Abstract
Onosma is a species-rich genus with complicated patterns of morphological and karyological variation, and controversial taxonomic treatments. In the present study we focused on the Asterotricha group, one of three major infrageneric groups, in the area of central and southern Europe. Ribosomal internal transcribed spacer (ITS) sequences and amplified fragment length polymorphism (AFLP) markers were used to assess species differentiation and relationships, and to gain insight into the evolutionary history of the group. ITS data supported the monophyly of the asterotrichous taxa. Six genetically differentiated entities were resolved by AFLP markers, corresponding to O. echioides, O. heterophylla s.l., O. thracica including O. rigida, O. malkarmayorum, O. taurica, and O. stellulata. Onosma stellulata is identified as the most differentiated lineage within the Asterotricha group, which is consistent with its unique chromosome number. Within O. heterophylla s.l., recognition of O. viridis as a species distinct from O. heterophylla s.str. is supported. On the other hand, O. tornensis appears to be conspecific with O. viridis. Inferring from the patterns of genetic diversity and divergence, the evolutionary history of O. heterophylla s.l. is discussed. Genetic variation within the polymorphic Apennine–Dalmatian O. echioides is almost continuous and shaped by isolation by distance, thus none of the previous intraspecific taxonomic concepts are valid. The assumed hybrid origin of O. malkarmayorum is supported, and its affinity to potential ancestors, O. heterophylla s.l. and O. thracica incl. O. rigida, is indicated. Future studies of asterotrichous Onosma species should focus on diversity centers in the eastern Mediterranean and Asia Minor, to build up a comprehensive taxonomic concept of the group and to clarify its evolution.
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Acknowledgments
We are grateful to Mária Čudejková, Emília Karasová, Marcus A. Koch, Filippo Maggi, L’uboš Majeský, Karol Marhold, Patrik Mráz, Gavril Negrean, Marián Perný, Helena Rosinová, Emília Sasáková, Alžbeta Szabóová, Stanislav Španiel, and Róbert Šuvada for assistance in plant material sampling and for technical help. We would also like to thank Nicodemo G. Passalacqua and Federico Selvi for useful information on some localities in Italy, Alessio Mengoni for the consultation on DNA isolation protocol, and Kateřina Svoboda and John Brooker for improving the English of the manuscript. We are grateful to anonymous reviewers for helpful comments on the manuscript. Finally, the Ministry of Environment of the Slovak Republic is also acknowledged for gently providing exception from nature conservation of Ministry of Environment of the Slovak Republic no. 1210/481/05-5.1, which allowed us to collect plant material in Slovakia. Support for this research was provided by the Grant Agency for Science, Bratislava (VEGA, No. 1/0012/08) and by the Slovak Research and Development Agency, Bratislava (APVV, No. 51-026404).
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Kolarčik, V., Zozomová-Lihová, J. & Mártonfi, P. Systematics and evolutionary history of the Asterotricha group of the genus Onosma (Boraginaceae) in central and southern Europe inferred from AFLP and nrDNA ITS data. Plant Syst Evol 290, 21–45 (2010). https://doi.org/10.1007/s00606-010-0346-6
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DOI: https://doi.org/10.1007/s00606-010-0346-6