Low genetic diversity and strong geographic structure in introduced populations of the Eucalyptus foliar pathogen Teratosphaeria destructans |
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| Authors: | Minette Havenga Brenda D Wingfield Michael J Wingfield Léanne L Dreyer Francois Roets ShuaiFei Chen Janneke Aylward |
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| Institution: | 1. Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Hatfield, South Africa;2. Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa;3. Department of Conservation Ecology and Entomology, Stellenbosch University, Matieland, South Africa;4. China Eucalypt Research Centre (CERC), Chinese Academy of Forestry (CAF), ZhanJiang, China |
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| Abstract: | The aggressive Eucalyptus leaf pathogen, Teratosphaeria destructans, causes widespread damage in tropical and subtropical Eucalyptus-growing regions of Indonesia, China, Thailand, East Timor, Vietnam, Lao, and South Africa. Little is known regarding the origin, pathways of dispersal, or reproductive biology of this pathogen. The aim of this study was to investigate the genetic structure of a global collection of T. destructans isolates. This was achieved by developing and using polymorphic microsatellite markers. Low genotypic diversity and a limited number of private alleles were found in all investigated populations, with the highest maximum diversity of 10.7% in isolates from South Sumatra. This supports the hypothesis that T. destructans was introduced to these regions. High levels of clonality were common in all populations, especially in isolates sampled from the recent disease outbreak in South Africa, which were all identical. The global collection of isolates grouped into three distinct clusters, corresponding largely to their sampled regions. Low levels of genotypic diversity, high levels of clonality, and strong geographic structure suggest independent introductions into all the sampled areas from an unknown source. The results imply that strict biosecurity measures are needed to avoid introductions of additional genotypes in these areas. |
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| Keywords: | asexual reproduction foliar pathogen microsatellite markers population genetics |
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