Evolutionary diversification through hybridization in a wild host-pathogen interaction

被引:28
作者
Barrett, Luke G.
Thrall, Peter H.
Burdon, Jeremy J.
机构
[1] CSIRO Plant Ind, Canberra, ACT 2601, Australia
[2] Australian Natl Univ, Sch Bot & Zool, Canberra, ACT, Australia
关键词
coevolution; ecological specialization; geographic mosaic; red queen hypothesis; resistance; sex; virulence;
D O I
10.1111/j.1558-5646.2007.00141.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Coevolutionary outcomes between interacting species are predicted to vary across landscapes, as environmental conditions, gene flow, and the strength of selection vary among populations. Using a combination of molecular, experimental, and field approaches, we describe how broad-scale patterns of environmental heterogeneity, genetic divergence, and regional adaptation have the potential to influence coevolutionary processes in the Linum marginale-Melampsora lini plant-pathogen interaction. We show that two genetically and geographically divergent pathogen lineages dominate interactions with the host across Australia, and demonstrate a hybrid origin for one of the lineages. We further demonstrate that the geographic divergence of the two lineages of M. lini in Australia is related to variation among lineages in virulence, life-history characteristics, and response to environmental conditions. When correlated with data describing regional patterns of variation in host resistance diversity and mating system these observations highlight the potential for gene flow and geographic selection mosaics to generate and maintain coevolutionary diversification in long-standing host-pathogen interactions.
引用
收藏
页码:1613 / 1621
页数:9
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