A new genus and species for the globally important, multihost root pathogen <i>Thielaviopsis basicola</i>

Nel, Wilma J.; Duong, Tuan A.; Wingfield, Brenda D.; Wingfield, Michael J.; Beer, Z. Wilhelm de

doi:10.1111/ppa.12803

Cited by 50 publications

(53 citation statements)

References 34 publications

(66 reference statements)

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“…Huntiella species are members of the family Ceratocystidaceae (Microascales, Sordariomycetes) as defined by De Beer et al (2014). This family includes 15 genera, namely Ambrosiella, Berkeleyomyces, Bretziella, Catunica, Ceratocystis, Chalaropsis, Davidsoniella, Endoconidiophora, Huntiella, Meredithiella, Phialophoropsis, Solaloca, Tielaviopsis, Toshiolenlla andWolfgangiella (De Beer et al 2014, 2017;Mayers et al 2015Mayers et al , 2020Nel et al 2018). The type species of Huntiella, H. moniliformis, was first isolated from a sweetgum (Liquidambar styraciflua) in Texas, USA (Von Schrenk 1903).…”

Section: Introductionmentioning

confidence: 99%

Novel species of Huntiella from naturally-occurring forest trees in Greece and South Africa

Liu

Marincowitz

Chen

et al. 2020

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Huntiella species are wood-infecting, filamentous ascomycetes that occur in fresh wounds on a wide variety of tree species. These fungi are mainly known as saprobes although some have been associated with disease symptoms. Six fungal isolates with typical culture characteristics of Huntiella spp. were collected from wounds on native forest trees in Greece and South Africa. The aim of this study was to identify these isolates, using morphological characters and multigene phylogenies of the rRNA internal transcribed spacer (ITS) region, portions of the β-tubulin (BT1) and translation elongation factor 1α (TEF-1α) genes. The mating strategies of these fungi were also determined through PCR amplification of mating type genes. The study revealed two new species; one from Platanus orientalis in Greece and one from Colophospermum mopane and Senegalia nigrescens in South Africa. These novel taxa have been provided with the names, H. hellenicasp. nov. and H. krugerisp. nov., respectively. The former species was found to have a homothallic and the latter a heterothallic mating system.

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Section: Introductionmentioning

confidence: 99%

Novel species of Huntiella from naturally-occurring forest trees in Greece and South Africa

Liu

Marincowitz

Chen

et al. 2020

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“…However, these morphological and biological traits have evolved more than once in the Ascomycota and phylogenetic analyses have shown that these fungi reside in two different orders, the Ophiostomatales and Microascales ( De Beer et al 2013 ). The Ophiostomatales currently accommodates a single family, the Ophiostomataceae , that includes ten genera ( Bateman et al 2017 , De Beer et al 2016a , De Beer et al 2016b , Van der Linde et al 2016 ), while the Microascales comprises of five families, of which the Ceratocystidaceae , Gondwanamycetaceae and Graphiaceae include 14 genera of ophiostomatoid fungi ( De Beer et al 2014 , 2017 , Mayers et al 2015 , Nel et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Ophiostomatoid fungi associated with conifer-infesting beetles and their phoretic mites in Yunnan, China

Chang¹,

Duong²,

Taerum³

et al. 2017

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The Ophiostomatales is an Ascomycete order of fungi that accommodates several tree pathogens and many species that degrade wood. These fungi are commonly vectored by Scolytine bark and ambrosia beetles. In recent years it has also been shown that hyperphoretic mites on these beetles can vector some Ophiostomatales. Little is known regarding the Ophiostomatales in China and we have consequently explored the diversity of these fungi associated with conifer-infesting beetles and mites in Yunnan province. Galleries and beetles were collected for 17 beetle species, while 13 mite species were obtained from six of these beetle species. Collectively, 340 fungal isolates were obtained, 45 from beetles, 184 from mites, 56 from galleries and 55 isolates where the specific niche was not clear. DNA sequences for five gene regions (ITS, LSU, BT, EF, and CAL) were determined for fungal isolates representing different morphological groups. Phylogenetic analyses confirmed the presence of 19 fungal taxa, including five novel species described here as Ophiostoma acarorum sp. nov., Ophiostoma brevipilosi sp. nov., Graphilbum kesiyae sp. nov., Graphilbum puerense sp. nov., and Leptographium ningerense sp. nov. Ophiostoma ips was the most frequently isolated species, representing approximately 31% of all isolates. Six of 19 taxa were present on mites, beetles and in the galleries of the beetles, while three species were found on mites and galleries. Two species were found only on mites and one species only on a beetle. Although the numbers of beetles and mites were insufficient to provide statistical inferences, this study confirmed that mites are important vectors of the Ophiostomatales in China. We hypothesize that these mites are most likely responsible for horizontal transfer of fungal species between galleries of different beetle species. The fact that half of the fungal species found were new to science, suggests that the forests of east Asia include many undescribed Ophiostomatales yet to be discovered.

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“…Both C. adiposa and C. norvegica are clearly placed outside of Ceratocystis s.str. but are not accommodated by any currently-defined genera ( De Beer et al 2014 , 2017 , Mayers et al 2015 , Nel et al 2017 ). Both of these species (and B. fagacearum ) have no known close relatives, and they are biologically and morphologically distinct from each other and the ambrosia beetle symbionts.…”

Section: Resultsmentioning

confidence: 99%

“…Accession numbers for newly-generated sequences and those from previous studies ( De Beer et al 2014 , Mayers et al 2015 , 2017 , 2018 , Lin et al 2017 ) are listed in Table S2 . Representatives of all major lineages in the Ceratocystidaceae were included ( De Beer et al 2014 , 2017 , Nel et al 2017 ), but a close relative of the family, Cornuvesica ( Marincowitz et al 2015 ), was not included in analyses due to inadequate sequence data. Sequences also included those of a Michigan isolate of an unnamed Microascales sp.…”

Section: Methodsmentioning

confidence: 99%

“…Despite recent phylogenetic analyses of the Ceratocystidaceae ( De Beer et al 2014 , 2017 , Mayers et al 2015 , Nel et al 2017 ) and an upswing in interest in the ambrosia symbiosis ( Hulcr & Stelinski 2017 ), the phylogenetic relationships of the ambrosia beetle symbionts to the rest of the family remains poorly resolved ( De Beer et al 2014 , Mayers et al 2015 , 2018 ). This is largely due to the difficulty of acquiring these fungi in pure culture ( Francke-Grosmann 1963 , 1967 , Batra 1985 ) and the taxonomic gaps in the known ambrosia fungi in the Ceratocystidaceae .…”

Section: Introductionmentioning

confidence: 99%

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Patterns of coevolution between ambrosia beetle mycangia and the Ceratocystidaceae, with five new fungal genera and seven new species

et al. 2020

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Ambrosia beetles farm specialised fungi in sapwood tunnels and use pocket-like organs called mycangia to carry propagules of the fungal cultivars. Ambrosia fungi selectively grow in mycangia, which is central to the symbiosis, but the history of coevolution between fungal cultivars and mycangia is poorly understood. The fungal family Ceratocystidaceae previously included three ambrosial genera (Ambrosiella, Meredithiella, and Phialophoropsis), each farmed by one of three distantly related tribes of ambrosia beetles with unique and relatively large mycangium types. Studies on the phylogenetic relationships and evolutionary histories of these three genera were expanded with the previously unstudied ambrosia fungi associated with a fourth mycangium type, that of the tribe Scolytoplatypodini. Using ITS rDNA barcoding and a concatenated dataset of six loci (28S rDNA, 18S rDNA, tef1-α, tub, mcm7, and rpl1), a comprehensive phylogeny of the family Ceratocystidaceae was developed, including Inodoromyces interjectus gen. & sp. nov., a non-ambrosial species that is closely related to the family. Three minor morphological variants of the pronotal disk mycangium of the Scolytoplatypodini were associated with ambrosia fungi in three respective clades of Ceratocystidaceae: Wolfgangiella gen. nov., Toshionella gen. nov., and Ambrosiella remansi sp. nov. Closely-related species that are not symbionts of ambrosia beetles are accommodated by Catunica adiposa gen. & comb. nov. and Solaloca norvegica gen. & comb. nov. The divergent morphology of the ambrosial genera and their phylogenetic placement among non-ambrosial genera suggest three domestication events in the Ceratocystidaceae. Estimated divergence dates for the ambrosia fungi and mycangia suggest that Scolytoplatypodini mycangia may have been the first to acquire Ceratocystidaceae symbionts and other ambrosial fungal genera emerged shortly after the evolution of new mycangium types. There is no evidence of reversion to a non-ambrosial lifestyle in the mycangial symbionts.

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A new genus and species for the globally important, multihost root pathogen Thielaviopsis basicola

Cited by 50 publications

References 34 publications

Novel species of Huntiella from naturally-occurring forest trees in Greece and South Africa

Novel species of Huntiella from naturally-occurring forest trees in Greece and South Africa

Ophiostomatoid fungi associated with conifer-infesting beetles and their phoretic mites in Yunnan, China

Patterns of coevolution between ambrosia beetle mycangia and the Ceratocystidaceae, with five new fungal genera and seven new species

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