Pesotum australisp. nov. andOphiostoma quercusassociated withAcacia mearnsiitrees in Australia and Uganda, respectively

Nkuekam, Gilbert Kamgan; Jacobs, Karin; Beer, Z. Wilhelm de; Wingfield, Michael J.; Roux, Jolanda

doi:10.1071/ap08027

Cited by 18 publications

(28 citation statements)

References 29 publications

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“…(De Beer et al 2003a, b). This species is a ubiquitous sapstain fungus primarily occurring on hardwoods, and to a lesser extent on conifers, with a global distribution (Brasier and Kirk 1993;Harrington et al 2001;Geldenhuis et al 2004;Thwaites et al 2004;Zhou et al 2004;Kamgan et al 2008;Linnakoski et al 2008;Nkuekam et al 2008). The first confirmed reports of O. quercus from east Asia were published only during the past decade (De Beer et al 2003b;Lin et al 2003;Kim et al 2005;Chung et al 2006;Masuya et al 2009;Paciura et al 2010).…”

Section: Introductionmentioning

confidence: 76%

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Discovery of Ophiostoma tsotsi on Eucalyptus wood chips in China

et al. 2011

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Ophiostoma species such as O. quercus are the most frequent causal agents of sapstain of freshly felled hardwood timber and pulpwood. Many species are regarded as economically important agents of wood degradation. The aim of this study was to identify a collection of Ophiostoma isolates, resembling O. quercus, found on stained Eucalyptus pulpwood chips in China. DNA sequences of the internal transcribed spacer regions, including the 5.8S region, of the ribosomal DNA, and parts of the β-tubulin and elongation factor-1α genes, revealed that the isolates were not O. quercus. Surprisingly, they represented O. tsotsi, a wound-infesting fungus recently described from hardwoods in Africa. In addition, sequence data from an isolate from agarwood in Vietnam, identified in a previous study as belonging to an unknown Pesotum species, were also shown to represent O. tsotsi. A high level of genetic variability was observed among isolates of both O. quercus and O. tsotsi. This was unexpected and suggests that both species have been present in Asia for a significant amount of time.

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Section: Introductionmentioning

confidence: 76%

“…(Nkuekam et al 2008), O. denticiliatum (Linnakoski et al 2009), and O. tsotsi (Grobbelaar et al 2010). However, none of the Chinese isolates produced a teleomorph and none of the isolates could be conclusively assigned to any of the above mentioned four species based on phenotypic characters.…”

Section: Culture and Anamorph Morphologymentioning

confidence: 99%

Discovery of Ophiostoma tsotsi on Eucalyptus wood chips in China

et al. 2011

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“…Related to the DED fungi is Ophiostoma quercus, a ubiquitous species reported most frequently from recent inventories of bark beetle associates [6][7][8][9][10][11], fungi isolated from wounds on trees [12][13][14][15], and stained wood products [16][17][18][19][20][21]. Understanding the population biology and origin of O. quercus will greatly assist in risk assessments and the formulation of appropriate quarantine measures.…”

Section: Introductionmentioning

confidence: 99%

Ophiostoma tsotsi sp. nov., A Wound-infesting Fungus of Hardwood Trees in Africa

et al. 2010

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Polymorphic sequence-characterised marker assays from a recent diversity study on the Ascomycete fungus Ophiostoma quercus reported that some isolates from Africa were genetically distinct from O. quercus. In the present study, these African isolates were compared with authentic O. quercus isolates by evaluating morphological characters, growth in culture, mating compatibility and DNA sequence data. The isolates from Africa were morphologically similar to O. quercus, presenting Pesotum and Sporothrix synanamorphs in culture. Phylogenetic analyses of the ribosomal internal transcribed spacer regions 1 and 2, b-tubulin and translation elongation factor 1-a gene regions confirmed that the African group represents a distinct species within the hardwood lineage of the O. piceae complex, closely related to O. ulmi and O. himalulmi. Mating studies between O. quercus and the African isolates showed that isolates mated predominantly with those of their own group, although there were rare cases of fertile crosses between the groups. Isolates residing in the African lineage are described here as a new species, O. tsotsi sp. nov.

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“…The PCR reaction mixtures as well as the thermal cycling used in this study were the same as described previously (Kamgan Nkuekam et al 2008a). An aliquot of 5 µl of the PCR products were stained with GelRed TM Nucleic Acid Gel stain (Biotium, Hayward, CA, USA), separated on a 1% agarose gel and visualized under UV light.…”

mentioning

confidence: 99%

“…Isolation and purification of fungi from wood samples followed the same protocols described by Kamgan Nkuekam et al (2008a). Nitidulid beetles not retained for species identification were used to determine the presence of Ceratocystis species on their bodies.…”

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confidence: 99%

Ceratocystis species, including two new species associated with nitidulid beetles, on eucalypts in Australia

Nkuekam

Wingfield

Mohammed

et al. 2011

Antonie van Leeuwenhoek

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The genus Ceratocystis includes important fungal pathogens of trees, including Eucalyptus spp.Ironically, very little is known regarding the diversity or biology of Ceratocystis species on Eucalyptus species in Australia, where most of these trees are native. The aim of this study was to survey for Ceratocystis spp., and their possible insect associates on eucalypts in Australia and thus, to establish a foundation of knowledge regarding these fungi on the continent.Collections were made in three states of Australia from wounds on trees, as well as from nitidulid beetles associated with these wounds. Ceratocystis spp. were identified based on morphology and multigene sequence comparisons. Of the 54 isolates obtained, two previously unknown species of Ceratocystis were found and these are described here as C. corymbiicola sp. nov. and C. tyalla sp. nov. Furthermore, the distribution of C. pirilliformis is expanded to include Eucalyptus spp. in Tasmania.

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Pesotum australisp. nov. andOphiostoma quercusassociated withAcacia mearnsiitrees in Australia and Uganda, respectively

Cited by 18 publications

References 29 publications

Discovery of Ophiostoma tsotsi on Eucalyptus wood chips in China

Discovery of Ophiostoma tsotsi on Eucalyptus wood chips in China

Ophiostoma tsotsi sp. nov., A Wound-infesting Fungus of Hardwood Trees in Africa

Ceratocystis species, including two new species associated with nitidulid beetles, on eucalypts in Australia

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