Abstract
Anther smuts in the genus Microbotryum often show very high host specificity toward their caryophyllaceous hosts, but some of the larger host groups such as Dianthus are crucially undersampled for these parasites so that the question of host specificity cannot be answered conclusively. In this study we sequenced the internal transcribed spacer (ITS) region of members of the Microbotryum dianthorum species complex as well as their Dianthus hosts. We compared phylogenetic trees of these parasites including sequences of anther smuts from other Caryophyllaceae, mainly Silene, with phylogenies of Caryophyllaceae that are known to harbor anther smuts. Additionally we tested whether observed patterns in parasites are due to shared ancestry or if geographic separation is a factor that should be taken into consideration in delimitating species. Parasites on Dianthus showed mainly an arbitrary distribution on Dianthus hosts, whereas parasites on other Caryophyllaceae formed well-supported monophyletic clades that corresponded to restricted host groups. The same pattern was observed in the Caryophyllaceae studied: morphologically described Dianthus species did not correspond well with monophyletic clades based on molecular data, whereas other Caryophyllaceae mainly did. We suggest that these different patterns primarily result from different breeding systems and speciation times between different host groups as well as difficulties in species delimitations in the genus Dianthus.
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Acknowledgments
This work was funded by various phases of the project Flora Mycologica Iberica (DGES, PB98-0538-C04-01; REN2002-04068-CO2-01GLO), coevolution project (CGL2004-00322/BOS), DFG Be 2201/4-2 and SYNTHESYS & European Commission of Transnational Access to major Research Infrastructures (EC-funded IHP Program) ES-TAF-1431 to MK. Thanks to Teresa Almaraz for some of the collections used in this study conserved in silica gel and SEM photographs obtained during her PhD thesis supported by the Flora Mycologica Iberica project. We would like to thank Félix Muñoz-Garmendia for helping with the taxonomy of the Spanish Dianthus specimens. Thanks to all staff from the herbaria where the collections are allocated (MA and MA-Fungi in Madrid; Herbarium Berolinense; Botanische Staatssammlung München; Tübinger Atlas des Vorderen Orients (TAVO); Herbarium Tubingense) as well as M. Koltzenburg, V. Kummer, M. Lutz and M. Piątek for providing specimens and Birgit Lemke for help with DNA sequencing of Dianthus. We would also like to thank Nicky Creux who helped us to improve the manuscript.
We thank the two anonymous reviewers for helpful comments.
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Genetic and geographic distances and coding for ANOVA of Microbotryum on Dianthus species (PDF 127 kb)
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Genetic and geographic distances and coding for ANOVA of Microbotryum on Silene species (PDF 71 kb)
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Results for the ANOVA using the reduced data set for the genetic and geographic distances. (PDF 273 kb)
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Results of the tip-association study using BaTS (PDF 30 kb)
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Kemler, M., Martín, M.P., Telleria, M.T. et al. Contrasting phylogenetic patterns of anther smuts (Pucciniomycotina: Microbotryum) reflect phylogenetic patterns of their caryophyllaceous hosts. Org Divers Evol 13, 111–126 (2013). https://doi.org/10.1007/s13127-012-0115-1
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DOI: https://doi.org/10.1007/s13127-012-0115-1