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Search Results (5)

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Keywords = Ceratocystiopsis

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11 pages, 5042 KiB  
Article
Ophiostomatalean Fungi (Ascomycota, Ophiostomatales) Associated with Dendroctonus valens in Liaoning, China
by Zheng Wang, Lingyu Liang, Shuo Yan, Huimin Wang and Quan Lu
Forests 2025, 16(2), 299; https://doi.org/10.3390/f16020299 - 9 Feb 2025
Viewed by 798
Abstract
The red turpentine beetle Dendroctonus valens is an invasive forest pest that has been rapidly spreading northward since its introduction in China. Some ophiostomatalean associates of D. valens are essential contributing factors for this beetle to become an aggressive pine killer in China. [...] Read more.
The red turpentine beetle Dendroctonus valens is an invasive forest pest that has been rapidly spreading northward since its introduction in China. Some ophiostomatalean associates of D. valens are essential contributing factors for this beetle to become an aggressive pine killer in China. In this study, a survey was conducted in a new invasive area of this beetle’s habitat in Liaoning Province. A total of 126 ophiostomatalean fungal associates of D. valens were isolated. Based on the combination of morphological characteristics and phylogeny, these isolates were identified as Ceratocystiopsis jianpingensis sp. nov., along with two new records, Leptographium terebrantis and Ophiostoma gilletteae. Ophiostoma gilletteae was the dominant species, with an isolation rate of 85.7%. The results of this study show that more shared ophiostomatalean fungi are associated with D. valens in China and North America, and accumulate resources for the development of fungal associate-mediated bark beetle management strategies. Full article
(This article belongs to the Special Issue Forest Pests and Pathogens—The Need for a Global Strategy)
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12 pages, 2307 KiB  
Article
Ophiostomatales Associated with Mediterranean Pine Engraver, Orthotomicus erosus (Coleoptera, Curculionidae) in Dalmatia, Croatia
by Marta Kovač, Daniel Rigling and Milan Pernek
J. Fungi 2022, 8(8), 788; https://doi.org/10.3390/jof8080788 - 28 Jul 2022
Cited by 4 | Viewed by 2673
Abstract
Mediterranean pine engraver, Orthotomicus erosus was never considered as a significant pest in Croatia and did not appear in high population densities until 2017, when it reached outbreak level in Aleppo pine stands. The beetle was first detected in Marjan Forest Park, Split, [...] Read more.
Mediterranean pine engraver, Orthotomicus erosus was never considered as a significant pest in Croatia and did not appear in high population densities until 2017, when it reached outbreak level in Aleppo pine stands. The beetle was first detected in Marjan Forest Park, Split, and was soon recorded in other parts of the Dalmatian coast. Soon after the outbreak occurred, we observed that all of the attacked trees exhibit severe blue staining in the sapwood which indicated fungal infection caused by the Ophiostomatales group of fungi. This raised the need to investigate their relationship with O. erosus and the pine decline, and the main aim of this study was to isolate and identify them. Isolates were obtained from adult O. erosus beetles, their galleries, and blue-stained sapwood, and identified according to the morphological characteristics and DNA sequencing. A total of six Ophiostomatales (Ophiostoma ips, O. piceae, Graphilbum cf. rectangulosporium, O. floccosum, Sporothrix pseudoabietina and Ceratocystiopsis cf. minuta) were identified in the study. This is the first record of Ophiostomatales as organisms associated with the pest O. erosus and pine species in Croatia. Full article
(This article belongs to the Special Issue Plant Fungal Pathogens: Isolation, Characterization and Control Strategies)
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17 pages, 3077 KiB  
Article
Ceratocystiopsis quercina sp. nov. Associated with Platypus cylindrus on Declining Quercus suber in Portugal
by Maria L. Inácio, José Marcelino, Arlindo Lima, Edmundo Sousa and Filomena Nóbrega
Biology 2022, 11(5), 750; https://doi.org/10.3390/biology11050750 - 13 May 2022
Cited by 7 | Viewed by 3018
Abstract
Platypus cylindrus is the most common ambrosia beetle in stands of Quercus suber in Portugal. This insect farms specialized fungi in sapwood galleries, using its mycangia to carry and store these organisms. Some ectosymbiotic fungi carried by P. cylindrus are phytopathogenic and cause [...] Read more.
Platypus cylindrus is the most common ambrosia beetle in stands of Quercus suber in Portugal. This insect farms specialized fungi in sapwood galleries, using its mycangia to carry and store these organisms. Some ectosymbiotic fungi carried by P. cylindrus are phytopathogenic and cause extensive tree mortality and severe economic losses. To understand the role of P. cylindrus fungal symbionts in stands of Q. suber we examined beetle galleries present in declining and/or dying cork oak trees during field surveys. Logs with active galleries were obtained in situ and from captured emerging beetles. Insects were aseptically dissected, and their mycangia and intestine were retrieved. Morphological and molecular profiles of fungal isolates obtained from cultured insect parts were carried out to accurately characterize and identify isolated fungi. Molecular characterizations were performed with DNA sequence data from four loci, i.e., LSU, SSU, 5.8S-ITS2-28S, and TUB. Morphological results consistently showed a collection of Ophiostoma-like fungal axenic isolates, while phylogenies inferred that this collection constitutes an undescribed taxon reported herein for the first time in association with P. cylindrus in Portuguese cork oak stands. The novel species was erected as Ceratocystiopsis quercina sp. nov. and constitutes a new phytopathogenic fungal species associated with symptoms of vegetative cork oak decline. Full article
(This article belongs to the Special Issue Recent Advances in Molecular Genetics of Plant-Microbe Interactions)
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10 pages, 1967 KiB  
Article
Morphological and Phylogenetic Analyses Reveal a New Species of Ceratocystiopsis (Ophiostomataceae, Ophiostomatales) Associated with Ips subelongatus in Inner Mongolia (China) with Weak Host Pathogenicity
by Zheng Wang, Ya Liu, Caixia Liu, Zhenyu Liu, Lijun Liang and Quan Lu
Forests 2021, 12(12), 1795; https://doi.org/10.3390/f12121795 - 17 Dec 2021
Cited by 5 | Viewed by 2859
Abstract
Ophiostomatoid fungi are known for their associations with bark beetles, and some species are important sources of tree diseases. Ceratocystiopsis is a genus of the ophiostomatoid fungi in order Ophiostomatales. The shortage of DNA barcodes for many species in this genus has [...] Read more.
Ophiostomatoid fungi are known for their associations with bark beetles, and some species are important sources of tree diseases. Ceratocystiopsis is a genus of the ophiostomatoid fungi in order Ophiostomatales. The shortage of DNA barcodes for many species in this genus has resulted in the presence of many unnamed cryptic species. In this study, Ceratocystiopsis subelongati sp. nov. associated with Ips subelongatus infesting Pinus sylvestris var. mongolica in Inner Mongolia, China, was identified and described based on phylogenetic inference of multi-gene DNA sequences and morphological characteristics. The species is characterized by a hyalorhinocladiella- to sporothrix-like asexual state and an optimal growth temperature of 30 °C. Artificial inoculation tests in the field showed that it is mildly pathogenic to five-year-old larch trees, the main host of I. subelongatus. It is also the first described Ceratocystiopsis species associated with I. subelongatus in China. This discovery should provide new avenues for studying the symbiosis between bark beetles and ophiostomatoid fungi. Full article
(This article belongs to the Special Issue Forest Pathology and Entomology—Series II)
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28 pages, 2853 KiB  
Review
Ecological and Evolutionary Determinants of Bark Beetle —Fungus Symbioses
by Diana L. Six
Insects 2012, 3(1), 339-366; https://doi.org/10.3390/insects3010339 - 22 Mar 2012
Cited by 229 | Viewed by 20335
Abstract
Ectosymbioses among bark beetles (Curculionidae, Scolytinae) and fungi (primarily ophiostomatoid Ascomycetes) are widespread and diverse. Associations range from mutualistic to commensal, and from facultative to obligate. Some fungi are highly specific and associated only with a single beetle species, while others can be [...] Read more.
Ectosymbioses among bark beetles (Curculionidae, Scolytinae) and fungi (primarily ophiostomatoid Ascomycetes) are widespread and diverse. Associations range from mutualistic to commensal, and from facultative to obligate. Some fungi are highly specific and associated only with a single beetle species, while others can be associated with many. In addition, most of these symbioses are multipartite, with the host beetle associated with two or more consistent partners. Mycangia, structures of the beetle integument that function in fungal transport, have evolved numerous times in the Scolytinae. The evolution of such complex, specialized structures indicates a high degree of mutual dependence among the beetles and their fungal partners. Unfortunately, the processes that shaped current day beetle-fungus symbioses remain poorly understood. Phylogeny, the degree and type of dependence on partners, mode of transmission of symbionts (vertical vs. horizontal), effects of the abiotic environment, and interactions among symbionts themselves or with other members of the biotic community, all play important roles in determining the composition, fidelity, and longevity of associations between beetles and their fungal associates. In this review, I provide an overview of these associations and discuss how evolution and ecological processes acted in concert to shape these fascinating, complex symbioses. Full article
(This article belongs to the Special Issue Symbiosis: A Source of Evolutionary Innovation in Insects)
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