Ancient isolation and independent evolution of the three clonal lineages of the exotic sudden oak death pathogen Phytophthora ramorum

被引:93
|
作者
Goss, E. M. [1 ]
Carbone, I. [2 ]
Grunwald, N. J. [1 ]
机构
[1] USDA ARS, Hort Crops Res Lab, Corvallis, OR 97330 USA
[2] N Carolina State Univ, Dept Plant Pathol, Ctr Integrated Fungal Res, Raleigh, NC 27695 USA
关键词
coalescent; emerging disease; oomycete; plant disease; recombination; RXLR-class effector; EMERGING INFECTIOUS-DISEASES; POPULATION GENETIC-ANALYSIS; SOJAE-EFFECTOR AVR1B; IRISH POTATO FAMINE; DNA-SEQUENCES; CENTRAL MEXICO; MICROSATELLITE MARKERS; STATISTICAL TESTS; GENOME SEQUENCES; RESISTANCE GENE;
D O I
10.1111/j.1365-294X.2009.04089.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The genus Phytophthora includes some of the most destructive plant pathogens affecting agricultural and native ecosystems and is responsible for a number of recent emerging and re-emerging infectious diseases of plants. Sudden oak death, caused by the exotic pathogen P. ramorum, has caused extensive mortality of oaks and tanoaks in Northern California, and has brought economic losses to US and European nurseries as well due to its infection of common ornamental plants. In its known range, P. ramorum occurs as three distinct clonal lineages. We inferred the evolutionary history of P. ramorum from nuclear sequence data using coalescent-based approaches. We found that the three lineages have been diverging for at least 11% of their history, an evolutionarily significant amount of time estimated to be on the order of 165 000 to 500 000 years. There was also strong evidence for historical recombination between the lineages, indicating that the ancestors of the P. ramorum lineages were members of a sexually reproducing population. Due to this recombination, the ages of the lineages varied within and between loci, but coalescent analyses suggested that the European lineage may be older than the North American lineages. The divergence of the three clonal lineages of P. ramorum supports a scenario in which the three lineages originated from different geographic locations that were sufficiently isolated from each other to allow independent evolution prior to introduction to North America and Europe. It is thus probable that the emergence of P. ramorum in North America and Europe was the result of three independent migration events.
引用
收藏
页码:1161 / 1174
页数:14
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