Population structure of <Emphasis Type="Italic">Cylindrocladium parasiticum</Emphasis> infecting peanuts (<Emphasis Type="Italic">Arachis hypogaea</Emphasis>) in Georgia,USA |
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Authors: | Louwrance P Wright Andrew J Davis Brenda D Wingfield Pedro W Crous Tim Brenneman Michael J Wingfield |
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Institution: | (1) Present address: Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knoell-Strasse 8, 07745 Jena, Germany;(2) Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa;(3) Centraalbureau voor Schimmelcultures (CBS), P.O. Box 85167, 3508 Ad Utrecht, The Netherlands;(4) Department of Plant Pathology, CPES, University of Georgia, Tifton, GA 31794, USA |
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Abstract: | Cylindrocladium parasiticum is an important pathogen of peanut (Arachis hypogaea) causing the disease Cylindrocladium black rot. The genetic structure of this haploid pathogen was determined for populations
associated with peanut in Georgia, USA. Ten polymorphic microsatellite markers were used to determine genetic and genotypic
diversity among three sub-populations representing the geographic distribution of peanut production in Georgia. Among 200
isolates collected, only 10 unique multilocus haplotypes were identified, with one multilocus haplotype occurring 176 times.
Although no evidence for random mating was observed, the existence of loops in a constructed haplotype network hint at the
possibility of recombination events. The absence of random mating might therefore be attributed to the homothallic nature
of C. parasiticum as well as the clonality of the population, without excluding the possible occurrence of recombination. Cylindrocladium parasiticum thus appears to consist of a genetically homogeneous population throughout Georgia with mainly clonal reproduction or inbreeding
contributing to the observed population genetic structure. |
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