Temporal isolation explains host-related genetic differentiation in a group of widespread mycoparasitic fungi

Kiss, Levente and Pintye, Alexandra and Kovacs, Gabor M. and Jankovics, Tunde and Fontaine, Michael C. and Harvey, Nick and Xu, Xiangming and Nicot, Philippe C. and Bardin, Marc and Shykoff, Jacqui A. and Giraud, Tatiana (2011) Temporal isolation explains host-related genetic differentiation in a group of widespread mycoparasitic fungi. Molecular Ecology, 20 (7). pp. 1492-1507. ISSN 0962-1083

Abstract

Understanding the mechanisms responsible for divergence and specialization of pathogens on different hosts is of fundamental importance, especially in the context of the emergence of new diseases via host shifts. Temporal isolation has been reported in a few plants and parasites, but is probably one of the least studied speciation processes. We studied whether temporal isolation could be responsible for the maintenance of genetic differentiation among sympatric populations of Ampelomyces, widespread intracellular mycoparasites of powdery mildew fungi, themselves plant pathogens. The timing of transmission of Ampelomyces depends on the life cycles of the powdery mildew species they parasitize. Internal transcribed spacer sequences and microsatellite markers showed that Ampelomyces populations found in apple powdery mildew (Podosphaera leucotricha) were genetically highly differentiated from other Ampelomyces populations sampled from several other powdery mildew species across Europe, infecting plant hosts other than apple. While P. leucotricha starts its life cycle early in spring, and the main apple powdery mildew epidemics occur before summer, the fungal hosts of the other Ampelomyces cause epidemics mainly in summer and autumn. When two powdery mildew species were experimentally exposed to Ampelomyces strains naturally occurring in P. leucotricha in spring, and to strains naturally present in other mycohost species in autumn, cross-infections always occurred. Thus, the host-related genetic differentiation in Ampelomyces cannot be explained by narrow physiological specialization, because Ampelomyces were able to infect powdery mildew species they were unlikely to have encountered in nature, but instead appears to result from temporal isolation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher. However, article can be gained for free at the publishers website at: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-294X.2011.05007.x/abstract;jsessionid=34FD53A4FFBBA787865C92805B41359E.f02t01
Faculty / Department / School: No Faculty
Date Deposited: 08 Jun 2017 07:48
Last Modified: 08 Jun 2017 08:44
Uncontrolled Keywords: biotrophic pathogens; isolation in time; speciation; tri-trophic interactions
Fields of Research : 06 Biological Sciences > 0605 Microbiology > 060505 Mycology
06 Biological Sciences > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1111/j.1365-294X.2011.05007.x
URI: http://eprints.usq.edu.au/id/eprint/31894

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