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Zhang Z, Liu Z, Yuan Y, Zhang W, Zhang S. Manipulation of juvenile hormone signaling by the fire blight pathogen Erwinia amylovora mediates fecundity enhancement of pear psylla. PEST MANAGEMENT SCIENCE 2024. [PMID: 39329350 DOI: 10.1002/ps.8443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 09/04/2024] [Accepted: 09/11/2024] [Indexed: 09/28/2024]
Abstract
BACKGROUND In nature, plant pathogens often rely on insect vectors for transmission. Through long-term evolution, plant pathogens and insect vectors have established a mutually beneficial symbiotic relationship. Fire blight, caused by the Gram-negative bacterium Erwinia amylovora (Eam), poses a significant global threat to apple and pear production due to its rapid dissemination among host plants of the Rosaceae family. Despite evidence of E. amylovora transmission by various insects, the association between this pathogen and the pear psylla Cacopsylla chinensis, a common vector insect in pear orchards, remains unclear. RESULTS Sampling investigations and qRT-PCR results revealed that C. chinensis, from 11 pear orchards severely affected by fire blight disease in Xinjiang of China, harbored varying levels of this pathogen. Eam-positive females exhibited significantly higher fecundity compared to Eam-negative individuals, displaying accelerated ovarian development and a notable increase in egg production. Further RNAi results revealed that juvenile hormone (JH) receptor methoprene-tolerant (CcMet) and a crucial downstream gene Krüppel-homologue 1 (CcKr-h1) mediated the fecundity improvement of C. chinensis induced by Eam. Additionally, miR-2b, which targets CcKr-h1, was identified as being involved in Eam-induced fecundity enhancement in C. chinensis. CONCLUSION This study unveils, for the first time, that Eam colonize and amplify the fecundity of C. chinensis females. Host miR-2b targets CcKr-h1 of the JH signaling pathway to regulate the heightened fecundity of C. chinensis induced by Eam. These findings not only broaden our understanding of the interaction between plant pathogens and insect vectors, but also provide novel strategies for managing fire blight and pear psylla. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Zhixian Zhang
- Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China
| | - Zhenya Liu
- The National and Local Joint Engineering Laboratory of High Efficiency and Superior-Quality Cultivation and Fruit Deep Processing Technology of Characteristic Fruit Trees in South Xinjiang, Tarim University, Alar, China
- Key Lab of Xinjiang Production and Construction Corps in Comprehensive Agricultural Pest Management in Southern Xinjiang, Tarim University, Alar, China
| | - Yulin Yuan
- The National and Local Joint Engineering Laboratory of High Efficiency and Superior-Quality Cultivation and Fruit Deep Processing Technology of Characteristic Fruit Trees in South Xinjiang, Tarim University, Alar, China
- Key Lab of Xinjiang Production and Construction Corps in Comprehensive Agricultural Pest Management in Southern Xinjiang, Tarim University, Alar, China
| | - Wangbin Zhang
- The National and Local Joint Engineering Laboratory of High Efficiency and Superior-Quality Cultivation and Fruit Deep Processing Technology of Characteristic Fruit Trees in South Xinjiang, Tarim University, Alar, China
- Key Lab of Xinjiang Production and Construction Corps in Comprehensive Agricultural Pest Management in Southern Xinjiang, Tarim University, Alar, China
| | - Songdou Zhang
- Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China
- Sanya Institute of China Agricultural University, Sanya City, China
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de Amorim Conceição LB, Santos JPN, Costa MA, Aguiar ERGR. Circulation of bee-infecting viruses in Brazil: a call for action. Braz J Microbiol 2024; 55:3037-3041. [PMID: 38898364 PMCID: PMC11405577 DOI: 10.1007/s42770-024-01425-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 06/09/2024] [Indexed: 06/21/2024] Open
Abstract
Bees are fundamental for maintaining pollination-dependent plant populations, both economically and ecologically. In Brazil, they constitute 66.3% of pollinators, contributing to an annual market value estimated at R$ 43 billion for pollination services. Unfortunately, worldwide bee populations are declining due to parasites and pathogens, more specifically viruses, alongside climate change, habitat loss, and pesticides. In this scenario, extensive research concerning bee diversity, virus diversity and surveillance, is necessary to aid the conservation of native managed pollinators and potential wild alternatives besides mitigating the emergence and spread of viral pathogens. A decrease in pollination can be a point of economic vulnerability in a country like Brazil because of its main dependence on food exports. Here we conducted a study aiming to obtain an overview of circulating viruses in bees within Brazilian territory highlighting the need for further studies to have a more realistic view of bee-infecting viruses in Brazil.
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Affiliation(s)
- Lucas Barbosa de Amorim Conceição
- Department of Biological Sciences, Center of Biotechnology and Genetics, Universidade Estadual de Santa Cruz (UESC), Ilhéus-BA, Brazil
| | - João Pedro Nunes Santos
- Department of Biological Sciences, Center of Biotechnology and Genetics, Universidade Estadual de Santa Cruz (UESC), Ilhéus-BA, Brazil
| | - Marco Antônio Costa
- Department of Biological Sciences, Center of Biotechnology and Genetics, Universidade Estadual de Santa Cruz (UESC), Ilhéus-BA, Brazil
| | - Eric Roberto Guimarães Rocha Aguiar
- Department of Biological Sciences, Center of Biotechnology and Genetics, Universidade Estadual de Santa Cruz (UESC), Ilhéus-BA, Brazil.
- Department of Engineering and Computing, Universidade Estadual de Santa Cruz, Ilhéus, BA, 45662-900, Brazil.
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Moyano A, Croce AC, Scolari F. Pathogen-Mediated Alterations of Insect Chemical Communication: From Pheromones to Behavior. Pathogens 2023; 12:1350. [PMID: 38003813 PMCID: PMC10675518 DOI: 10.3390/pathogens12111350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/10/2023] [Accepted: 11/11/2023] [Indexed: 11/26/2023] Open
Abstract
Pathogens can influence the physiology and behavior of both animal and plant hosts in a manner that promotes their own transmission and dispersal. Recent research focusing on insects has revealed that these manipulations can extend to the production of pheromones, which are pivotal in chemical communication. This review provides an overview of the current state of research and available data concerning the impacts of bacterial, viral, fungal, and eukaryotic pathogens on chemical communication across different insect orders. While our understanding of the influence of pathogenic bacteria on host chemical profiles is still limited, viral infections have been shown to induce behavioral changes in the host, such as altered pheromone production, olfaction, and locomotion. Entomopathogenic fungi affect host chemical communication by manipulating cuticular hydrocarbons and pheromone production, while various eukaryotic parasites have been observed to influence insect behavior by affecting the production of pheromones and other chemical cues. The effects induced by these infections are explored in the context of the evolutionary advantages they confer to the pathogen. The molecular mechanisms governing the observed pathogen-mediated behavioral changes, as well as the dynamic and mutually influential relationships between the pathogen and its host, are still poorly understood. A deeper comprehension of these mechanisms will prove invaluable in identifying novel targets in the perspective of practical applications aimed at controlling detrimental insect species.
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Affiliation(s)
- Andrea Moyano
- Institute of Molecular Genetics, Italian National Research Council (CNR), Via Abbiategrasso 207, I-27100 Pavia, Italy; (A.M.); (A.C.C.)
- Department of Biology and Biotechnology, University of Pavia, Via Ferrata 9, I-27100 Pavia, Italy
| | - Anna Cleta Croce
- Institute of Molecular Genetics, Italian National Research Council (CNR), Via Abbiategrasso 207, I-27100 Pavia, Italy; (A.M.); (A.C.C.)
- Department of Biology and Biotechnology, University of Pavia, Via Ferrata 9, I-27100 Pavia, Italy
| | - Francesca Scolari
- Institute of Molecular Genetics, Italian National Research Council (CNR), Via Abbiategrasso 207, I-27100 Pavia, Italy; (A.M.); (A.C.C.)
- Department of Biology and Biotechnology, University of Pavia, Via Ferrata 9, I-27100 Pavia, Italy
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da Silva LA, de Camargo BR, Rodrigues BMP, Berlitz DL, Fiuza LM, Ardisson-Araújo DMP, Ribeiro BM. Exploring viral infections in honey bee colonies: insights from a metagenomic study in southern Brazil. Braz J Microbiol 2023; 54:1447-1458. [PMID: 37531005 PMCID: PMC10485192 DOI: 10.1007/s42770-023-01078-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 07/22/2023] [Indexed: 08/03/2023] Open
Abstract
The decline in honey bee colonies in different parts of the world in recent years is due to different reasons, such as agricultural practices, climate changes, the use of chemical insecticides, and pests and diseases. Viral infections are one of the main causes leading to honey bee population declines, which have a major economic impact due to honey production and pollination. To investigate the presence of viruses in bees in southern Brazil, we used a metagenomic approach to sequence adults' samples of concentrated extracts from Apis mellifera collected in fifteen apiaries of six municipalities in the Rio Grande do Sul state, Brazil, between 2016 and 2017. High-throughput sequencing (HTS) of these samples resulted in the identification of eight previously known viruses (Apis rhabdovirus 1 (ARV-1), Acute bee paralysis virus (ABPV), Aphid lethal paralysis virus (ALPV), Black queen cell virus (BQCV), Bee Macula-like virus (BeeMLV), Deformed wing virus (DWV), Lake Sinai Virus NE (LSV), and Varroa destructor virus 3 (VDV-3)) and a thogotovirus isolate. This thogotovirus shares high amino acid identities in five of the six segments with Varroa orthomyxovirus 1, VOV-1 (98.36 to 99.34% identity). In contrast, segment 4, which codes for the main glycoprotein (GP), has no identity with VOV-1, as observed for the other segments, but shares an amino acid identity of 34-38% with other glycoproteins of viruses from the Orthomyxoviridae family. In addition, the putative thogotovirus GP also shows amino acid identities ranging from 33 to 41% with the major glycoprotein (GP64) of insect viruses of the Baculoviridae family. To our knowledge, this is the second report of a thogotovirus found in bees and given this information, this thogotovirus isolate was tentatively named Apis thogotovirus 1 (ATHOV-1). The detection of multiple viruses in bees is important to better understand the complex interactions between viruses and their hosts. By understanding these interactions, better strategies for managing viral infections in bees and protecting their populations can be developed.
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Affiliation(s)
| | | | | | - Diouneia Lisiane Berlitz
- Control Agro Bio Pesquisa E Defesa Agropecuária, Parque Tecnológico TECNOPUC/PUCRS, Porto Alegre, RS, Brazil
| | - Lidia Mariana Fiuza
- ProspectaBio - Soluções biológicas Ltda. CABIO - Control Agro Bio - Consultoria Parque Tecnológico TECNOPUC/PUCRS, Porto Alegre, RS, Brazil
| | - Daniel Mendes Pereira Ardisson-Araújo
- Cell Biology Department, University of Brasília, Brasília, DF, 70910-900, Brazil.
- Laboratory of Baculovirus, Cell Biology Department, University of Brasilia, Brasilia, DF, 70910-900, Brazil.
| | - Bergmann Morais Ribeiro
- Cell Biology Department, University of Brasília, Brasília, DF, 70910-900, Brazil.
- Laboratory of Baculovirus, Cell Biology Department, University of Brasilia, Brasilia, DF, 70910-900, Brazil.
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Eleftherianos I, Mohamed AA, Tettamanti G, Zhang W. Editorial: Insect behavioral adaptations and immune responses to stress. Front Physiol 2023; 14:1244589. [PMID: 37469556 PMCID: PMC10352936 DOI: 10.3389/fphys.2023.1244589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 06/30/2023] [Indexed: 07/21/2023] Open
Affiliation(s)
- Ioannis Eleftherianos
- Department of Biological Sciences, Infection and Innate Immunity Laboratory, The George Washington University, Washington, DC, United States
| | - Amr A. Mohamed
- Department of Entomology, Faculty of Science, Cairo University, Giza, Egypt
| | - Gianluca Tettamanti
- Department of Biotechnology and Life Sciences, University of Insubria, Varese, Italy
| | - Wei Zhang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, China
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Recart W, Bernhard R, Ng I, Garcia K, Fleming-Davies AE. Meta-Analysis of the Effects of Insect Pathogens: Implications for Plant Reproduction. Pathogens 2023; 12:pathogens12020347. [PMID: 36839619 PMCID: PMC9958737 DOI: 10.3390/pathogens12020347] [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: 01/06/2023] [Revised: 02/11/2023] [Accepted: 02/14/2023] [Indexed: 02/22/2023] Open
Abstract
Despite extensive work on both insect disease and plant reproduction, there is little research on the intersection of the two. Insect-infecting pathogens could disrupt the pollination process by affecting pollinator population density or traits. Pathogens may also infect insect herbivores and change herbivory, potentially altering resource allocation to plant reproduction. We conducted a meta-analysis to (1) summarize the literature on the effects of pathogens on insect pollinators and herbivores and (2) quantify the extent to which pathogens affect insect traits, with potential repercussions for plant reproduction. We found 39 articles that fit our criteria for inclusion, extracting 218 measures of insect traits for 21 different insect species exposed to 25 different pathogens. We detected a negative effect of pathogen exposure on insect traits, which varied by host function: pathogens had a significant negative effect on insects that were herbivores or carried multiple functions but not on insects that solely functioned as pollinators. Particular pathogen types were heavily studied in certain insect orders, with 7 of 11 viral pathogen studies conducted in Lepidoptera and 5 of 9 fungal pathogen studies conducted in Hymenoptera. Our results suggest that most studies have focused on a small set of host-pathogen pairs. To understand the implications for plant reproduction, future work is needed to directly measure the effects of pathogens on pollinator effectiveness.
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Affiliation(s)
- Wilnelia Recart
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
- Correspondence:
| | - Rover Bernhard
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
- Biology Department, Lewis and Clark College, 615 S. Palatine Hill Road, Portland, OR 97219, USA
| | - Isabella Ng
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
| | - Katherine Garcia
- Biology Department, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA
- Environmental Sciences Department, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0021, USA
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Dwyer G, Mihaljevic JR, Dukic V. Can Eco-Evo Theory Explain Population Cycles in the Field? Am Nat 2022; 199:108-125. [DOI: 10.1086/717178] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hurst MRH, Beattie A, Laugraud A, Townsend R, Sitter L, van Koten C, Harper L. Identification of Diverse Toxin Complex Clusters and an eCIS Variant in Serratia proteamaculans Pathovars of the New Zealand Grass Grub ( Costelytra Giveni) and Manuka Beetle ( Pyronota Spp.) Larvae. Microbiol Spectr 2021; 9:e0112321. [PMID: 34668742 PMCID: PMC8528098 DOI: 10.1128/spectrum.01123-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 09/08/2021] [Indexed: 12/01/2022] Open
Abstract
The grass grub endemic to New Zealand, Costelytra giveni (Coleoptera: Scarabaeidae), and the manuka beetle, Pyronota festiva and P. setosa (Coleoptera: Scarabaeidae), are prevalent pest species. Through assessment of bacterial strains isolated from diseased cadavers of these insect species, 19 insect-active Serratia proteamaculans variants and a single Serratia entomophila strain were isolated. When independently bioassayed, these isolates differed in host range, the rate of disease progression, and 12-day mortality rates, which ranged from 60 to 100% of the challenged larvae. A Pyronota spp.-derived S. proteamaculans isolate caused a transient disease phenotype in challenged C. giveni larvae, whereby larvae appeared diseased before recovering to a healthy state. Genome sequence analysis revealed that all but two of the sequenced isolates contained a variant of the S. entomophila amber-disease-associated plasmid, pADAP. Each isolate also encoded one of seven distinct members of the toxin complex (Tc) family of insect-active toxins, five of which are newly described, or a member of the extracellular contractile injection (eCIS) machine family, with a new AfpX variant designated SpF. Targeted mutagenesis of each of the predicted Tc- or eCIS-encoding regions abolished or attenuated pathogenicity. Host-range testing showed that several of the S. proteamaculans Tc-encoding isolates affected both Pyronota and C. giveni species, with other isolates specific for either Pyronota spp. or C. giveni. The isolation of several distinct host-specific pathotypes of Serratia spp. may reflect pathogen-host speciation. IMPORTANCE New pathotypes of the insect pathogen Serratia, each with differing virulence attributes and host specificity toward larvae of the New Zealand manuka beetle and grass grub, have been identified. All of the Serratia proteamaculans isolates contained one of seven different insect-active toxin clusters or one of three eCIS variants. The diversity of these Serratia-encoded virulence clusters, resulting in differences in larval disease progression and host specificity in endemic scarab larvae, suggests speciation of these pathogens with their insect hosts. The differing virulence properties of these Serratia species may affect their potential infectivity and distribution among the insect populations. Based on their differing geographic isolation and pathotypes, several of these Serratia isolates, including the manuka beetle-active isolates, are likely to be more effective biopesticides in specific environments or could be used in combination for greater effect.
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Affiliation(s)
- Mark R. H. Hurst
- Resilient Agriculture, AgResearch, Lincoln Research Centre, Christchurch, New Zealand
- Bio-Protection Research Centre, Lincoln University, Christchurch, New Zealand
| | - Amy Beattie
- Resilient Agriculture, AgResearch, Lincoln Research Centre, Christchurch, New Zealand
| | - Aurelie Laugraud
- Knowledge & Analytics, AgResearch, Lincoln Research Centre, Christchurch, New Zealand
| | - Richard Townsend
- Resilient Agriculture, AgResearch, Lincoln Research Centre, Christchurch, New Zealand
| | - Lesley Sitter
- Resilient Agriculture, AgResearch, Lincoln Research Centre, Christchurch, New Zealand
- Bio-Protection Research Centre, Lincoln University, Christchurch, New Zealand
| | - Chikako van Koten
- Knowledge & Analytics, AgResearch, Lincoln Research Centre, Christchurch, New Zealand
| | - Lincoln Harper
- Curtin University, Centre for Crop and Disease Management, School of Molecular and Life, Bentley, Western Australia, Australia
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