Host resistance and pathogen virulence across a plant hybrid zone |
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Authors: | U Carlsson-Granér J J Burdon P H Thrall |
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Institution: | Department of Ecology and Environmental Science Ume? University, S-901 87 Ume?, Sweden e-mail: ulla.carlsson-graner@eg.umu.se Tel.: +46-90-7869778, Fax: +46-90-7866691, SE Centre for Plant Biodiversity Research, CSIRO-Plant Industry, GPO Box 1600, Canberra, A.C.T, 2601, Australia, AU
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Abstract: | Hybridization between locally adapted plant populations has been postulated to have significant evolutionary consequences,
and, in particular, may influence host-pathogen interactions with respect to resistance and virulence structure. This study
investigated patterns of resistance and virulence in a hybrid zone between ”bog” and ”hill” ecotypes of the native Australian
flax, Linum marginale, where the host is subject to attack by the rust pathogen, Melampsora lini. Analysis of the resistance structure of adjoining bog, hill and hybrid populations found that bog plants were generally
susceptible to pathogen isolates taken from all these sites, but that hybrids exhibited resistance levels similar to the more
resistant hill plants. Similarly, the virulence structure of rust isolates collected from the hybrid population was more similar
to that of the hill isolates than the bog. Controlled crosses between bog and hill plants showed that crosses in one direction
(bog females×hill males) were much more successful than the other. A multi-year reciprocal transplant study further indicated
that bog plants had significantly higher survivorship than hill plants, regardless of site. It is suggested that likelihood
of differential gene flow and survivorship for bog and hill plants may at least partially explain the maintenance of a relatively
narrow hybrid zone.
Received: 5 October 1999 / Accepted: 1 July 1999 |
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Keywords: | Flax rust Linum Melampsora Coevolution Hybrid zone |
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