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首页> 外文期刊>Plant Pathology >Comparison of populations of the wilt pathogen Ceratocystis albifundus in South Africa and Uganda
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Comparison of populations of the wilt pathogen Ceratocystis albifundus in South Africa and Uganda

机译：南非和乌干达的野生病原体白藻枯萎病菌种群比较

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Ceratocystis albifundus is an important fungal pathogen of Acacia mearnsii trees in South Africa.In a previous study,a high level of gene diversity was demonstrated in a South African population of C.albifundus.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.albifundus is probably native to that country.More recently,C.albifundus has been reported from A.mearnsii in south-western Uganda.The aim of this study was to compare the populations of C.albifundus from Uganda and South Africa based on genetic diversity,population structure and possible gene flow.This was achieved using codominant mic-rosatellite markers developed for the closely related species Ceratocystis fimbriata.Available isolates for comparison were from six different areas of South Africa and six jungle stands in Uganda.Eight of the 11 available markers amplified loci in C.albifundus.Gene diversity was higher in the Ugandan population,but genotypic diversity was greater for the South African isolates.There were no common genotypes between the two populations and they shared only 22% of the total alleles.The populations were genetically isolated from each other and highly substructured within.There was no association between isolates collected from the same geographic locations,and gene flow between the two populations was low.Results suggest that C.albifundus was probably not introduced into Uganda from South Africa but rather that an ancestral population,yet to be discovered,is the source of both populations.
机译：Ceratocystis albifundus是南非金合欢树的重要真菌病原体。在先前的研究中，南非C.albifundus种群表现出高水平的基因多样性。该物种及其在南非的独家发生，导致假说C.albifundus可能是该国的原产地。最近，据报道，乌干达西南部的A.mearnsii报道了C.albifundus。根据遗传多样性，种群结构和可能的基因流，比较乌干达和南非的白底念珠菌的种群数量。这是通过为紧密相关的纤毛虫（Ceratocystis fimbriata）开发的显性mic-rosatellite标记实现的。可比较的分离物来自六个不同的南非地区和乌干达的六个丛林林区.11个可用标记中的八个在C.albifundus中扩增了基因座。乌干达的基因多样性较高n个种群，但南非分离株的基因型多样性更大。两个种群之间没有共同的基因型，它们仅占总等位基因的22％。这些种群是彼此遗传分离的，并且内部高度结构化。从同一地理位置收集的分离株之间的关联性低，并且两个种群之间的基因流低。结果表明，C.albifundus可能不是从南非引入乌干达，而是一个尚待发现的祖先种群两种人群中

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