TY  - JOUR
A1  - Choi, Young-Joon
A1  - Thines, Marco
T1  - Host jumps and radiation, not co‐divergence drives diversification of obligate pathogens : a case study in downy mildews and asteraceae
T2  - PLoS One
N2  - 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.
Y1  - 2015
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/37978
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-379789
SN  - 1932-6203
N1  - 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
VL  - 10
IS  - (7): e0133655
SP  - 1
EP  - 21
PB  - PLoS
CY  - Lawrence, Kan.
ER  -