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Šigutová H, Pyszko P, Šigut M, Czajová K, Kostovčík M, Kolařík M, Hařovská D, Drozd P. Concentration-dependent effect of plant secondary metabolites on bacterial and fungal microbiomes in caterpillar guts. Microbiol Spectr 2024; 12:e0299423. [PMID: 37991377 PMCID: PMC10783044 DOI: 10.1128/spectrum.02994-23] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 10/16/2023] [Indexed: 11/23/2023] Open
Abstract
IMPORTANCE The caterpillar gut is an excellent model system for studying host-microbiome interactions, as it represents an extreme environment for microbial life that usually has low diversity and considerable variability in community composition. Our study design combines feeding caterpillars on a natural and artificial diet with controlled levels of plant secondary metabolites and uses metabarcoding and quantitative PCR to simultaneously profile bacterial and fungal assemblages, which has never been performed. Moreover, we focus on multiple caterpillar species and consider diet breadth. Contrary to many previous studies, our study suggested the functional importance of certain microbial taxa, especially bacteria, and confirmed the previously proposed lower importance of fungi for caterpillar holobiont. Our study revealed the lack of differences between monophagous and polyphagous species in the responses of microbial assemblages to plant secondary metabolites, suggesting the limited role of the microbiome in the plasticity of the herbivore diet.
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Affiliation(s)
- Hana Šigutová
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czechia
- Department of Zoology, Faculty of Science, Palacký University, Olomouc, Czechia
| | - Petr Pyszko
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czechia
| | - Martin Šigut
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czechia
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Kateřina Czajová
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czechia
| | - Martin Kostovčík
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Miroslav Kolařík
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Denisa Hařovská
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czechia
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Pavel Drozd
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czechia
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Avila-Arias H, Turco RF, Scharf ME, Groves RL, Richmond DS. Larvae of an invasive scarab increase greenhouse gas emissions from soils and recruit gut mycobiota involved in C and N transformations. Front Microbiol 2023; 14:1102523. [PMID: 37025631 PMCID: PMC10072269 DOI: 10.3389/fmicb.2023.1102523] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 03/01/2023] [Indexed: 04/08/2023] Open
Abstract
Background Soil-derived prokaryotic gut communities of the Japanese beetle Popillia japonica Newman (JB) larval gut include heterotrophic, ammonia-oxidizing, and methanogenic microbes potentially capable of promoting greenhouse gas (GHG) emissions. However, no research has directly explored GHG emissions or the eukaryotic microbiota associated with the larval gut of this invasive species. In particular, fungi are frequently associated with the insect gut where they produce digestive enzymes and aid in nutrient acquisition. Using a series of laboratory and field experiments, this study aimed to (1) assess the impact of JB larvae on soil GHG emissions; (2) characterize gut mycobiota associated with these larvae; and (3) examine how soil biological and physicochemical characteristics influence variation in both GHG emissions and the composition of larval gut mycobiota. Methods Manipulative laboratory experiments consisted of microcosms containing increasing densities of JB larvae alone or in clean (uninfested) soil. Field experiments included 10 locations across Indiana and Wisconsin where gas samples from soils, as well as JB and their associated soil were collected to analyze soil GHG emissions, and mycobiota (ITS survey), respectively. Results In laboratory trials, emission rates of CO2, CH4, and N2O from infested soil were ≥ 6.3× higher per larva than emissions from JB larvae alone whereas CO2 emission rates from soils previously infested by JB larvae were 1.3× higher than emissions from JB larvae alone. In the field, JB larval density was a significant predictor of CO2 emissions from infested soils, and both CO2 and CH4 emissions were higher in previously infested soils. We found that geographic location had the greatest influence on variation in larval gut mycobiota, although the effects of compartment (i.e., soil, midgut and hindgut) were also significant. There was substantial overlap in the composition and prevalence of the core fungal mycobiota across compartments with prominent fungal taxa being associated with cellulose degradation and prokaryotic methane production/consumption. Soil physicochemical characteristics such as organic matter, cation exchange capacity, sand, and water holding capacity, were also correlated with both soil GHG emission, and fungal a-diversity within the JB larval gut. Conclusions: Results indicate JB larvae promote GHG emissions from the soil directly through metabolic activities, and indirectly by creating soil conditions that favor GHG-associated microbial activity. Fungal communities associated with the JB larval gut are primarily influenced by adaptation to local soils, with many prominent members of that consortium potentially contributing to C and N transformations capable of influencing GHG emissions from infested soil.
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Affiliation(s)
- Helena Avila-Arias
- Department of Entomology, Purdue University, West Lafayette, IN, United States
- *Correspondence: Helena Avila-Arias,
| | - Ronald F. Turco
- Department of Agronomy, Purdue University, West Lafayette, IN, United States
| | - Michael E. Scharf
- Entomology and Nematology Department, University of Florida, Gainesville, FL, United States
| | - Russell L. Groves
- Department of Entomology, University of Wisconsin-Madison, Madison, WI, United States
| | - Douglas S. Richmond
- Department of Entomology, Purdue University, West Lafayette, IN, United States
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Avila-Arias H, Scharf ME, Turco RF, Richmond DS. Soil Environments Influence Gut Prokaryotic Communities in the Larvae of the Invasive Japanese Beetle Popillia japonica Newman. Front Microbiol 2022; 13:854513. [PMID: 35572692 PMCID: PMC9094118 DOI: 10.3389/fmicb.2022.854513] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
Invasive scarab beetles, like the Japanese beetle Popillia japonica Newman (JB), spend most of their lives as larvae feeding in the soil matrix. Despite the potential importance of the larval gut microbial community in driving the behavior, physiology, and nutritional ecology of this invasive insect, the role of soil biological and physicochemical characteristics in shaping this community are relatively unknown. Our objectives were to (1) characterize the degree to which larval gut microbial communities are environmentally acquired, (2) examine the combined effects of the gut region (i.e., midgut, hindgut) and local soil environments on gut microbial communities, and (3) search for soil physicochemical correlates that could be useful in future studies aimed at characterizing gut microbial community variation in soil-dwelling scarabs. Gut communities from neonates that were never in contact with the soil were different from gut communities of third instar larvae collected from the field, with neonate gut communities being significantly less rich and diverse. The influence of compartment (soil, midgut, or hindgut) on prokaryotic α- and β-diversity varied with location, suggesting that JB larval gut communities are at least partially shaped by the local environment even though the influence of compartment was more pronounced. Midgut microbiota contained transient communities that varied with the surrounding soil environment whereas hindgut microbiota was more conserved. Prokaryotic communities in the hindgut clustered separately from those of soil and midgut, which displayed greater interspersion in ordination space. Soil cation exchange capacity, organic matter, water holding capacity, and texture were moderately correlated (≥29%) with gut prokaryotic microbial composition, especially within the midgut. Findings suggest that microbial communities associated with the JB gut are partially a function of adaptation to local soil environments. However, conditions within each gut compartment appear to shape those communities in transit through the alimentary canal.
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Affiliation(s)
- Helena Avila-Arias
- Soil Insect Ecology Laboratory, Department of Entomology, Purdue University, West Lafayette, IN, United States
| | - Michael E Scharf
- Entomology and Nematology Department, University of Florida, Gainesville, FL, United States
| | - Ronald F Turco
- Department of Agronomy, Purdue University, West Lafayette, IN, United States
| | - Douglas S Richmond
- Soil Insect Ecology Laboratory, Department of Entomology, Purdue University, West Lafayette, IN, United States
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4
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Liu Z, Sun J, Kong D, Wang Y, Tong X, Cao Y, Bi X, Meng F. Insights into gut microbiota communities of Poecilobdella manillensis, a prevalent Asian medicinal leech. J Appl Microbiol 2022; 133:1402-1413. [PMID: 35262268 DOI: 10.1111/jam.15514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/12/2022] [Accepted: 03/02/2022] [Indexed: 11/29/2022]
Abstract
AIMS Medicinal leeches (Annelida: Hirudinea) are fresh water ectoparasitic species which have been applied as traditional therapy. However, gut microbiota could bring high risks of opportunistic infections after leeching, and arouses great interests. Here gut bacterial and fungal communities of an Asian prevalent leech Poecilobdella manillensis, were characterized and analyzed through culture-independent sequencing. METHODS AND RESULTS With high coverage in 18 samples (>0.999), a more complicated community was apparent after comparing with previous leech studies. A total of 779/939 OTUs of bacteria and fungi were detected from leech guts. The bacterial community was dominated by phylum Bacteroidetes and Synergistetes. Genera Mucinivorans and Fretibacterium accounted mostly at the genus level. And genus Aeromonas showed an extremely low abundance (2.02%) on average. The fungal community was dominated by phylum Ascomycota and Basidiomycota. At the genus level, the dominant OTUs included Mortierella, Geminibasidium and Fusarium. The analysis of core taxa included those above dominant genera and some low-abundance genera (>1%). The functional annotation of bacterial community showed a close correlation with metabolism (34.8 ± 0.6%). Some fungal species were predicted as opportunistic human pathogens including Fusarium and Chaetomiaceae. CONCLUSIONS The present study provides fundamental rationales for further studies of such issues as bacteria-fungi-host interactions, host fitness, potential pathogens and infecting risks after leeching. It shall facilitate in-depth explorations on a safe utilization of leech therapy. SIGNIFICANCE AND IMPACT OF STUDY Present paper is the first-ever exploration on microbiota of a prevalent Asian medicinal leech based on culture-independent technical. And it is also the first report of gut fungi community of medicinal leech. The diversity and composition of bacteria in P. manillensis was far different from that of the European leech. The main components and core OTUs indicate a particular gut environment of medicinal leech. Unknown bacterial and fungal species were also recovered from leech gut.
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Affiliation(s)
- Zichao Liu
- Engineering Research Center for Exploitation & Utilization of Leech Resources in Universities of Yunnan Province, School of Agriculture & Life Sciences, Kunming University, Kunming, 650214, China
| | - Jianwei Sun
- Department of Medical Ultrasonography, Fifth Affiliated Hospital, Kunming Medical University, Gejiu, 661000, China
| | - Dejun Kong
- Engineering Research Center for Exploitation & Utilization of Leech Resources in Universities of Yunnan Province, School of Agriculture & Life Sciences, Kunming University, Kunming, 650214, China
| | - Yuxin Wang
- Xiangya School of Pharmaceutical Science, Central South University, Changsha, Hunan, China
| | - Xiangrong Tong
- Engineering Research Center for Exploitation & Utilization of Leech Resources in Universities of Yunnan Province, School of Agriculture & Life Sciences, Kunming University, Kunming, 650214, China
| | - Yanru Cao
- Engineering Research Center for Exploitation & Utilization of Leech Resources in Universities of Yunnan Province, School of Agriculture & Life Sciences, Kunming University, Kunming, 650214, China
| | - Xiaoxu Bi
- Engineering Research Center for Exploitation & Utilization of Leech Resources in Universities of Yunnan Province, School of Agriculture & Life Sciences, Kunming University, Kunming, 650214, China
| | - Fanming Meng
- Department of Medical Parasitology, School of Basic Medicine, Central South University, Changsha, Hunan, China
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Worming the Circular Economy for Biowaste and Plastics: Hermetia illucens, Tenebrio molitor, and Zophobas morio. SUSTAINABILITY 2022. [DOI: 10.3390/su14031594] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The negative impact of the modern-day lifestyle on the environment was aggravated during the COVID-19 pandemic through the increased use of single-use plastics from food take-aways to medical supplies. Similarly, the closure of food outlets and disrupted supply chains have also resulted in significant food wastage. As the pandemic rages on, the aggravation of increased waste becomes an increasingly urgent problem that threatens the biodiversity, ecosystems, and human health worldwide through pollution. While there are existing methods to deal with organic and plastic waste, many of the solutions cause additional problems. Increasingly proposed as a natural solution to man-made problems, there are insect solutions for dealing with the artificial and organic waste products and moving towards a circular economy, making the use of natural insect solutions commercially sustainable. This review discusses the findings on how some of these insects, particularly Hermetia illucens, Tenebrio molitor, and Zophobas morio, can play an increasingly important role in food and plastics, with a focus on the latter.
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Friman J, Karssemeijer PN, Haller J, de Kreek K, van Loon JJ, Dicke M. Shoot and root insect herbivory change the plant rhizosphere microbiome and affects cabbage-insect interactions through plant-soil feedback. THE NEW PHYTOLOGIST 2021; 232:2475-2490. [PMID: 34537968 PMCID: PMC9291931 DOI: 10.1111/nph.17746] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 09/09/2021] [Indexed: 05/06/2023]
Abstract
Plant-soil feedback (PSF) may influence plant-insect interactions. Although plant defense differs between shoot and root tissues, few studies have examined root-feeding insect herbivores in a PSF context. We examined here how plant growth and resistance against root-feeding Delia radicum larvae was influenced by PSF. We conditioned soil with cabbage plants that were infested with herbivores that affect D. radicum through plant-mediated effects: leaf-feeding Plutella xylostella caterpillars and Brevicoryne brassicae aphids, root-feeding D. radicum larvae, and/or added rhizobacterium Pseudomonas simiae WCS417r. We analyzed the rhizosphere microbial community, and in a second set of conspecific plants exposed to conditioned soil, we assessed growth, expression of defense-related genes, and D. radicum performance. The rhizosphere microbiome differed mainly between shoot and root herbivory treatments. Addition of Pseudomonas simiae did not influence rhizosphere microbiome composition. Plant shoot biomass, gene expression, and plant resistance against D. radicum larvae was affected by PSF in a treatment-specific manner. Soil conditioning overall reduced plant shoot biomass, Pseudomonas simiae-amended soil causing the largest growth reduction. In conclusion, shoot and root insect herbivores alter the rhizosphere microbiome differently, with consequences for growth and resistance of plants subsequently exposed to conditioned soil.
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Affiliation(s)
- Julia Friman
- Laboratory of EntomologyWageningen University and ResearchDroevendaalsesteeg 1Wageningen6708 PBthe Netherlands
| | - Peter N. Karssemeijer
- Laboratory of EntomologyWageningen University and ResearchDroevendaalsesteeg 1Wageningen6708 PBthe Netherlands
| | - Julian Haller
- Laboratory of EntomologyWageningen University and ResearchDroevendaalsesteeg 1Wageningen6708 PBthe Netherlands
| | - Kris de Kreek
- Laboratory of EntomologyWageningen University and ResearchDroevendaalsesteeg 1Wageningen6708 PBthe Netherlands
| | - Joop J.A. van Loon
- Laboratory of EntomologyWageningen University and ResearchDroevendaalsesteeg 1Wageningen6708 PBthe Netherlands
| | - Marcel Dicke
- Laboratory of EntomologyWageningen University and ResearchDroevendaalsesteeg 1Wageningen6708 PBthe Netherlands
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7
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Ge SX, Shi FM, Pei JH, Hou ZH, Zong SX, Ren LL. Gut Bacteria Associated With Monochamus saltuarius (Coleoptera: Cerambycidae) and Their Possible Roles in Host Plant Adaptations. Front Microbiol 2021; 12:687211. [PMID: 34234761 PMCID: PMC8256174 DOI: 10.3389/fmicb.2021.687211] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/31/2021] [Indexed: 12/02/2022] Open
Abstract
Monochamus saltuarius (Coleoptera: Cerambycidae) is an important native pest in the pine forests of northeast China and a dispersing vector of an invasive species Bursaphelenchus xylophilus. To investigate the bacterial gut diversity of M. saltuarius larvae in different host species, and infer the role of symbiotic bacteria in host adaptation, we used 16S rRNA gene Illumina sequencing and liquid chromatography-mass spectrometry metabolomics processing to obtain and compare the composition of the bacterial community and metabolites in the midguts of larvae feeding on three host tree species: Pinus koraiensis, Pinus sylvestris var. mongolica, and Pinus tabuliformis. Metabolomics in xylem samples from the three aforementioned hosts were also performed. Proteobacteria and Firmicutes were the predominant bacterial phyla in the larval gut. At the genus level, Klebsiella, unclassified_f__Enterobacteriaceae, Lactococcus, and Burkholderia–Caballeronia–Paraburkholderia were most dominant in P. koraiensis and P. sylvestris var. mongolica feeders, while Burkholderia–Caballeronia–Paraburkholderia, Dyella, Pseudoxanthomonas, and Mycobacterium were most dominant in P. tabuliformis feeders. Bacterial communities were similar in diversity in P. koraiensis and P. sylvestris var. mongolica feeders, while communities were highly diverse in P. tabuliformis feeders. Compared with the other two tree species, P. tabuliformis xylems had more diverse and abundant secondary metabolites, while larvae feeding on these trees had a stronger metabolic capacity for secondary metabolites than the other two host feeders. Correlation analysis of the association of microorganisms with metabolic features showed that dominant bacterial genera in P. tabuliformis feeders were more negatively correlated with plant secondary metabolites than those of other host tree feeders.
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Affiliation(s)
- Si-Xun Ge
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China
| | - Feng-Ming Shi
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China
| | - Jia-He Pei
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China
| | - Ze-Hai Hou
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China
| | - Shi-Xiang Zong
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China.,Sino-French Joint Laboratory for Invasive Forest Pests in Eurasia, French National Research Institute for Agriculture, Food and Environment (INRAE), Beijing Forestry University, Beijing, China
| | - Li-Li Ren
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China.,Sino-French Joint Laboratory for Invasive Forest Pests in Eurasia, French National Research Institute for Agriculture, Food and Environment (INRAE), Beijing Forestry University, Beijing, China
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8
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Paddock KJ, Pereira AE, Finke DL, Ericsson AC, Hibbard BE, Shelby KS. Host resistance to Bacillus thuringiensis is linked to altered bacterial community within a specialist insect herbivore. Mol Ecol 2021; 30:5438-5453. [PMID: 33683750 PMCID: PMC9290792 DOI: 10.1111/mec.15875] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 02/12/2021] [Accepted: 03/01/2021] [Indexed: 12/19/2022]
Abstract
Evolution of resistance to transgenic crops producing toxins from Bacillus thuringiensis (Bt) threatens the sustainability of the technology. Examination of resistance mechanisms has largely focused on characterization of mutations in proteins serving as Bt toxin binding sites. However, insect microbial communities have the potential to provide host resistance to pesticides in a myriad of ways. Previous findings suggest the killing mechanism of Bt relies on enteric bacteria becoming pathogenic in the disrupted gut environment of the insect following Bt intoxication. Thus, here we hypothesized that resistance to Bt would alter the microbiome composition of the insect. Previous studies have manipulated the microbiome of susceptible insects and monitored their response to Bt. In our study, we characterized the associated bacterial communities of Bt‐resistant and ‐susceptible western corn rootworms, a widespread pest of maize in the United States. We found resistant insects harbor a bacterial community that is less rich and distinct from susceptible insects. After feeding on Bt‐expressing maize, susceptible insects exhibited dysbiosis of the associated bacterial community, whereas the community within resistant insects remained relatively unchanged. These results suggest resistance to Bt produces alterations in the microbiome of the western corn rootworm that may contribute to resistance. We further demonstrated that by itself, feeding on Bt toxin‐expressing seedlings caused a shift in the microbiota. This work provides a broader picture of the effect stressors have on microbiome composition, and the potential heritable changes induced as a result of intense selection.
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Affiliation(s)
- Kyle J Paddock
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA
| | - Adriano E Pereira
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA
| | - Deborah L Finke
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA
| | - Aaron C Ericsson
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, USA
| | - Bruce E Hibbard
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA.,USDA-ARS, University of Missouri, Columbia, MO, USA
| | - Kent S Shelby
- Division of Plant Sciences, University of Missouri, Columbia, MO, USA.,USDA-ARS, Columbia, MO, USA
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Bažok R, Lemić D, Chiarini F, Furlan L. Western Corn Rootworm ( Diabrotica virgifera virgifera LeConte) in Europe: Current Status and Sustainable Pest Management. INSECTS 2021; 12:insects12030195. [PMID: 33668906 PMCID: PMC7996541 DOI: 10.3390/insects12030195] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 02/11/2021] [Accepted: 02/21/2021] [Indexed: 11/18/2022]
Abstract
Simple Summary Diabrotica virgifera virgifera, also known as western corn rootworm (WCR), is a maize-specific pest that has been a serious threat in Europe since the mid-1990s. Between 1995 and 2010, European countries were involved in international projects to plan pest control strategies. However, since 2011, collaborative efforts have declined and the overview of knowledge on WCR is in great need of updating. Therefore, a review of scientific papers published between 2008 and 2020, in addition to direct interviews with experts responsible for WCR management in several European countries, was conducted to (1) summarize the research conducted over the last 12 years and (2) describe the current WCR distribution and population in the EU, and the management strategies implemented. A considerable amount of new knowledge has been gained over the last 12 years, which has contributed to the development of pest management strategies applicable in EU agricultural systems. There is no EU country reporting economic damage on a large scale. In many countries, solutions based on crop rotation are regularly implemented, avoiding insecticide use. Therefore, WCR has not become as serious a pest as was expected when it was discovered in much of Europe. Abstract Western corn rootworm (WCR), or Diabrotica virgifera virgifera LeConte, became a very serious quarantine maize pest in Europe in the mid-1990s. Between 1995 and 2010, European countries were involved in international projects to share information and plan common research for integrated pest management (IPM) implementation. Since 2011, however, common efforts have declined, and an overview of WCR population spread, density, and research is in serious need of update. Therefore, we retained that it was necessary to (1) summarize the research activities carried out in the last 12 years in various countries and the research topics addressed, and analyze how these activities have contributed to IPM for WCR and (2) present the current distribution of WCR in the EU and analyze the current population levels in different European countries, focusing on different management strategies. A review of scientific papers published from 2008 to 2020, in addition to direct interviews with experts in charge of WCR management in a range of European countries, was conducted. Over the past 12 years, scientists in Europe have continued their research activities to investigate various aspects of WCR management by implementing several approaches to WCR control. A considerable amount of new knowledge has been produced, contributing to the development of pest management strategies applicable in EU farming systems. Among the 10 EU countries analyzed, there is no country reporting economic damage on a large scale. Thanks to intensive research leading to specific agricultural practices and the EU Common Agricultural Policy, there are crop-rotation-based solutions that can adequately control this pest avoiding insecticide use.
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Affiliation(s)
- Renata Bažok
- Department for Agricultural Zoology, Faculty of Agriculture, University of Zagreb, Svetosimunska 25, 10000 Zagreb, Croatia; (R.B.); (D.L.)
| | - Darija Lemić
- Department for Agricultural Zoology, Faculty of Agriculture, University of Zagreb, Svetosimunska 25, 10000 Zagreb, Croatia; (R.B.); (D.L.)
| | - Francesca Chiarini
- Veneto Agricoltura, Agricultural Research Department, 35020 Legnaro, PD, Italy;
| | - Lorenzo Furlan
- Veneto Agricoltura, Agricultural Research Department, 35020 Legnaro, PD, Italy;
- Correspondence: ; Tel.: +39-049-829-3879
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10
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Paddock KJ, Robert CAM, Erb M, Hibbard BE. Western Corn Rootworm, Plant and Microbe Interactions: A Review and Prospects for New Management Tools. INSECTS 2021; 12:171. [PMID: 33671118 PMCID: PMC7922318 DOI: 10.3390/insects12020171] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/11/2021] [Accepted: 02/13/2021] [Indexed: 12/12/2022]
Abstract
The western corn rootworm, Diabrotica virgifera virgifera LeConte, is resistant to four separate classes of traditional insecticides, all Bacillius thuringiensis (Bt) toxins currently registered for commercial use, crop rotation, innate plant resistance factors, and even double-stranded RNA (dsRNA) targeting essential genes via environmental RNA interference (RNAi), which has not been sold commercially to date. Clearly, additional tools are needed as management options. In this review, we discuss the state-of-the-art knowledge about biotic factors influencing herbivore success, including host location and recognition, plant defensive traits, plant-microbe interactions, and herbivore-pathogens/predator interactions. We then translate this knowledge into potential new management tools and improved biological control.
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Affiliation(s)
- Kyle J. Paddock
- Division of Plant Sciences, University of Missouri, Columbia, MO 65211, USA;
| | - Christelle A. M. Robert
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland; (C.A.M.R.); (M.E.)
- Oeschger Centre for Climate Change Research, University of Bern, 3013 Bern, Switzerland
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, 3013 Bern, Switzerland; (C.A.M.R.); (M.E.)
- Oeschger Centre for Climate Change Research, University of Bern, 3013 Bern, Switzerland
| | - Bruce E. Hibbard
- Plant Genetics Research Unit, United States Department of Agriculture, Agricultural Research Service, Columbia, MO 65211, USA
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11
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Mason CJ. Complex Relationships at the Intersection of Insect Gut Microbiomes and Plant Defenses. J Chem Ecol 2020; 46:793-807. [PMID: 32537721 DOI: 10.1007/s10886-020-01187-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/13/2020] [Accepted: 05/27/2020] [Indexed: 02/07/2023]
Abstract
Insect herbivores have ubiquitous associations with microorganisms that have major effects on how host insects may interact in their environment. Recently, increased attention has been given to how insect gut microbiomes mediate interactions with plants. In this paper, I discuss the ecology and physiology of gut bacteria associated with insect herbivores and how they may shape interactions between insects and their various host plants. I first establish how microbial associations vary between insects with different feeding styles, and how the insect host physiology and ecology can shape stable or transient relationships with gut bacteria. Then, I describe how these relationships factor in with plant nutrition and plant defenses. Within this framework, I suggest that many of the interactions between plants, insects, and the gut microbiome are context-dependent and shaped by the type of defense and the isolates present in the environment. Relationships between insects and plants are not pairwise, but instead highly multipartite, and the interweaving of complex microbial interactions is needed to fully explore the context-dependent aspects of the gut microbiome in many of these systems. I conclude the review by suggesting studies that would help reduce the unsureness of microbial interactions with less-defined herbivore systems and identify how each could provide a path to more robust roles and traits.
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Affiliation(s)
- Charles J Mason
- The Pennsylvania State University Department of Entomology, 501 ASI Building, University Park, PA, 16823, USA.
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12
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Ludwick DC, Ericsson AC, Meihls LN, Gregory MLJ, Finke DL, Coudron TA, Hibbard BE, Shelby KS. Survey of bacteria associated with western corn rootworm life stages reveals no difference between insects reared in different soils. Sci Rep 2019; 9:15332. [PMID: 31653954 PMCID: PMC6814711 DOI: 10.1038/s41598-019-51870-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 10/04/2019] [Indexed: 02/01/2023] Open
Abstract
Western corn rootworm (Diabrotica virgifera virgifera LeConte) is a serious pest of maize (Zea mays L.) in North America and parts of Europe. With most of its life cycle spent in the soil feeding on maize root tissues, this insect is likely to encounter and interact with a wide range of soil and rhizosphere microbes. Our knowledge of the role of microbes in pest management and plant health remains woefully incomplete, yet that knowledge could play an important role in effective pest management strategies. For this study, insects were reared on maize in soils from different locations. Insects from two different laboratory colonies (a diapausing and a non-diapausing colony) were sampled at each life stage to determine the possible core bacteriome. Additionally, soil was sampled at each life stage and resulting bacteria were identified to determine the possible contribution of soil to the rootworm bacteriome, if any. We analyzed the V4 hypervariable region of bacterial 16S rRNA genes with Illumina MiSeq to survey the different species of bacteria associated with the insects and the soils. The bacterial community associated with insects was significantly different from that in the soil. Some differences appear to exist between insects from non-diapausing and diapausing colonies while no significant differences in community composition existed between the insects reared on different soils. Despite differences in the bacteria present in immature stages and in male and female adults, there is a possible core bacteriome of approximately 16 operational taxonomic units (i.e., present across all life stages). This research may provide insights into Bt resistance development, improved nutrition in artificial rearing systems, and new management strategies.
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Affiliation(s)
| | - Aaron C Ericsson
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, 65201, USA
| | - Lisa N Meihls
- USDA-ARS, Donald Danforth Plant Science Center, St. Louis, MO, 63132, USA
| | | | - Deborah L Finke
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Thomas A Coudron
- USDA-ARS, 1503 S. Providence Rd., Columbia, MO, 65203, USA.,Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - Bruce E Hibbard
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA.,USDA-ARS, 205 Curtis Hall, University of Missouri, Columbia, MO, 65211, USA
| | - Kent S Shelby
- USDA-ARS, 1503 S. Providence Rd., Columbia, MO, 65203, USA. .,Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA.
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13
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Diouf M, Miambi E, Mora P, Frechault S, Robert A, Rouland-Lefèvre C, Hervé V. Variations in the relative abundance of Wolbachia in the gut of Nasutitermes arborum across life stages and castes. FEMS Microbiol Lett 2019; 365:4904115. [PMID: 29579215 DOI: 10.1093/femsle/fny046] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 02/22/2018] [Indexed: 12/19/2022] Open
Abstract
There are multiple forms of interactions between termites and bacteria. In addition to their gut microbiota, which has been intensively studied, termites host intracellular symbionts such as Wolbachia. These distinct symbioses have been so far approached independently and mostly in adult termites. We addressed the dynamics of Wolbachia and the microbiota of the eggs and gut for various life stages and castes of the wood-feeding termite, Nasutitermes arborum, using deep-sequencing of the 16S rRNA gene. Wolbachia was dominant in eggs as expected. Unexpectedly, it persisted in the gut of nearly all stages and castes, indicating a wide somatic distribution in termites. Wolbachia-related sequences clustered into few operational taxonomic units, but these were within the same genotype, acquired maternally. Wolbachia was largely dominant in DNA extracts from the guts of larvae and pre-soldiers (59.1%-99.1% of reads) where gut-resident lineages were less represented and less diverse. The reverse was true for the adult castes. This is the first study reporting the age-dependency of the relative abundance of Wolbachia in the termite gut and its negative correlation with the diversity of the microbiota. The possible mechanisms underlying this negative interaction are discussed.
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Affiliation(s)
- Michel Diouf
- Faculté des Sciences et Technologie, Université Paris Est Créteil, Département ECOEVO, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES, Paris). 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Edouard Miambi
- Faculté des Sciences et Technologie, Université Paris Est Créteil, Département ECOEVO, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES, Paris). 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Philippe Mora
- Faculté des Sciences et Technologie, Université Paris Est Créteil, Département ECOEVO, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES, Paris). 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Sophie Frechault
- Faculté des Sciences et Technologie, Université Paris Est Créteil, Département ECOEVO, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES, Paris). 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Alain Robert
- Département ECOEVO, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES, Paris). Centre IRD France Nord, 32 Avenue Henri Varagnat, 93143 Bondy, France
| | - Corinne Rouland-Lefèvre
- Département ECOEVO, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES, Paris). Centre IRD France Nord, 32 Avenue Henri Varagnat, 93143 Bondy, France
| | - Vincent Hervé
- Research Group Insect Gut Microbiology and Symbiosis, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse 10, 35043 Marburg, Germany
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Kim TK, Yong HI, Kim YB, Kim HW, Choi YS. Edible Insects as a Protein Source: A Review of Public Perception, Processing Technology, and Research Trends. Food Sci Anim Resour 2019; 39:521-540. [PMID: 31508584 PMCID: PMC6728817 DOI: 10.5851/kosfa.2019.e53] [Citation(s) in RCA: 141] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 07/08/2019] [Accepted: 07/10/2019] [Indexed: 12/29/2022] Open
Abstract
This review summarizes the current trends related to insect as food resources
among consumers, industry, and academia. In Western societies, edible insects
have a greater potential as animal feed than as human food because of cultural
biases associated with harmful insects, although the abundant characteristics of
edible insects should benefit human health. Nevertheless, many countries in
Asia, Oceania, Africa, and Latin America utilize insects as a major protein
source. Using insects can potentially solve problems related to the conventional
food-supply chain, including global water, land, and energy deficits. Academic,
industry, and government-led efforts have attempted to reduce negative
perceptions of insects through developing palatable processing methods, as well
as providing descriptions of health benefits and explaining the necessity of
reducing reliance on other food sources. Our overview reveals that entomophagy
is experiencing a steady increase worldwide, despite its unfamiliarity to the
consumers influenced by Western eating habits.
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Affiliation(s)
- Tae-Kyung Kim
- Research Group of Food Processing, Korea Food Research Institute, Wanju 55365, Korea
| | - Hae In Yong
- Research Group of Food Processing, Korea Food Research Institute, Wanju 55365, Korea
| | - Young-Boong Kim
- Research Group of Food Processing, Korea Food Research Institute, Wanju 55365, Korea
| | - Hyun-Wook Kim
- Department of Animal Science & Biotechnology, Gyeongnam National University of Science and Technology, Jinju 52725, Korea
| | - Yun-Sang Choi
- Research Group of Food Processing, Korea Food Research Institute, Wanju 55365, Korea
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15
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Do different livestock dwellings on single grassland share similar faecal microbial communities? Appl Microbiol Biotechnol 2019; 103:5023-5037. [PMID: 31055653 DOI: 10.1007/s00253-019-09849-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 03/25/2019] [Accepted: 04/11/2019] [Indexed: 12/27/2022]
Abstract
Huge numbers of microorganisms reside in livestock faeces and constitute one of the most complex microbial ecosystems. Here, faecal microbial communities of three typical livestock in Xilingol steppe grassland, i.e. sheep, cattle, and horse, were investigated by Illumina MiSeq sequencing and quantitative real-time polymerase chain reaction (qPCR). Firmicutes and Bacteroidetes comprised the majority of bacterial communities in three livestock faeces. Sordariomycetes, Leotiomycetes, and Dothideomycetes were dominant in fungal communities, as well as Methanobacteria and Methanomicrobia were dominant in archaeal communities in three livestock faeces. Similar fungal community dominated in these samples, with 95.51% of the sequences falling into the overlap of three livestock faeces. In contrast, bacterial communities were quite variable among three different livestock faeces, but a similar community was observed in sheep and cattle faeces. Nearly all the archaea were identified as methanogens, whilst the most diverse and abundant methanogens were detected in cattle faeces. Potential pathogens including Bacteroides spp., Desulfovibrio spp., and Fusarium spp. were also detected in livestock faeces. Overall, this study provides the first detailed microbial comparison of typical livestock faeces dwelling on single grassland, and may be help guide management strategies for livestock grazing and grassland restoration.
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Nguyen TTT, Park SW, Pangging M, Lee HB. Molecular and Morphological Confirmation of Three Undescribed Species of Mortierella from Korea. MYCOBIOLOGY 2019; 47:31-39. [PMID: 30988989 PMCID: PMC6450579 DOI: 10.1080/12298093.2018.1551854] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 11/03/2018] [Accepted: 11/05/2018] [Indexed: 05/20/2023]
Abstract
Three fungal isolates designated as CNUFC-YR329-1, CNUFC-PTS103-1, and CNUFC-PTS2-1 were discovered during a survey of fungal diversity of the order Mortierellales from freshwater and pine tree rhizosphere soil samples in Korea. The strains were analyzed morphologically and phylogenetically based on the internal transcribed spacer (ITS) and large subunit (LSU) of ribosomal DNA gene sequences. Based on their morphology and phylogeny, the three isolates were identified as Mortierella elongata, M. horticola, and M. humilis, respectively. To the best of our knowledge, M. elongata, M. horticola, and M. humilis, belonging to an undiscovered taxon, have not been previously described in Korea.
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Affiliation(s)
- Thuong T. T. Nguyen
- Division of Food Technology, Biotechnology and Agrochemistry, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, Korea
| | - Se Won Park
- Division of Food Technology, Biotechnology and Agrochemistry, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, Korea
| | - Monmi Pangging
- Division of Food Technology, Biotechnology and Agrochemistry, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, Korea
| | - Hyang Burm Lee
- Division of Food Technology, Biotechnology and Agrochemistry, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, Korea
- CONTACT Hyang Burm Lee
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17
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Mason CJ, Jones AG, Felton GW. Co-option of microbial associates by insects and their impact on plant-folivore interactions. PLANT, CELL & ENVIRONMENT 2019; 42:1078-1086. [PMID: 30151965 DOI: 10.1111/pce.13430] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 08/16/2018] [Accepted: 08/17/2018] [Indexed: 05/28/2023]
Abstract
Plants possess a suite of traits that make them challenging to consume by insect herbivores. Plant tissues are recalcitrant, have low levels of protein, and may be well defended by chemicals. Insects use diverse strategies for overcoming these barriers, including co-opting metabolic activities from microbial associates. In this review, we discuss the co-option of bacteria and fungi in the herbivore gut. We particularly focus upon chewing, folivorous insects (Coleoptera and Lepidoptera) and discuss the impacts of microbial co-option on herbivore performance and plant responses. We suggest that there are two components to microbial co-option: fixed and plastic relationships. Fixed relationships are involved in integral dietary functions and can be performed by microbial enzymes co-opted into the genome or by stably transferred associates. In contrast, the majority of gut symbionts appear to be looser and perform more facultative, context-dependent functions. This more plastic, variable co-option of bacteria likely produces a greater number of insect phenotypes, which interact differently with plant hosts. By altering plant detection of herbivory or mediating insect interactions with plant defensive compounds, microbes can effectively improve herbivore performance in real time within and between generations.
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Affiliation(s)
- Charles J Mason
- Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania
| | - Asher G Jones
- Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania
| | - Gary W Felton
- Department of Entomology, The Pennsylvania State University, University Park, Pennsylvania
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18
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Spiroplasma dominates the microbiome of khapra beetle: comparison with a congener, effects of life stage and temperature. Symbiosis 2018. [DOI: 10.1007/s13199-018-0560-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Schlüter O, Rumpold B, Holzhauser T, Roth A, Vogel RF, Quasigroch W, Vogel S, Heinz V, Jäger H, Bandick N, Kulling S, Knorr D, Steinberg P, Engel KH. Safety aspects of the production of foods and food ingredients from insects. Mol Nutr Food Res 2016; 61. [PMID: 27623740 DOI: 10.1002/mnfr.201600520] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 09/06/2016] [Accepted: 09/08/2016] [Indexed: 11/11/2022]
Abstract
At present, insects are rarely used by the European food industry, but they are a subject of growing interest as an alternative source of raw materials. The risks associated with the use of insects in the production of foods and food ingredients have not been sufficiently investigated. There is a lack of scientifically based knowledge of insect processing to ensure food safety, especially when these processes are carried out on an industrial scale. This review focuses on the safety aspects that need to be considered regarding the fractionation of insects for the production of foods and food ingredients.
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Affiliation(s)
- Oliver Schlüter
- Leibniz Institute for Agricultural Engineering Potsdam-Bornim, Potsdam, Germany
| | - Birgit Rumpold
- Leibniz Institute for Agricultural Engineering Potsdam-Bornim, Potsdam, Germany
| | | | - Angelika Roth
- Institute for Food Toxicology and Analytical Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Rudi F Vogel
- Chair of Technical Microbiology, Center of Life and Food Sciences Weihenstephan, Technical University of Munich, Freising-Weihenstephan, Germany
| | | | - Stephanie Vogel
- Institute for Food Toxicology and Analytical Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Volker Heinz
- German Institute of Food Technologies, Quakenbrück, Germany
| | - Henry Jäger
- Institute of Food Technology, University of Natural Resources and Life Sciences (BOKU) Vienna, Vienna, Austria
| | - Nils Bandick
- Unit Food Technologies, Supply Chains and Food Defense Department Biological Safety, Federal Institute for Risk Assessment, Berlin, Germany
| | - Sabine Kulling
- Department of Safety and Quality of Fruit and Vegetables, Federal Research Institute of Nutrition and Food, Max Rubner-Institut, Karlsruhe, Germany
| | - Dietrich Knorr
- Department of Food Biotechnology and Food Process Engineering, Technical University of Berlin, Berlin, Germany
| | - Pablo Steinberg
- Institute for Food Toxicology and Analytical Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Karl-Heinz Engel
- Chair of General Food Technology, Center of Life and Food Sciences Weihenstephan, Technical University of Munich, Freising-Weihenstephan, Germany
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20
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Hadapad AB, Prabhakar CS, Chandekar SC, Tripathi J, Hire RS. Diversity of bacterial communities in the midgut of Bactrocera cucurbitae (Diptera: Tephritidae) populations and their potential use as attractants. PEST MANAGEMENT SCIENCE 2016; 72:1222-1230. [PMID: 26299539 DOI: 10.1002/ps.4102] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 07/03/2015] [Accepted: 08/17/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND The microbiota plays an important role in insect development and fitness. Understanding the gut microbiota composition is essential for the development of pest management strategies. Midgut bacteria were isolated from nine wild B. cucurbitae populations collected from different agroecological zones of India. These isolates were further studied for attractant potential of fruit fly adults, and the chemical constituents in the supernatants of gut bacteria were analysed. RESULTS Twenty-six bacterial isolates belonging to the families Enterobacteriaceae, Bacillaceae, Micrococcaceae and Staphylococcaceae were isolated and identified on the basis of 16S rRNA gene sequence analysis. The dominant species in the midgut of melon fly were from the genera Enterobacter (34.6%), Klebsiella (19.2%), Citrobacter (7.7%), Bacillus (15.4%) and Providencia (7.7%), and 3.8% each of Micrococcus, Staphylococcus, Leclercia and Exiguobacterium. Bactrocera cucurbitae and B. dorsalis adults were significantly attracted to bacterial whole cell cultures and their supernatants in the fruit fly attraction bioassays. Bacillus cereus, Enterobacter, Klebsiella, Citrobacter and Providencia species attracted both male and females of Bactrocera species. The supernatants of Klebsiella, Citrobacter and Providencia species attracted a significantly greater number of females than males. The most abundant chemical constituents in supernatants of K. oxytoca and C. freundii were 3-methyl-1-butanol, 2-phenylethanol, butyl isocyanatoacetate, 2-methyl-1-propanol and 3-hydroxy-2-butanone, as identified by gas chromatography-mass spectrometry. CONCLUSIONS The bacterial endosymbionts associated with melon fly exhibited attractant potential which could facilitate eco-friendly insect control strategies. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Ashok B Hadapad
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - Chandra S Prabhakar
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
- Department of Entomology, Bihar Agricultural University, Sabour, Bhagalpur, Bihar, India
| | - Snehal C Chandekar
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - Jyoti Tripathi
- Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - Ramesh S Hire
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
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Acevedo FE, Rivera-Vega LJ, Chung SH, Ray S, Felton GW. Cues from chewing insects - the intersection of DAMPs, HAMPs, MAMPs and effectors. CURRENT OPINION IN PLANT BIOLOGY 2015; 26:80-6. [PMID: 26123394 DOI: 10.1016/j.pbi.2015.05.029] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 05/22/2015] [Accepted: 05/22/2015] [Indexed: 05/04/2023]
Abstract
Chewing herbivores cause massive damage when crushing plant tissues with their mandibles, thus releasing a vast array of cues that may be perceived by the plant to mobilize defenses. Besides releasing damage cues in wounded tissues, herbivores deposit abundant cues from their saliva, regurgitant and feces that trigger herbivore specific responses in plants. Herbivores can manipulate the perception mechanisms and defense signals to suppress plant defenses by secreting effectors and/or by exploiting their associated oral microbes. Recent studies indicate that both the composition of herbivore cues and the plant's ability to recognize them are highly dependent upon the specific plant-herbivore system. There is a growing amount of work on identifying herbivore elicitors and effectors, but the most significant bottleneck in the discipline is the identification and characterization of plant receptors that perceive these herbivore-specific cues.
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Affiliation(s)
- Flor E Acevedo
- Department of Entomology, Penn State University, University Park, PA 16802, USA
| | - Loren J Rivera-Vega
- Department of Entomology, Penn State University, University Park, PA 16802, USA
| | - Seung Ho Chung
- Department of Entomology, Cornell University, Ithaca, NY 14850, USA
| | - Swayamjit Ray
- Department of Plant Science, Plant Biology Graduate Program, Penn State University, University Park, PA 16802, USA
| | - Gary W Felton
- Department of Entomology, Penn State University, University Park, PA 16802, USA.
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22
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Pangesti N, Pineda A, Pieterse CMJ, Dicke M, van Loon JJA. Two-way plant mediated interactions between root-associated microbes and insects: from ecology to mechanisms. FRONTIERS IN PLANT SCIENCE 2013; 4:414. [PMID: 24167508 PMCID: PMC3805956 DOI: 10.3389/fpls.2013.00414] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 09/29/2013] [Indexed: 05/22/2023]
Abstract
Plants are members of complex communities and function as a link between above- and below-ground organisms. Associations between plants and soil-borne microbes commonly occur and have often been found beneficial for plant fitness. Root-associated microbes may trigger physiological changes in the host plant that influence interactions between plants and aboveground insects at several trophic levels. Aboveground, plants are under continuous attack by insect herbivores and mount multiple responses that also have systemic effects on belowground microbes. Until recently, both ecological and mechanistic studies have mostly focused on exploring these below- and above-ground interactions using simplified systems involving both single microbe and herbivore species, which is far from the naturally occurring interactions. Increasing the complexity of the systems studied is required to increase our understanding of microbe-plant-insect interactions and to gain more benefit from the use of non-pathogenic microbes in agriculture. In this review, we explore how colonization by either single non-pathogenic microbe species or a community of such microbes belowground affects plant growth and defense and how this affects the interactions of plants with aboveground insects at different trophic levels. Moreover, we review how plant responses to foliar herbivory by insects belonging to different feeding guilds affect interactions of plants with non-pathogenic soil-borne microbes. The role of phytohormones in coordinating plant growth, plant defenses against foliar herbivores while simultaneously establishing associations with non-pathogenic soil microbes is discussed.
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Affiliation(s)
- Nurmi Pangesti
- Laboratory of Entomology, Wageningen UniversityWageningen, Netherlands
| | - Ana Pineda
- Laboratory of Entomology, Wageningen UniversityWageningen, Netherlands
| | - Corné M. J. Pieterse
- Plant-Microbe Interactions, Institute of Environmental Biology, Utrecht UniversityUtrecht, Netherlands
| | - Marcel Dicke
- Laboratory of Entomology, Wageningen UniversityWageningen, Netherlands
| | - Joop J. A. van Loon
- Laboratory of Entomology, Wageningen UniversityWageningen, Netherlands
- *Correspondence: Joop J. A. van Loon, Laboratory of Entomology, Wageningen University, PO Box 8031, 6700 EH Wageningen, Netherlands e-mail:
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Robert CAM, Frank DL, Leach KA, Turlings TCJ, Hibbard BE, Erb M. Direct and indirect plant defenses are not suppressed by endosymbionts of a specialist root herbivore. J Chem Ecol 2013; 39:507-15. [PMID: 23440444 DOI: 10.1007/s10886-013-0264-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Revised: 01/07/2013] [Accepted: 01/29/2013] [Indexed: 01/01/2023]
Abstract
Insect endosymbionts influence many important metabolic and developmental processes of their host. It has been speculated that they may also help to manipulate and suppress plant defenses to the benefit of herbivores. Recently, endosymbionts of the root herbivore Diabrotica virgifera virgifera have been reported to suppress the induction of defensive transcripts in maize roots, which may explain the finding of another study that once attacked plants become more susceptible to subsequent D. v. virgifera attack. To test this hypothesis, we cured D. v. virgifera from its major endosymbiont Wolbachia and tested whether endosymbiont-free individuals elicit different defense responses in maize roots. The presence of Wolbachia did not alter the induction of defense marker genes and resistance in a susceptible maize hybrid and a resistant line. Furthermore, attacked maize plants emitted the same amount of (E)-β-caryophyllene, a volatile signal that serves as foraging cue for both entomopathogenic nematodes and D. v. virgifera. Finally, the effectiveness of the entomopathogenic nematode Heterorhabditis bacteriophora to infest D. v. virgifera was not changed by curing the larvae from their endosymbionts. These results show that the defense mechanisms of maize are not affected by Wolbachia. Consequently, D. v. virgifera does not seem to derive any plant-defense mediated benefits from its major endosymbiont.
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Affiliation(s)
- Christelle A M Robert
- Laboratory for Fundamental and Applied Research in Chemical Ecology (FARCE), University of Neuchâtel, Rue Emile Argand, 11, CH-2000 Neuchâtel, Switzerland
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Kissin I, Szallasi A. Therapeutic targeting of TRPV1 by resiniferatoxin, from preclinical studies to clinical trials. Curr Top Med Chem 2011. [PMID: 21671878 DOI: 10.1101/128884] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
In primary sensory neurons, the capsaicin receptor TRPV1 functions as a molecular integrator for a broad range of seemingly unrelated chemical and physical noxious stimuli, including heat and altered pH. Indeed, TRPV1 is thought to be a major transducer of the thermal hyperalgesia that follows inflammation and tissue injury as this response is impaired in TRPV1-deficient mice. Following the molecular cloning of TRPV1 in 1997, over a dozen companies embarked on efforts to find clinically useful TRPV1 antagonists, but side-effects and limited efficacy have thus far prevented any compounds from progressing beyond phase II. This has rekindled interest in desensitization of nociceptive neurons to TRPV1 agonists (e.g. capsaicin and its ultrapotent analog resiniferatoxin) as an alternative pharmacological approach to block pain in the periphery where it is generated. The clinical value of capsaicin is, however, limited by its unfavorable irritancy to desensitization ratio. In animal experiments, resiniferatoxin treatment is a powerful approach to achieve long-lasting analgesia. In patients with overactive bladder, intravesical resiniferatoxin improves bladder function (or even restores continence) without significant irritancy and/or toxicity. In this review, we argue that resiniferatoxin is an attractive alternative to capsaicin in that it achieves lasting desensitization without the side effects that complicate capsaicin therapy.
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Affiliation(s)
- Igor Kissin
- Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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