Three new Europhium species with <i>Verticicladiella</i> imperfect states on blue-stained pine

Robinson-Jeffrey, Robena C.; Davidson, Ross W.

doi:10.1139/b68-210

Cited by 52 publications

(25 citation statements)

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“…The studied morphological characters from cultures grown in MEA included the colony color and the shape of its margin, as well as the microscopic characters of the conidiophore production region and conidia type from these and the phloem chip cultures. These characters were compared to published descriptions [55][56][57][58][59]. The fungi were sampled from all MPBs and a subsample of beetles was selected to sample the hyperphoretic fungi on their phoretic mites.…”

Section: The Sampling and Identification Of The Studied Organismmentioning

confidence: 99%

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

Mercado

Ortiz-Santana

Kay

2018

Forests

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Abstract:The mite and fungal biota associated with the mountain pine beetle (MPB) (Dendroctonus ponderosae Hopk.) may not be stable throughout an irruptive event. In congeneric beetles, variations in the frequency of their associated organisms affect population trends and similar effects may occur in MPB. We studied fungi and mite trends in a declining irruptive MPB population as it attacked three different pine hosts in the Colorado Front Range. During the study, we found two new associates including one biologically relevant mite and one beneficial blue-stain fungus. Fungi hyperphoretic on mites were also documented. This included beneficial and potentially detrimental species to the MPB. The frequency of several organisms varied between some years or pine hosts but not within male or female beetles. A large increase of Trichouropoda sp. and T. ips mites trended inversely with the declining beetle population, while a decrease in the beneficial blue-stain fungi trended similarly to the declining beetle population. We discuss the interactions and potential effects of phoretic biota in relation to (1) the MPB associates' population trends, (2) the MPB incursions into cooler areas, and (3) the redundancy of blue-stain fungi carried by the MPB holobiont. These findings increase our knowledge of the mechanisms that influence MPB populations.

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Section: The Sampling and Identification Of The Studied Organismmentioning

confidence: 99%

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

Mercado

Ortiz-Santana

Kay

2018

Forests

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“…In addition to the girdling action of larvae, blue-stain fungi-CeratostomelZa montia (Rumbold, 1941) and Europhium cZavigerum (Robinson-Jeffrey and Davidson, 1968)-are introduced by adult beetles and have been considered the primary cause of tree death (Safranyik et al, 1974). Fungal spores which probably are picked up during maturation feeding by the new adult are carried in a maxillary mycangium (Whitney and Farris, 1970), indicating a true symbiotic relationship of fungus and beetle.…”

Section: The Mountain Pine Beetlementioning

confidence: 99%

The Role of the Mountain Pine Beetle in Lodgepole Pine Ecosystems: Impact on Succession

Amman¹

1977

Proceedings in Life Sciences

107

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“…Over the last 10 years, we and others have shown that the microflora associated with the mountain pine beetle (MPB) is more diverse than originally reported (9,37). MPBs carry multiple Ophiostomatales fungal species, including G. clavigera (which consists of the two cryptic species Gc and Gs) (14,15), Leptographium longiclavatum, Ophiostoma montium, and Ceratocystiopsis (37,38).…”

Section: Resultsmentioning

confidence: 91%

“…Historically, Grosmannia clavigera, a member of the Ophiostomatales in the Ascomycota, has been shown to be symbiotically associated with both the MPB and its sibling the Jeffrey pine beetle (JPB) (9,10). While MPB can colonize different pine species, it does not infest Pinus jeffreyi, which is the only known host of the JPB.…”

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confidence: 99%

Gene Discovery for Enzymes Involved in Limonene Modification or Utilization by the Mountain Pine Beetle-Associated Pathogen Grosmannia clavigera

Wang

Lim

Madilao

et al. 2014

Appl Environ Microbiol

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bTo successfully colonize and eventually kill pine trees, Grosmannia clavigera (Gs cryptic species), the main fungal pathogen associated with the mountain pine beetle (Dendroctonus ponderosae), has developed multiple mechanisms to overcome host tree chemical defenses, of which terpenoids are a major component. In addition to a monoterpene efflux system mediated by a recently discovered ABC transporter, Gs has genes that are highly induced by monoterpenes and that encode enzymes that modify or utilize monoterpenes [especially (؉)-limonene]. We showed that pine-inhabiting Ophiostomale fungi are tolerant to monoterpenes, but only a few, including Gs, are known to utilize monoterpenes as a carbon source. Gas chromatography-mass spectrometry (GC-MS) revealed that Gs can modify (؉)-limonene through various oxygenation pathways, producing carvone, p-mentha-2,8-dienol, perillyl alcohol, and isopiperitenol. It can also degrade (؉)-limonene through the C-1-oxygenated pathway, producing limonene-1,2-diol as the most abundant intermediate. Transcriptome sequencing (RNA-seq) data indicated that Gs may utilize limonene 1,2-diol through beta-oxidation and then valine and tricarboxylic acid (TCA) metabolic pathways. The data also suggested that at least two gene clusters, located in genome contigs 108 and 161, were highly induced by monoterpenes and may be involved in monoterpene degradation processes. Further, gene knockouts indicated that limonene degradation required two distinct Baeyer-Villiger monooxygenases (BVMOs), an epoxide hydrolase and an enoyl coenzyme A (enoyl-CoA) hydratase. Our work provides information on enzyme-mediated limonene utilization or modification and a more comprehensive understanding of the interaction between an economically important fungal pathogen and its host's defense chemicals.

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Three new Europhium species with Verticicladiella imperfect states on blue-stained pine

Cited by 52 publications

References 0 publications

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

The Role of the Mountain Pine Beetle in Lodgepole Pine Ecosystems: Impact on Succession

Gene Discovery for Enzymes Involved in Limonene Modification or Utilization by the Mountain Pine Beetle-Associated Pathogen Grosmannia clavigera

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