Host jumps and radiation, not co‐divergence drives diversification of obligate pathogens : a case study in downy mildews and asteraceae
- Even though the microevolution of plant hosts and pathogens has been intensely studied, knowledge regarding macro-evolutionary patterns is limited. Having the highest species diversity and host-specificity among Oomycetes, downy mildews are a useful a model for investigating long-term host-pathogen coevolution. We show that phylogenies of Bremia and Asteraceae are significantly congruent. The accepted hypothesis is that pathogens have diverged contemporarily with their hosts. But maximum clade age estimation and sequence divergence comparison reveal that congruence is not due to long-term coevolution but rather due to host-shift driven speciation (pseudo-cospeciation). This pattern results from parasite radiation in related hosts, long after radiation and speciation of the hosts. As large host shifts free pathogens from hosts with effector triggered immunity subsequent radiation and diversification in related hosts with similar innate immunity may follow, resulting in a pattern mimicking true co-divergence, which is probably limited to the terminal nodes in many pathogen groups.
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| Author: | Young-Joon Choi, Marco ThinesORCiDGND |
|---|---|
| URN: | urn:nbn:de:hebis:30:3-379789 |
| DOI: | https://doi.org/10.1371/journal.pone.0133655 |
| ISSN: | 1932-6203 |
| Pubmed Id: | https://pubmed.ncbi.nlm.nih.gov/26230508 |
| Parent Title (English): | PLoS One |
| Publisher: | PLoS |
| Place of publication: | Lawrence, Kan. |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2015/07/31 |
| Date of first Publication: | 2015/07/31 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Release Date: | 2015/08/05 |
| Volume: | 10 |
| Issue: | (7): e0133655 |
| Page Number: | 21 |
| First Page: | 1 |
| Last Page: | 21 |
| Note: | Copyright: © 2015 Choi, Thines. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited |
| HeBIS-PPN: | 369862996 |
| Institutes: | Biowissenschaften / Biowissenschaften |
| Angeschlossene und kooperierende Institutionen / Senckenbergische Naturforschende Gesellschaft | |
| Biowissenschaften / Institut für Ökologie, Evolution und Diversität | |
| Fachübergreifende Einrichtungen / Biodiversität und Klima Forschungszentrum (BiK-F) | |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
| Sammlungen: | Universitätspublikationen |
| Sammlung Biologie / Sondersammelgebiets-Volltexte | |
| Licence (German): |  Creative Commons - Namensnennung 4.0 |
