Molecular Ecology (2007) 16, 89-99

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Xudong Zhou, Treena I. Burgess, Z. Wilhelm De Beer, Francois Lieutier, Annie Yart, Kier Klepzig, Angus Carnegie, Julio Mena Portales, Brenda D. Wingfield and Michael J. Wingfield (2007)
High intercontinental migration rates and population admixture in the sapstain fungus Ophiostoma ips
Molecular Ecology 16 (1), 89-99
Abstract: Ophiostoma ips is a common fungal associate of various conifer-infesting bark beetles in their native ranges and has been introduced into non-native pine plantations in the Southern Hemisphere. In this study, we used 10 microsatellite markers to investigate the population biology of O. ips in native (Cuba, France, Morocco and USA) and non-native (Australia, Chile and South Africa) areas to characterize host specificity, reproductive behaviour, and the potential origin as well as patterns of spread of the fungus and its insect vectors. The markers resolved a total of 41 alleles and 75 haplotypes. Higher genetic diversity was found in the native populations than in the introduced populations. Based on the origin of the insect vectors, the populations of O. ips in Australia would be expected to reflect a North American origin, and those in Chile and South Africa to reflect a European origin. However, most alleles observed in the native European population were also found in the native North American population; only the allele frequencies among the populations varied. This admixture made it impossible to confirm the origin of the introduced Southern Hemisphere (SH) populations of O. ips. There was also no evidence for specificity of the fungus to particular bark beetle vectors or hosts. Although O. ips is thought to be mainly self-fertilizing, evidence for recombination was found in the four native populations surveyed. The higher genetic diversity in the North American than in the European population suggests that North America could be the possible source region of O. ips.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Xudong Zhou, Brenda D. Wingfield, Michael J. Wingfield, Treena Burgess, François Lieutier, Z. Wilhelm de Beer, Angus J. Carnegie

Research topic(s) for pests/diseases/weeds:
molecular biology - genes
surveys/sampling/distribution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Ophiostoma ips Pine (Pinus) France
Ophiostoma ips Pine (Pinus) Australia (South+SE)
Ophiostoma ips Pine (Pinus) South Africa
Ophiostoma ips Pine (Pinus) Morocco
Ophiostoma ips Pine (Pinus) Cuba
Ophiostoma ips Pine (Pinus) Chile (continental)
Ophiostoma ips Pine (Pinus) U.S.A. (mid S)