There was no association between isolates collected from the same geographic locations, and gene flow between the two populations was low. The populations were genetically isolated from each other and highly substructured within. There were no common genotypes between the two populations and they shared only 22% of the total alleles. Gene diversity was higher in the Ugandan population, but genotypic diversity was greater for the South African isolates. Eight of the 11 available markers amplified loci in C. Available isolates for comparison were from six different areas of South Africa and six jungle stands in Uganda. This was achieved using codominant microsatellite markers developed for the closely related species Ceratocystis fimbriata. The average frequency of null alleles among populations varied from 0.0790.082, according to the expectation maximization method, except for Puerto Peñasco (0.144). albifundus from Uganda and South Africa based on genetic diversity, population structure and possible gene flow. The other loci showed deviations at one or a maximum of two populations, and null allele frequencies that ranged from 0.0440.276. The aim of this study was to compare the populations of C. albifundus is probably native to that country. This, together with the occurrence of the pathogen on native Protea species and its exclusive occurrence in South Africa, led to the hypothesis that C. In a previous study, a high level of gene diversity was demonstrated in a South African population of C. J.Ĭeratocystis albifundus is an important fungal pathogen of Acacia mearnsii trees in South Africa. Comparison of populations of the wilt pathogen Ceratocystis albifundus in South Africa and Uganda Comparison of populations of the wilt pathogen Ceratocystis albifundus in South Africa and Ugandaīarnes, I.
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