Genetic variation in the wattle wilt pathogen Ceratocystis albofundus

Roux, Jolanda; Harrington, T. C.; Steimel, J.; Wingfield, Michael J.

doi:10.1007/bf02461214

Cited by 26 publications

(18 citation statements)

References 16 publications

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“…To test the hypothesis that C. albifundus is native to South Africa, Roux et al . (2001) determined the nuclear and mitochondrial gene diversities of this pathogen.…”

Section: Introductionmentioning

confidence: 99%

Comparison of populations of the wilt pathogen Ceratocystis albifundus in South Africa and Uganda

et al. 2005

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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 microsatellite 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.

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“…To test the hypothesis that C. albifundus is native to South Africa, Roux et al . (2001) determined the nuclear and mitochondrial gene diversities of this pathogen.…”

Section: Introductionmentioning

confidence: 99%

Comparison of populations of the wilt pathogen Ceratocystis albifundus in South Africa and Uganda

et al. 2005

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“…The fungus was Þrst discovered in South Africa in the 1980s and was initially treated as C. fimbriata (Morris et al 1993) until DNA sequence comparisons became available, and it was recognized as a discrete taxon (WingÞeld et al 1996). Population biology studies, its occurrence on several native African tree families, and reports only from Africa suggest that C. albifundus is most likely an African fungus (Roux et al 2001, Barnes et al 2005.…”

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confidence: 97%

Insect Associates ofCeratocystis albifundusand Patterns of Association in a Native Savanna Ecosystem in South Africa

et al. 2009

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Species of Ceratocystis Ellis and Halstead s.l. include important plant pathogens such as C. albifundus Morris, De Beer, and M. J. Wingfield that causes a serious wilt disease of non-native, plantation-grown Acacia mearnsii De Wild. trees in Africa. The aim of this study was to identify the insects associated with C. albifundus in South Africa and to consider the means by which the pathogen spreads. Insects were collected weekly for 77 wk in a native ecosystem using modified pitfall traps. Trapped insects were identified, and fungi were isolated using carrot baiting and by plating them onto malt extract agar. Fungi were identified using morphological characteristics and DNA sequence comparisons. Three different nitidulid (Coleoptera: Nitidulidae) beetles, Brachypeplus depressus Erichson, Carpophilus bisignatus Boheman, and Ca. hemipterus L, were collected, of which the most common were the Carpophilus spp. Two Ceratocystis spp., namely C. albifundus and C. oblonga R. N. Heath and Jolanda Roux, were isolated from all three insect species. Insect numbers and fungal isolates decreased significantly in the colder months of the year. Of the two Ceratocystis spp., C. oblonga was most abundant, occurring on 0.5% of the Carpophilus spp. C. albifundus was isolated from 1.1% of the Brachypeplus individuals and from 0.01% of the Carpophilus individuals. This study presents the first record of insects associated with C. albifundus and C. oblonga and provides an indication of environmental influences on fungal and insect populations, which could contribute to future disease management.

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“…Although the data may be considered preliminary, the diversity values found in Rondônia and Ecuador are similar to those found in a native population of C. platani from the eastern USA (Engelbrecht et al , 2004). They are also comparable to values obtained from a native population of C. albofundus in South Africa (Roux et al ., 2001) and those of a native population of C. virescens in eastern North America (Harrington et al ., 1998). All of these Ceratocystis species can produce perithecia and ascospores through selfing via unidirectional mating type switching (Harrington & McNew, 1997).…”

Section: Discussionmentioning

confidence: 99%

Genetic variation in populations of the cacao wilt pathogen, Ceratocystis cacaofunesta

et al. 2007

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Ceratocystis cacaofunesta ( = Ceratocystis fimbriata ) causes a lethal wilt disease of cacao ( Theobroma cacao ) in Latin America. Polymorphic microsatellite markers, (CAT) 5 nuclear DNA fingerprints and Hae III mitochondrial DNA fingerprints were used to compare genetic diversity among isolates of C. cacaofunesta collected from populations in western Ecuador, Costa Rica, Colombia, and Rondônia and Bahia in Brazil. Microsatellite markers and nuclear DNA fingerprints separated Ecuadorian isolates from isolates of the other four populations, and these two major groups correspond to genetic lineages already identified from ITS-rDNA sequences and intersterility groupings. Mitochondrial DNA fingerprints also demonstrated substantial diversity and split the Ecuadorian isolates into two groups. All marker types showed limited variation in the Colombian, Costa Rican and Bahian populations, as might be expected for introduced populations that have gone through recent genetic bottlenecks. In contrast, the Rondonian and western Ecuadorian populations showed gene diversity values similar to natural populations of other Ceratocystis species. The Rondonian population was the only sampled population in the native range of T. cacao (the Upper Amazon), and the putatively introduced populations were more closely related to the Rondonian population than to the western Ecuadorian population. The Ecuadorian population is in an area with other native Theobroma species, which may serve as natural hosts.

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Genetic variation in the wattle wilt pathogen Ceratocystis albofundus

Cited by 26 publications

References 16 publications

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 Uganda

Insect Associates ofCeratocystis albifundusand Patterns of Association in a Native Savanna Ecosystem in South Africa

Genetic variation in populations of the cacao wilt pathogen, Ceratocystis cacaofunesta

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