpDNA sequences) suggests close relationships and rather recent origin of all studied taxa, except P. alpicola s. str. The latter taxon is an agamospermic allopolyploid that likely originated polytopi cally from a hybridization between P. rhodopea from the Balkans and P. glacialis from the Alps. In contrast to P. alpicola s. str., our data strongly support an autopolyploid origin of P. rhodopea polyploids which reproduced strictly sexually. Pilosella petraea, sometimes treated as a member of the P. alpicola group, differs from the remaining taxa by its conspicuous morphology, ecology and ITS polymorphism and should be removed from the group. Range shifts and extinctions were likely involved in shaping the evolutionary and modern distributional pattern of the group. Our combined methodological approach enabled us to propose a new taxonomic circumscription for the P. alpicola group and revealed auto‐ and allopolyploidization events.

Cytotype coexistence in the field cannot be explained by inter-cytotype hybridization alone: linking experiments and computer simulations in the sexual species Pilosella echioides (Asteraceae)

“…on Chamerion angustifolium [27, 37, 38]. Larger proportions of triploids found in some populations of Pilosella rhodopea (up to 97%, but clonal growth is expected here [39]), Chamerion angustifolium (9%, [40]) and Galax urceolata (up to 27%, [8]) suggest that triploids may be more viable and fertile than is commonly presumed. Triploids can not only contribute to the formation of tetraploids via the triploid bridge but can also play a role both in the stable coexistence of diploids and polyploids and in the fixation of tetraploids [27].…”

Allopatric distribution, ecology and conservation status of thePilosella alpicolagroup (Asteraceae)

“…Hieracium heuffelii Janka). However, our recent data do not support this circumscription, and both these taxa should be excluded from the section (Šingliarová et al 2011a). While the detailed distribution has been published only for the Carpathian endemic P. ullepitschii (Šingliarová and Mráz 2009), thorough chorological data for the three remaining species are still missing.…”

“…The plants from the Valais Alps are tetraploids, while the plants from the Italian Dolomites are pentaploid (Šingliarová et al 2011a). Disjunct distribution of cytotypes, different multi‐locus allozyme pattern and small morphological differences suggest a polytopic origin of this allopolyploid taxon arosen from hybridization between the two putative parental taxa P. rhodopea and P. glacialis (Reyn.…”

“…Bip. (Šingliarová et al 2011a, 2011b). According to castration and isolation experiments and flow cytometric seed screening analysis, the tetra‐ and pentaploids of P. alpicola reproduce apomictically (Šingliarová et al 2011a).…”

“…Bip.) Szeląg and P. ullepitschii (Błocki) Szeląg (Šingliarová and Mráz 2009, Šingliarová et al 2011a). According to Zahn’s and Szeląg’s taxonomic concepts (Zahn 1930, Szeląg 2008), Pilosella sect.…”