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Birkemoe T, Jacobsen RM, Sverdrup-Thygeson A, Biedermann PHW. Insect-Fungus Interactions in Dead Wood Systems. SAPROXYLIC INSECTS 2018. [DOI: 10.1007/978-3-319-75937-1_12] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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52
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Arcila Hernández LM, Sanders JG, Miller GA, Ravenscraft A, Frederickson ME. Ant-plant mutualism: a dietary by-product of a tropical ant's macronutrient requirements. Ecology 2017; 98:3141-3151. [DOI: 10.1002/ecy.2036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 09/08/2017] [Accepted: 09/14/2017] [Indexed: 12/27/2022]
Affiliation(s)
- Lina M. Arcila Hernández
- Department of Ecology & Evolutionary Biology; University of Toronto; 25 Willcocks Street Toronto Ontario M5S 3B2 Canada
| | - Jon G. Sanders
- Department of Organismic & Evolutionary Biology; Harvard University; 26 Oxford Street Cambridge Massachusetts 02138 USA
| | - Gabriel A. Miller
- Department of Organismic & Evolutionary Biology; Harvard University; 26 Oxford Street Cambridge Massachusetts 02138 USA
| | - Alison Ravenscraft
- Department of Organismic & Evolutionary Biology; Harvard University; 26 Oxford Street Cambridge Massachusetts 02138 USA
| | - Megan E. Frederickson
- Department of Ecology & Evolutionary Biology; University of Toronto; 25 Willcocks Street Toronto Ontario M5S 3B2 Canada
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53
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Cale JA, Muskens M, Najar A, Ishangulyyeva G, Hussain A, Kanekar SS, Klutsch JG, Taft S, Erbilgin N. Rapid monoterpene induction promotes the susceptibility of a novel host pine to mountain pine beetle colonization but not to beetle-vectored fungi. TREE PHYSIOLOGY 2017; 37:1597-1610. [PMID: 28985375 DOI: 10.1093/treephys/tpx089] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 06/21/2017] [Indexed: 06/07/2023]
Abstract
Chemical induction can drive tree susceptibility to and host range expansions of attacking insects and fungi. Recently, mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) has expanded its host range from its historic host lodgepole pine (Pinus contorta var. latifolia Douglas ex Loudon) to jack pine (Pinus banksiana Lamb) in western Canada. Beetle success in jack pine forests likely depends upon the suitability of tree chemistry to MPB and its symbiotic phytopathogenic fungi. In particular, how rapid induced defenses of jack pine affect MPB colonization and the beetle's symbionts is unknown. In the field, we characterized and compared differences in rapid induced phloem monoterpenes between lodgepole and jack pines in response to various densities of Grosmannia clavigera (Robinson-Jeffery and Davidson)-a MPB symbiotic fungus used to simulate beetle attack-inoculations. Overall, lodgepole pine had higher limonene and myrcene, but lower α-pinene, concentrations than jack pine. However, myrcene concentrations in jack pine increased with inoculation density, while that in lodgepole pine did not respond to density treatments. We compared the growth and reproduction of MPB's symbiotic fungi, G. clavigera, Ophiostoma montium (Rumford) von Arx and Leptographium longiclavatum Lee, Kim and Breuil, grown on media amended with myrcene, α-pinene and limonene at concentrations reflecting two induction levels from each pine species. Myrcene and α-pinene amendments inhibited the growth but stimulated the reproduction of G. clavigera, whereas limonene stimulated its growth while inhibiting its reproduction. However, the growth and reproduction of the other fungi were generally stimulated by monoterpene amendments. Overall, our results suggest that jack pine rapid induction could promote MPB aggregation due to high levels of α-pinene (pheromone precursor), a positive feedback of myrcene (pheromone synergist) and low levels of limonene (resistance). Jack pine is likely as susceptible to MPB-vectored fungi as lodgepole pine, indicating that jack pine induction will likely not adversely affect symbiont activities enough to inhibit the invasion of MPB into jack pine forests.
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Affiliation(s)
- Jonathan A Cale
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Marlena Muskens
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Ahmed Najar
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Guncha Ishangulyyeva
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Altaf Hussain
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Sanat S Kanekar
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Jennifer G Klutsch
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Spencer Taft
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
| | - Nadir Erbilgin
- Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada
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54
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Doremus MR, Smith AH, Kim KL, Holder AJ, Russell JA, Oliver KM. Breakdown of a defensive symbiosis, but not endogenous defences, at elevated temperatures. Mol Ecol 2017; 27:2138-2151. [DOI: 10.1111/mec.14399] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 10/17/2017] [Indexed: 02/05/2023]
Affiliation(s)
| | | | - Kyungsun L. Kim
- Department of Entomology University of Georgia Athens GA USA
| | | | | | - Kerry M. Oliver
- Department of Entomology University of Georgia Athens GA USA
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55
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Isolation of Serratia marcescens involved in chitin degradation in the bulb mite Rhizoglyphus robini. Symbiosis 2017. [DOI: 10.1007/s13199-017-0483-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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56
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Jimenez SI, Carroll C, Babcock T, Derstine N, Hadwin A, Moore M, Gries G. Yeasts Harbored by Vespine Wasps in the Pacific Northwest. ENVIRONMENTAL ENTOMOLOGY 2017; 46:217-225. [PMID: 28169397 DOI: 10.1093/ee/nvw173] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 12/14/2016] [Indexed: 06/06/2023]
Abstract
The ecological role of social wasps has been extensively studied, but little is known about symbiotic relationships of these wasps with microbes. Recently, it was shown that vespid wasps in Europe carry yeasts, predominantly Saccharomyces cerevisiae, in their gastrointestinal (GI) tract. Interestingly, this niche allowed for sexual recombination of yeasts to occur and the formation of novel hybrid species. Our goals were 1) to survey the GI tract of eusocial wasps in the Pacific Northwest for the presence of yeasts and 2) to compare the diversity of such yeasts to that described for wasps in Europe. The GI tracts of 19 individual wasps from five species were plated, and 27 yeast-like colonies were identified to the species level. Yeasts in the genera Lachancea and Hanseniaspora each comprised ∼30% of the isolates; ∼25% were identified as Metschnikowia spp., with the remaining 10% belonging to Rhodotorula. Four bacterial isolates were identified as Escherichia coli, Enterococcus faecalis, and two isolates of Stenotrophomonas maltophilia. Yeasts were present at all life stages of the wasps except for two unfed gynes of Dolichovespula maculata (L.) that contained only bacteria. The presence of a particular yeast species was not correlated with any wasp species. Furthermore, S. cerevisiae was not found in any wasp species. This highlights an interesting difference in the life cycle of both S. cerevisiae and wasps in Europe and the Pacific Northwest, and prompts further studies on the interactions of these microbes with their host wasps.
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Affiliation(s)
- Sebastian Ibarra Jimenez
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
| | - Cassandra Carroll
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
| | - Tamara Babcock
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
| | - Nathan Derstine
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
| | - Alison Hadwin
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
| | - Margo Moore
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
| | - Gerhard Gries
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada (; ; ; ; ; ; )
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57
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Ojeda Alayon DI, Tsui CKM, Feau N, Capron A, Dhillon B, Zhang Y, Massoumi Alamouti S, Boone CK, Carroll AL, Cooke JEK, Roe AD, Sperling FAH, Hamelin RC. Genetic and genomic evidence of niche partitioning and adaptive radiation in mountain pine beetle fungal symbionts. Mol Ecol 2017; 26:2077-2091. [PMID: 28231417 DOI: 10.1111/mec.14074] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Revised: 12/08/2016] [Accepted: 02/09/2017] [Indexed: 12/19/2022]
Abstract
Bark beetles form multipartite symbiotic associations with blue stain fungi (Ophiostomatales, Ascomycota). These fungal symbionts play an important role during the beetle's life cycle by providing nutritional supplementation, overcoming tree defences and modifying host tissues to favour brood development. The maintenance of stable multipartite symbioses with seemingly less competitive symbionts in similar habitats is of fundamental interest to ecology and evolution. We tested the hypothesis that the coexistence of three fungal species associated with the mountain pine beetle is the result of niche partitioning and adaptive radiation using SNP genotyping coupled with genotype-environment association analysis and phenotypic characterization of growth rate under different temperatures. We found that genetic variation and population structure within each species is best explained by distinct spatial and environmental variables. We observed both common (temperature seasonality and the host species) and distinct (drought, cold stress, precipitation) environmental and spatial factors that shaped the genomes of these fungi resulting in contrasting outcomes. Phenotypic intraspecific variations in Grosmannia clavigera and Leptographium longiclavatum, together with high heritability, suggest potential for adaptive selection in these species. By contrast, Ophiostoma montium displayed narrower intraspecific variation but greater tolerance to extreme high temperatures. Our study highlights unique phenotypic and genotypic characteristics in these symbionts that are consistent with our hypothesis. By maintaining this multipartite relationship, the bark beetles have a greater likelihood of obtaining the benefits afforded by the fungi and reduce the risk of being left aposymbiotic. Complementarity among species could facilitate colonization of new habitats and survival under adverse conditions.
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Affiliation(s)
- Dario I Ojeda Alayon
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Clement K M Tsui
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Nicolas Feau
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Arnaud Capron
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Braham Dhillon
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Yiyuan Zhang
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Sepideh Massoumi Alamouti
- Department of Wood Science, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Celia K Boone
- Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, BC, Canada, V2N 4Z9
| | - Allan L Carroll
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4
| | - Janice E K Cooke
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada, T6G 2R3
| | - Amanda D Roe
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada, T6G 2R3.,Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen St E, Sault Ste. Marie, ON, Canada, P6A 2E5
| | - Felix A H Sperling
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada, T6G 2R3
| | - Richard C Hamelin
- Department of Forest and Conservation Sciences, The University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada, V6T 1Z4.,Institut de Biologie Intégrative des Systèmes, Université Laval, 1030 Avenue de la Médecine, Québec City, QC, Canada, G1V 0A6
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58
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Lu M, Hulcr J, Sun J. The Role of Symbiotic Microbes in Insect Invasions. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2016. [DOI: 10.1146/annurev-ecolsys-121415-032050] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Min Lu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China;
| | - Jiri Hulcr
- School of Forest Resources and Conservation and the Entomology and Nematology Department, University of Florida, Gainesville, Florida 32611
| | - Jianghua Sun
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China;
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59
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Cheng C, Xu L, Xu D, Lou Q, Lu M, Sun J. Does cryptic microbiota mitigate pine resistance to an invasive beetle-fungus complex? Implications for invasion potential. Sci Rep 2016; 6:33110. [PMID: 27621032 PMCID: PMC5020614 DOI: 10.1038/srep33110] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 08/18/2016] [Indexed: 01/24/2023] Open
Abstract
Microbial symbionts are known to assist exotic pests in their colonization of new host plants. However, there has been little evidence linking symbiotic invasion success to mechanisms for mitigation of native plant resistance. The red turpentine beetle (RTB) was introduced with a fungus, Leptographium procerum, to China from the United States and became a destructively invasive symbiotic complex in natural Pinus tabuliformis forests. Here, we report that three Chinese-resident fungi, newly acquired by RTB in China, induce high levels of a phenolic defensive chemical, naringenin, in pines. This invasive beetle-fungus complex is suppressed by elevated levels of naringenin. However, cryptic microbiotas in RTB galleries strongly degrade naringenin, and pinitol, the main soluble carbohydrate of P. tabuliformis, is retained in L. procerum-infected phloem and facilitate naringenin biodegradation by the microbiotas. These results demonstrate that cryptic microbiota mitigates native host plant phenolic resistance to an invasive symbiotic complex, suggesting a putative mechanism for reduced biotic resistance to symbiotic invasion.
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Affiliation(s)
- Chihang Cheng
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- College of Life Sciences, Huzhou University, Huzhou, 313000, China
| | - Letian Xu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, 300457, China
| | - Dandan Xu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qiaozhe Lou
- Technical Center, Hebei Entry-Exit Inspection and Quarantine Bureau, Shijiazhuang, 050051, China
| | - Min Lu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jianghua Sun
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
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60
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Cale JA, Collignon RM, Klutsch JG, Kanekar SS, Hussain A, Erbilgin N. Fungal Volatiles Can Act as Carbon Sources and Semiochemicals to Mediate Interspecific Interactions Among Bark Beetle-Associated Fungal Symbionts. PLoS One 2016; 11:e0162197. [PMID: 27583519 PMCID: PMC5008770 DOI: 10.1371/journal.pone.0162197] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 08/18/2016] [Indexed: 11/18/2022] Open
Abstract
Mountain pine beetle (Dendroctonus ponderosae) has killed millions of hectares of pine forests in western North America. Beetle success is dependent upon a community of symbiotic fungi comprised of Grosmannia clavigera, Ophiostoma montium, and Leptographium longiclavatum. Factors regulating the dynamics of this community during pine infection are largely unknown. However, fungal volatile organic compounds (FVOCs) help shape fungal interactions in model and agricultural systems and thus may be important drivers of interactions among bark beetle-associated fungi. We investigated whether FVOCs can mediate interspecific interactions among mountain pine beetle's fungal symbionts by affecting fungal growth and reproduction. Headspace volatiles were collected and identified to determine species-specific volatile profiles. Interspecific effects of volatiles on fungal growth and conidia production were assessed by pairing physically-separated fungal cultures grown either on a carbon-poor or -rich substrate, inside a shared-headspace environment. Fungal VOC profiles differed by species and influenced the growth and/or conidia production of the other species. Further, our results showed that FVOCs can be used as carbon sources for fungi developing on carbon-poor substrates. This is the first report demonstrating that FVOCs can drive interactions among bark beetle fungal symbionts, and thus are important factors in beetle attack success.
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Affiliation(s)
- Jonathan A Cale
- Department of Renewable Resources, 4-42 Earth Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
| | - R Maxwell Collignon
- Department of Entomology, Entomology Building, University of California, Riverside, CA, 92521, United States of America
| | - Jennifer G Klutsch
- Department of Renewable Resources, 4-42 Earth Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
| | - Sanat S Kanekar
- Department of Renewable Resources, 4-42 Earth Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
| | - Altaf Hussain
- Department of Renewable Resources, 4-42 Earth Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
| | - Nadir Erbilgin
- Department of Renewable Resources, 4-42 Earth Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
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61
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Kandasamy D, Gershenzon J, Hammerbacher A. Volatile Organic Compounds Emitted by Fungal Associates of Conifer Bark Beetles and their Potential in Bark Beetle Control. J Chem Ecol 2016; 42:952-969. [PMID: 27687998 PMCID: PMC5101256 DOI: 10.1007/s10886-016-0768-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 08/14/2016] [Accepted: 09/07/2016] [Indexed: 11/06/2022]
Abstract
Conifer bark beetles attack and kill mature spruce and pine trees, especially during hot and dry conditions. These beetles are closely associated with ophiostomatoid fungi of the Ascomycetes, including the genera Ophiostoma, Grosmannia, and Endoconidiophora, which enhance beetle success by improving nutrition and modifying their substrate, but also have negative impacts on beetles by attracting predators and parasites. A survey of the literature and our own data revealed that ophiostomatoid fungi emit a variety of volatile organic compounds under laboratory conditions including fusel alcohols, terpenoids, aromatic compounds, and aliphatic alcohols. Many of these compounds already have been shown to elicit behavioral responses from bark beetles, functioning as attractants or repellents, often as synergists to compounds currently used in bark beetle control. Thus, these compounds could serve as valuable new agents for bark beetle management. However, bark beetle associations with fungi are very complex. Beetle behavior varies with the species of fungus, the stage of the beetle life cycle, the host tree quality, and probably with changes in the emission rate of fungal volatiles. Additional research on bark beetles and their symbiotic associates is necessary before the basic significance of ophiostomatoid fungal volatiles can be understood and their applied potential realized.
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Affiliation(s)
- Dineshkumar Kandasamy
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll Str. 8, 07745, Jena, Germany
| | - Jonathan Gershenzon
- Department of Biochemistry, Max Planck Institute for Chemical Ecology, Hans-Knöll Str. 8, 07745, Jena, Germany.
| | - Almuth Hammerbacher
- Department of Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Private Bag X20, Hatfield, Pretoria, 0028, South Africa
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62
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Briones-Roblero CI, Rodríguez-Díaz R, Santiago-Cruz JA, Zúñiga G, Rivera-Orduña FN. Degradation capacities of bacteria and yeasts isolated from the gut of Dendroctonus rhizophagus (Curculionidae: Scolytinae). Folia Microbiol (Praha) 2016; 62:1-9. [PMID: 27544667 DOI: 10.1007/s12223-016-0469-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 08/11/2016] [Indexed: 10/21/2022]
Abstract
Bark beetles (Curculionidae: Scolytinae) feed on the xylem and phloem of their host, which are composed of structural carbohydrates and organic compounds that are not easily degraded by the insects. Some of these compounds might be hydrolyzed by digestive enzymes produced by microbes present in the gut of these insects. In this study, we evaluated the enzymatic capacity of bacteria (Acinetobacter lwoffii, Arthrobacter sp., Pseudomonas putida, Pseudomonas azotoformans, and Rahnella sp.) and yeasts (Candida piceae, Candida oregonensis, Cyberlindnera americana, Zygoascus sp., and Rhodotorula mucilaginosa) isolated from the Dendroctonus rhizophagus gut to hydrolyze cellulose, xylan, pectin, starch, lipids, and esters. All isolates, with the exception of C. piceae, showed lipolytic activity. Furthermore, P. putida, P. azotoformans, C. americana, C. piceae, and R. mucilaginosa presented amylolytic activity. Esterase activity was shown by A. lwoffii, P. azotoformans, and Rahnella sp. Cellulolytic and xylanolytic activities were present only in Arthrobacter sp. and P. azotoformans. The pectinolytic activity was not recorded in any isolate. This is the first study to provide evidence on the capacity of microbes associated with the D. rhizophagus gut to hydrolyze specific substrates, which might cover part of the nutritional requirements for the development, fitness, and survival of these insects.
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Affiliation(s)
- Carlos I Briones-Roblero
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Variación Biológica y Evolución, Prol. Carpio Esq. Plan de Ayala s/n, Casco de Santo Tomás, C. P. 11340, México D. F, Mexico
| | - Roberto Rodríguez-Díaz
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Ecología Microbiana, Prol. Carpio Esq. Plan de Ayala s/n, Casco de Santo Tomás, C. P. 11340, México D. F, Mexico
| | - José A Santiago-Cruz
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Variación Biológica y Evolución, Prol. Carpio Esq. Plan de Ayala s/n, Casco de Santo Tomás, C. P. 11340, México D. F, Mexico
| | - Gerardo Zúñiga
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Variación Biológica y Evolución, Prol. Carpio Esq. Plan de Ayala s/n, Casco de Santo Tomás, C. P. 11340, México D. F, Mexico
| | - Flor N Rivera-Orduña
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Ecología Microbiana, Prol. Carpio Esq. Plan de Ayala s/n, Casco de Santo Tomás, C. P. 11340, México D. F, Mexico.
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63
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Dohet L, Grégoire JC, Berasategui A, Kaltenpoth M, Biedermann PHW. Bacterial and fungal symbionts of parasiticDendroctonusbark beetles. FEMS Microbiol Ecol 2016; 92:fiw129. [DOI: 10.1093/femsec/fiw129] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/06/2016] [Indexed: 11/14/2022] Open
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64
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Cytochrome P450 complement (CYPome) of Candida oregonensis, a gut-associated yeast of bark beetle, Dendroctonus rhizophagus. Fungal Biol 2016; 120:1077-89. [PMID: 27567714 DOI: 10.1016/j.funbio.2016.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 06/01/2016] [Accepted: 06/08/2016] [Indexed: 01/20/2023]
Abstract
Bark beetles (Curculionidae: Scolytinae) and associated microorganisms must overcome a complex tree's defence system, which includes toxic monoterpenes, to successfully complete their life cycle. A number of studies have suggested these microorganisms could have ecological roles related with the nutrition, detoxification, and semiochemical production. In particular, in filamentous fungi symbionts, cytochrome P450 (CYP) have been involved with terpenoid detoxification and biotransformation processes. Candida oregonensis has been isolated from the gut, ovaries, and frass of different bark beetle species, and it is a dominant species in the Dendroctonus rhizophagus gut. In this study, we identify, characterise, and infer the phylogenetic relationships of C. oregonensis CYP genes. The results indicate that the cytochrome P450 complement (CYPome) is composed of nine genes (CYP51F1, CYP61A1, CYP56D1, CYP52A59, CYP52A60, CYP52A61, CYP52A62, CYP5217A8, and CYP5217B1), which might participate in primary metabolic reactions such as sterol biosynthesis, biodegradation of xenobiotic, and resistance to environmental stress. The prediction of the cellular location suggests that these CYPs to be anchored to the plasma membrane, membranes of the endoplasmic reticulum, mitochondria, and peroxisomes. These findings lay the foundation for future studies about the functional role of P450s, not only for yeasts, but also for the insects with which they interact.
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Mason CJ, Hanshew AS, Raffa KF. Contributions by Host Trees and Insect Activity to Bacterial Communities in Dendroctonus valens (Coleoptera: Curculionidae) Galleries, and Their High Overlap With Other Microbial Assemblages of Bark Beetles. ENVIRONMENTAL ENTOMOLOGY 2016; 45:348-356. [PMID: 26721298 DOI: 10.1093/ee/nvv184] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/14/2015] [Indexed: 06/05/2023]
Abstract
Bark beetles are associated with a diversity of symbiotic microbiota that can mediate interactions with their host plants. Dendroctonus valens LeConte is a widely distributed bark beetle in North and Central America, and initiates solitary attacks on several species of Pinus in the Great Lakes region. In this study, we aimed to further characterize the bacterial community associated with D. valens feeding galleries using next-generation sequencing, and the possible contributions of both tree-resident and insect-associated bacteria to these consortia. We found that D. valens galleries harbor a diversity of microbial associates. Many of these associates were classified into a few taxonomic groups, of which Gammaproteobacteria were the most abundant class. Of the Gammaproteobacteria detected, many formed clades with 16S-rRNA sequences of bacteria previously associated with D. valens Many of the bacteria sequences detected in the galleries were similar to bacteria that function in detoxification, kairomone metabolism, and nitrogen fixation and cycling. The abundance of bacteria in galleries were 7× and 44× higher than in the surrounding uninfested tissues, and that were not attacked by D. valens, respectively. This suggests that the bacteria present in beetle galleries are largely introduced by D. valens and proliferate in this environment.
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Affiliation(s)
- Charles J Mason
- Department of Entomology, 345 Russell Labs 1630 Linden Dr., University of Wisconsin-Madison, Madison, WI 53706 (; ), Current Address: Department of Entomology, 501 Agricultural Sciences and Industries Building, The Pennsylvania State University, University Park, PA 16802,
| | - Alissa S Hanshew
- Department of Surgery, 1111 Highland Ave., University of Wisconsin-Madison, Madison, WI 53705 , and Current Address: Environmental Health and Safety, 6 Eisenhower Parking Deck, The Pennsylvania State University, University Park, PA 16802
| | - Kenneth F Raffa
- Department of Entomology, 345 Russell Labs 1630 Linden Dr., University of Wisconsin-Madison, Madison, WI 53706 (; )
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66
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Miller KE, Hopkins K, Inward DJG, Vogler AP. Metabarcoding of fungal communities associated with bark beetles. Ecol Evol 2016; 6:1590-600. [PMID: 26904186 PMCID: PMC4752364 DOI: 10.1002/ece3.1925] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 12/10/2015] [Indexed: 12/22/2022] Open
Abstract
Many species of fungi are closely allied with bark beetles, including many tree pathogens, but their species richness and patterns of distribution remain largely unknown. We established a protocol for metabarcoding of fungal communities directly from total genomic DNA extracted from individual beetles, showing that the ITS3/4 primer pair selectively amplifies the fungal ITS. Using three specimens of bark beetle from different species, we assess the fungal diversity associated with these specimens and the repeatability of these estimates in PCRs conducted with different primer tags. The combined replicates produced 727 fungal Operational Taxonomic Units (OTUs) for the specimen of Hylastes ater, 435 OTUs for Tomicus piniperda, and 294 OTUs for Trypodendron lineatum, while individual PCR reactions produced on average only 229, 54, and 31 OTUs for the three specimens, respectively. Yet, communities from PCR replicates were very similar in pairwise comparisons, in particular when considering species abundance, but differed greatly among the three beetle specimens. Different primer tags or the inclusion of amplicons in separate libraries did not impact the species composition. The ITS2 sequences were identified with the Lowest Common Ancestor approach and correspond to diverse lineages of fungi, including Ophiostomaceae and Leotiomycetes widely found to be tree pathogens. We conclude that Illumina MiSeq metabarcoding reliably captures fungal diversity associated with bark beetles, although numerous PCR replicates are recommended for an exhaustive sample. Direct PCR from beetle DNA extractions provides a rapid method for future surveys of fungal species diversity and their associations with bark beetles and environmental variables.
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Affiliation(s)
- Kirsten E Miller
- Department of Life Sciences Natural History Museum Cromwell Road London SW7 5BD UK; Department of Life Sciences Imperial College London Silwood Park Campus Ascot SL5 7PY UK
| | - Kevin Hopkins
- Department of Life Sciences Natural History Museum Cromwell Road London SW7 5BD UK
| | - Daegan J G Inward
- Centre for Ecosystems, Society and Biosecurity Forest Research Alice Holt Lodge Farnham Surrey GU10 4LH UK
| | - Alfried P Vogler
- Department of Life Sciences Natural History Museum Cromwell Road London SW7 5BD UK; Department of Life Sciences Imperial College London Silwood Park Campus Ascot SL5 7PY UK
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67
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Durand AA, Bergeron A, Constant P, Buffet JP, Déziel E, Guertin C. Surveying the endomicrobiome and ectomicrobiome of bark beetles: The case of Dendroctonus simplex. Sci Rep 2015; 5:17190. [PMID: 26608752 PMCID: PMC4660424 DOI: 10.1038/srep17190] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 10/26/2015] [Indexed: 11/13/2022] Open
Abstract
Many bark beetles belonging to the Dendroctonus genus carry bacterial and
fungal microbiota, forming a symbiotic complex that helps the insect to colonize the
subcortical environment of the host tree. However, the biodiversity of those
bacteria at the surface of the cuticle or inside the body parts of bark beetles is
not well established. The aim of this study was to characterize the bacterial
microbiome associated with the eastern larch beetle, Dendroctonus simplex,
using bacterial 16S rRNA gene pyrosequencing. The ecto- and endomicrobiome and the
subcortical galleries were investigated. Several bacterial genera were identified,
among which Pseudomonas, Serratia and Yersinia are associated with the
surface of the beetle cuticle, and genera belonging to Enterobacteriaceae and
Gammaproteobacteria with the interior of the insect body. The index of dissimilarity
indicates that the bacterial microbiome associated with each environment constitutes
exclusive groups. These results suggest the presence of distinct bacterial
microbiota on the surface of the cuticle and the interior of D. simplex body.
Additionally, the bacterial diversity identified in the galleries is substantially
different from the ectomicrobiome, which could indicate a selection by the insect.
This study reports for the first time the identification of the eastern larch beetle
microbiome.
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Affiliation(s)
| | | | | | | | - Eric Déziel
- INRS-Institut Armand-Frappier, Laval, QC, H7V1B7, Canada
| | - Claude Guertin
- INRS-Institut Armand-Frappier, Laval, QC, H7V1B7, Canada
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68
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Xu L, Lou Q, Cheng C, Lu M, Sun J. Gut-Associated Bacteria of Dendroctonus valens and their Involvement in Verbenone Production. MICROBIAL ECOLOGY 2015; 70:1012-23. [PMID: 25985770 DOI: 10.1007/s00248-015-0625-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 05/04/2015] [Indexed: 05/28/2023]
Abstract
Bark beetles are the most important mortality agent in coniferous forests, and pheromones play important roles in their management. Dendroctonus valens LeConte was introduced from North America to China and has killed millions of healthy pines there. Trapping with semiochemicals and pheromones was deployed in D. valens management in the last decade, but little is known about the ability of gut bacteria to produce the pheromone. In this study, we analyzed the volatiles in D. valens guts and frass after antibiotic treatment versus control. Then, we isolated and identified the bacteria in D. valens guts and frass, examined verbenone (a multifunctional pheromone of D. valens) production by 16 gut bacterial isolates from the precursor cis-verbenol at three concentrations, and further compared the cytotoxicities between the cis-verbenol and verbenone to the bacterial isolates. cis-Verbenol was not detected in the frass in the control group, but it was in the antibiotic treatment. The amount of verbenone was significantly suppressed in D. valens guts after antibiotic treatment versus control. Thirteen out of 16 gut bacterial isolates were capable of cis-verbenol to verbenone conversion, and cis-verbenol had stronger cytotoxicities than verbenone to all tested gut bacterial isolates. The bacterial species capable of verbenone production largely exists in D. valens guts and frass, suggesting that gut-associated bacteria may help the bark beetle produce the pheromone verbenone in guts and frass. The bacteria may benefit from the conversion due to the reduced cytotoxicity from the precursor to the beetle pheromone.
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Affiliation(s)
- Letian Xu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, 100101, Beijing, China
- University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Qiaozhe Lou
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, 100101, Beijing, China
- Technical Center, Hebei Entry-Exit Inspection and Quarantine Bureau, 050051, Shijiazhuang, China
| | - Chihang Cheng
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, 100101, Beijing, China
| | - Min Lu
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, 100101, Beijing, China.
| | - Jianghua Sun
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 1 Beichen West Road, Chaoyang District, 100101, Beijing, China.
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69
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Anderegg WRL, Hicke JA, Fisher RA, Allen CD, Aukema J, Bentz B, Hood S, Lichstein JW, Macalady AK, McDowell N, Pan Y, Raffa K, Sala A, Shaw JD, Stephenson NL, Tague C, Zeppel M. Tree mortality from drought, insects, and their interactions in a changing climate. THE NEW PHYTOLOGIST 2015; 208:674-83. [PMID: 26058406 DOI: 10.1111/nph.13477] [Citation(s) in RCA: 264] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 04/23/2015] [Indexed: 05/20/2023]
Abstract
Climate change is expected to drive increased tree mortality through drought, heat stress, and insect attacks, with manifold impacts on forest ecosystems. Yet, climate-induced tree mortality and biotic disturbance agents are largely absent from process-based ecosystem models. Using data sets from the western USA and associated studies, we present a framework for determining the relative contribution of drought stress, insect attack, and their interactions, which is critical for modeling mortality in future climates. We outline a simple approach that identifies the mechanisms associated with two guilds of insects - bark beetles and defoliators - which are responsible for substantial tree mortality. We then discuss cross-biome patterns of insect-driven tree mortality and draw upon available evidence contrasting the prevalence of insect outbreaks in temperate and tropical regions. We conclude with an overview of tools and promising avenues to address major challenges. Ultimately, a multitrophic approach that captures tree physiology, insect populations, and tree-insect interactions will better inform projections of forest ecosystem responses to climate change.
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Affiliation(s)
- William R L Anderegg
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, 08540, USA
| | - Jeffrey A Hicke
- Department of Geography, University of Idaho, Moscow, ID, 83844, USA
| | - Rosie A Fisher
- National Center for Atmospheric Research, Boulder, CO, 80305, USA
| | - Craig D Allen
- US Geological Survey, Fort Collins Science Center, Jemez Mountains Field Station, Los Alamos, NM, 87544, USA
| | - Juliann Aukema
- National Center for Ecological Analysis and Synthesis, Santa Barbara, CA, 93117, USA
| | - Barbara Bentz
- USDA Forest Service, Rocky Mountain Research Station, Logan, UT, 84321, USA
| | - Sharon Hood
- Division of Biological Sciences, The University of Montana, Missoula, MT, 59812, USA
| | - Jeremy W Lichstein
- Department of Biology, University of Florida, Gainesville, FL, 32611, USA
| | - Alison K Macalady
- School of Geography and Development, University of Arizona, Tucson, AZ, 85712, USA
| | - Nate McDowell
- Earth and Environmental Sciences Division, Los Alamos National Lab, Los Alamos, NM, 87545, USA
| | - Yude Pan
- Northern Research Station, US Forest Service, Newtown Square, PA, 19073, USA
| | - Kenneth Raffa
- Department of Entomology, University of Wisconsin, Madison, WI, 53706, USA
| | - Anna Sala
- Division of Biological Sciences, The University of Montana, Missoula, MT, 59812, USA
| | - John D Shaw
- Rocky Mountain Research Station, US Forest Service, Ogden, UT, 84401, USA
| | - Nathan L Stephenson
- US Geological Survey, Western Ecological Research Center, 47050 Generals Highway No. 4, Three Rivers, CA, 93271, USA
| | - Christina Tague
- Bren School of Environmental Science and Management, University of California - Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Melanie Zeppel
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
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70
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Davis TS. The ecology of yeasts in the bark beetle holobiont: a century of research revisited. MICROBIAL ECOLOGY 2015; 69:723-32. [PMID: 25117532 DOI: 10.1007/s00248-014-0479-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 08/04/2014] [Indexed: 05/14/2023]
Abstract
Yeasts are extremely common associates of scolytine bark beetles, yet the basic ecology of yeasts in the bark beetle holobiont remains poorly understood. Yeasts are present in all beetle life stages and consistently isolated from adult, larval, and pupal integuments and mycangial structures, but yeasts are also found in oviposition galleries, pupal chambers, larval and adult digestive tracts, as well as phloem and xylem tissues. Yeasts in the Saccharomycetaceae family are the most prevalent associates, and most individual beetles are associated with only one or several yeast species. Kuraishia capsulata and Ogataea pini are the most commonly encountered yeast species in surveys of Dendroctonus and Ips beetles; most beetles that have been surveyed are vectors for one or both yeasts. Yeasts have significant but often overlooked functional roles in bark beetle ecology. Infochemicals resulting from volatile production by yeast have wide-ranging bioactivity for arthropods: Yeast emissions attract beetles at low concentrations but repel beetles at high concentrations, and yeast emissions can also serve as cues to predators and parasites of bark beetles. In some cases, yeasts can modify tree chemistry over time or metabolize toxic terpenoids, though potential consequences for beetle performance or the growth of nutritional fungi remain to be demonstrated. Also, the presence of yeast species can restrict or promote the establishment and growth of filamentous fungi, including mutualists, entomopathogens, and opportunistic saprophytes. The role of yeasts as nutritional symbionts has received mixed support, though a nutritional hypothesis has not been extensively tested. Continued research on the functional ecology of bark beetle-yeast associations is needed to better understand the emergent properties of these complex symbiont assemblages.
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Affiliation(s)
- Thomas Seth Davis
- Department of Plant, Soil, and Entomological Sciences, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83843-2339, USA,
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71
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Rugman-Jones PF, Seybold SJ, Graves AD, Stouthamer R. Phylogeography of the walnut twig beetle, Pityophthorus juglandis, the vector of thousand cankers disease in North American walnut trees. PLoS One 2015; 10:e0118264. [PMID: 25695760 PMCID: PMC4335055 DOI: 10.1371/journal.pone.0118264] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 01/07/2015] [Indexed: 11/18/2022] Open
Abstract
Thousand cankers disease (TCD) of walnut trees (Juglans spp.) results from aggressive feeding in the phloem by the walnut twig beetle (WTB), Pityophthorus juglandis, accompanied by inoculation of its galleries with a pathogenic fungus, Geosmithia morbida. In 1960, WTB was only known from four U.S. counties (in Arizona, California, and New Mexico), but the species has now (2014) invaded over 115 counties, representing much of the western USA, and at least six states in the eastern USA. The eastern expansion places TCD in direct proximity to highly valuable (> $500 billion) native timber stands of eastern black walnut, Juglans nigra. Using mitochondrial DNA sequences, from nearly 1100 individuals, we examined variation among 77 samples of WTB populations across its extended range in the USA, revealing high levels of polymorphism and evidence of two divergent lineages. The highest level of genetic diversity for the different lineages was found in the neighboring Madrean Sky Island and Western New Mexico regions, respectively. Despite their proximity, there was little evidence of mixing between these regions, with only a single migrant detected among 179 beetles tested. Indeed, geographic overlap of the two lineages was only common in parts of Colorado and Utah. Just two haplotypes, from the same lineage, predominated over the vast majority of the recently expanded range. Tests for Wolbachia proved negative suggesting it plays no role in "driving" the spread of particular haplotypes, or in maintaining deep levels of intraspecific divergence in WTB. Genotyping of ribosomal RNA corroborated the mitochondrial lineages, but also revealed evidence of hybridization between them. Hybridization was particularly prevalent in the sympatric areas, also apparent in all invaded areas, but absent from the most haplotype-rich area of each mitochondrial lineage. Hypotheses about the specific status of WTB, its recent expansion, and potential evolutionary origins of TCD are discussed.
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Affiliation(s)
- Paul F. Rugman-Jones
- Department of Entomology, University of California Riverside, Riverside, California, United States of America
| | - Steven J. Seybold
- United States Department of Agriculture Forest Service, Pacific Southwest Research Station, Chemical Ecology of Forest Insects, Davis, California, United States of America
| | - Andrew D. Graves
- United States Department of Agriculture Forest Service, Forest Health Protection, 333 Broadway Blvd. SE, Albuquerque, New Mexico, United States of America
| | - Richard Stouthamer
- Department of Entomology, University of California Riverside, Riverside, California, United States of America
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Hu X, Li M, Chen H. Community structure of gut fungi during different developmental stages of the Chinese white pine beetle (Dendroctonus armandi). Sci Rep 2015; 5:8411. [PMID: 25672215 PMCID: PMC4325321 DOI: 10.1038/srep08411] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 01/19/2015] [Indexed: 01/05/2023] Open
Abstract
The Chinese white pine beetle is arguably the most destructive forest insect in the Qinling Mountains in Northern China. Little is known about the structure of the fungal communities associated with Dendroctonus armandi, even though this wood-boring insect plays important roles in ecosystem and biological invasion processes that result in huge economic losses in pine forests. The aim of this study was to investigate the fungal community structure present in the galleries and guts of D. armandi at different developmental stages using PCR-denaturing gradient gel electrophoresis (DGGE). Analysis of PCR-amplified 18S rRNA gene fragments of fungi from the guts of D. armandi revealed fungal communities of low complexity that differed according to the developmental stage. Yeast of the genus Candida and the filamentous fungi Ophiostoma predominated in D. armandi and its galleries. In particular, Candida accounted for 56% of the fungal community in the pupal stage. Characterizing the evolution and content of the intestinal microbial community structure in D. armandi may facilitate the development of new pest control strategies.
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Affiliation(s)
- Xia Hu
- College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Ming Li
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Hui Chen
- College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China
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74
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Terpenes tell different tales at different scales: glimpses into the Chemical Ecology of conifer - bark beetle - microbial interactions. J Chem Ecol 2013; 40:1-20. [PMID: 24337719 DOI: 10.1007/s10886-013-0368-y] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 11/09/2013] [Accepted: 11/21/2013] [Indexed: 12/18/2022]
Abstract
Chemical signaling mediates nearly all aspects of species interactions. Our knowledge of these signals has progressed dramatically, and now includes good characterizations of the bioactivities, modes of action, biosynthesis, and genetic programming of numerous compounds affecting a wide range of species. A major challenge now is to integrate this information so as to better understand actual selective pressures under natural conditions, make meaningful predictions about how organisms and ecosystems will respond to a changing environment, and provide useful guidance to managers who must contend with difficult trade-offs among competing socioeconomic values. One approach is to place stronger emphasis on cross-scale interactions, an understanding of which can help us better connect pattern with process, and improve our ability to make mechanistically grounded predictions over large areas and time frames. The opportunity to achieve such progress has been heightened by the rapid development of new scientific and technological tools. There are significant difficulties, however: Attempts to extend arrays of lower-scale processes into higher scale functioning can generate overly diffuse patterns. Conversely, attempts to infer process from pattern can miss critically important lower-scale drivers in systems where their biological and statistical significance is negated after critical thresholds are breached. Chemical signaling in bark beetle - conifer interactions has been explored for several decades, including by the two pioneers after whom this award is named. The strong knowledge base developed by many researchers, the importance of bark beetles in ecosystem functioning, and the socioeconomic challenges they pose, establish these insects as an ideal model for studying chemical signaling within a cross-scale context. This report describes our recent work at three levels of scale: interactions of bacteria with host plant compounds and symbiotic fungi (tree level, biochemical time), relationships among inducible and constitutive defenses, population dynamics, and plastic host-selection behavior (stand level, ecological time), and climate-driven range expansion of a native eruptive species into semi-naïve and potentially naïve habitats (geographical level, evolutionary time). I approach this problem by focusing primarily on one chemical group, terpenes, by emphasizing the curvilinear and threshold-structured basis of most underlying relationships, and by focusing on the system's feedback structure, which can either buffer or amplify relationships across scales.
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