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Li J, Luo Y, Li M, Li J, Zeng T, Luo J, Chang X, Wang M, Jongsma MA, Hu H, Wang C. Nocturnal burst emissions of germacrene D from the open disk florets of pyrethrum flowers induce moths to oviposit on a nonhost and improve pollination success. THE NEW PHYTOLOGIST 2024. [PMID: 39205445 DOI: 10.1111/nph.20060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Accepted: 07/30/2024] [Indexed: 09/04/2024]
Abstract
Recent studies show that nocturnal pollinators may be more important to ecosystem function and food production than is currently appreciated. Here, we describe an agricultural field study of pyrethrum (Tanacetum cinerariifolium) flower pollination. Pyrethrum is genetically self-incompatible and thus is reliant on pollinators for seed set. Our pollinator exclusion experiment showed that nocturnal insects, particularly moths, significantly contribute to seed set and quality. We discovered that the most abundant floral volatile, the sesquiterpene (-)-germacrene D (GD), is key in attracting the noctuid moths Peridroma saucia and Helicoverpa armigera. Germacrene D synthase (GDS) gene expression regulates the specific GD production and accumulation in flowers, which, in contrast to related species, lose the habit of closing at night. We did observe that female moths also oviposited on pyrethrum leaves and flower peduncles, but found that only a small fraction of those eggs hatched. Larvae were severely stunted in development, most likely due to the presence of pyrethrin defense compounds. This example of exploitative mutualism, which blocks the reproductive success of the moth pollinator and depends on nocturnal interactions, is placed into an ecological context to explain why it may have developed.
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Affiliation(s)
- Jinjin Li
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuanyuan Luo
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
| | - Maoyuan Li
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jiawen Li
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
| | - Tuo Zeng
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jing Luo
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiangqian Chang
- Institute of Plant Protection & Soil Science, Hubei Academy of Agricultural Sciences, Wuhan, 430070, China
| | - Manqun Wang
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Maarten A Jongsma
- Business Unit Bioscience, Wageningen Plant Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands
| | - Hao Hu
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
- School of Life Sciences, Peking-Tsinghua Joint Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Caiyun Wang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan, 430070, China
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Matsuda K. Understanding pyrethrin biosynthesis: toward and beyond natural pesticide overproduction. Biochem Soc Trans 2024; 52:1927-1937. [PMID: 39136197 DOI: 10.1042/bst20240213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
Pyrethrins are natural insecticides biosynthesised by Asteraceae plants, such as Tanacetum cinerariifolium and have a long history, dating back to ancient times. Pyrethrins are often used as low-persistence and safe insecticides to control household, horticultural, and agricultural insect pests. Despite its long history of use, pyrethrin biosynthesis remains a mystery, presenting a significant opportunity to improve yields and meet the growing demand for organic agriculture. To achieve this, both genetic modification and non-genetic methods, such as chemical activation and priming, are indispensable. Plants use pyrethrins as a defence against herbivores, but pyrethrin biosynthesis pathways are shared with plant hormones and signal molecules. Hence, the insight that pyrethrins may play broader roles than those traditionally expected is invaluable to advance the basic and applied sciences of pyrethrins.
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Affiliation(s)
- Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
- Agricultural Technology and Innovation Research Institute, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
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3
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Kambou SS, Valente A, Agnew P, Hien DFDS, Yerbanga RS, Moiroux N, Dabire KR, Pennetier C, Cohuet A, Carrasco D. Non-contact detection of pyrethroids widely used in vector control by Anopheles mosquitoes. PLoS One 2024; 19:e0298512. [PMID: 38995958 PMCID: PMC11244766 DOI: 10.1371/journal.pone.0298512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 06/19/2024] [Indexed: 07/14/2024] Open
Abstract
Pyrethroids are the most widely used insecticides to control vector borne diseases including malaria. Physiological resistance mechanisms to these insecticides have been well described, whereas those for behavioral resistance remain overlooked. Field data suggest the presence of spatial sensory detection by Anopheles mosquitoes of the pyrethroid molecules used in insecticide-based control tools, such as long-lasting insecticide nets or insecticide residual spraying. This opens the way to the emergence of a wide range of behavioral adaptations among malaria vectors. However, the spatial sensory detection of these molecules is controversial and needs to be demonstrated. The goal of this study was to behaviorally characterize the non-contact detection of three of the most common pyrethroids used for malaria vector control: permethrin, deltamethrin an ⍺-cypermethrin. To reach this goal, we recorded the behavior (takeoff response) of Anopheles gambiae pyrethroid-sensitive and resistant laboratory strains, as well as field collected mosquitoes from the Gambiae Complex, when exposed to the headspace of bottles containing different doses of the insecticides at 25 and 35°C, in order to represent a range of laboratory and field temperatures. We found the proportion of laboratory susceptible and resistant female mosquitoes that took off was, in all treatments, dose and the temperature dependent. Sensitive mosquitoes were significantly more prone to take off only in the presence of ⍺-cypermethrin, whereas sensitive and resistant mosquitoes showed similar responses to permethrin and deltamethrin. Field-collected mosquitoes of the Gambiae Complex were also responsive to permethrin, independently of the species identity (An. gambiae, An. coluzzii and An. arabiensis) or their genotypes for the kdr mutation, known to confer resistance to pyrethroids. The observed ability of Anopheles spp. mosquitoes to detect insecticides without contact could favor the evolution of behavioral modifications that may allow them to avoid or reduce the adverse effect of insecticides and thus, the development of behavioral resistance.
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Affiliation(s)
- Sassan Simplice Kambou
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
- Institut de Recherche en Sciences de la Santé (IRSS), Centre National de Recherche Scientifique et Technique (CNRST), Bobo-Dioulasso, Burkina Faso
| | - Adeline Valente
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
| | - Philip Agnew
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
| | - Domonbabele François de Sales Hien
- Institut de Recherche en Sciences de la Santé (IRSS), Centre National de Recherche Scientifique et Technique (CNRST), Bobo-Dioulasso, Burkina Faso
| | - Rakiswendé Serge Yerbanga
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
- Institut des Sciences et Techniques (InSTech), Bobo-Dioulasso, Burkina Faso
| | - Nicolas Moiroux
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
| | - Kounbobr Roch Dabire
- Institut de Recherche en Sciences de la Santé (IRSS), Centre National de Recherche Scientifique et Technique (CNRST), Bobo-Dioulasso, Burkina Faso
| | | | - Anna Cohuet
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
| | - David Carrasco
- MIVEGEC, University Montpellier, IRD, CNRS, Montpellier, France
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Chen Y, Zhang C, Li W, Lan R, Chen R, Hu J, Yang C, Wang P, Tang B, Wang S. Residues of chlorpyrifos in the environment induce resistance in Aedes albopictus by affecting its olfactory system and neurotoxicity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 930:172425. [PMID: 38643874 DOI: 10.1016/j.scitotenv.2024.172425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 04/09/2024] [Accepted: 04/10/2024] [Indexed: 04/23/2024]
Abstract
Aedes albopictus, a virus-vector pest, is primarily controlled through the use of insecticides. In this study, we investigated the mechanisms of resistance in Ae. albopictus in terms of chlorpyrifos neurotoxicity to Ae. albopictus and its effects on the olfactory system. We assessed Ca2+-Mg2+-ATP levels, choline acetyltransferase (ChAT), Monoamine oxidase (MAO), odorant-binding proteins (OBPs), and olfactory receptor (OR7) gene expression in Ae. albopictus using various assays including Y-shaped tube experiments and DanioVision analysis to evaluate macromotor behavior. Our findings revealed that cumulative exposure to chlorpyrifos reduced the activity of neurotoxic Ca2+-Mg2+-ATPase and ChAT enzymes in Ae. albopictus to varying degrees, suppressed MAO-B enzyme expression, altered OBPs and OR7 expression patterns, as well as affected evasive response, physical mobility, and cumulative locomotor time under chlorpyrifos stress conditions for Ae. albopictus individuals. Consequently, these changes led to decreased feeding ability, reproductive capacity, and avoidance behavior towards natural enemies in Ae. albopictus populations exposed to chlorpyrifos stressors over time. To adapt to unfavorable living environments, Ae. albopictus may develop certain tolerance mechanisms against organophosphorus pesticides. This study provides valuable insights for guiding rational insecticide usage or dosage adjustments targeting the nervous system of Ae. albopictus.
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Affiliation(s)
- Yanrong Chen
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Chen Zhang
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Wen Li
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Ruoyun Lan
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Rufei Chen
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Jingchao Hu
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Chenyu Yang
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Ping Wang
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Bin Tang
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China
| | - Shigui Wang
- College of life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, People's Republic of China.
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Vainer Y, Wang Y, Huff RM, Perets D, Sar-Shalom E, Yakir E, Ghaninia M, Coutinho-Abreu Gomes IV, Ruiz C, Rajamanickam D, Warburg A, Akbari OS, Papathanos PA, Ignell R, Riffell JA, Pitts RJ, Bohbot JD. A conserved odorant receptor underpins borneol-mediated repellency in culicine mosquitoes. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.08.01.548337. [PMID: 37577635 PMCID: PMC10418152 DOI: 10.1101/2023.08.01.548337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
The use of essential oils derived from the camphor tree to repel mosquitoes is an ancient practice that originated in Southeast Asia and gradually spread to China and across Europe via the Maritime Silk Road. The olfactory mechanisms by which these oils elicit avoidance behavior are unclear. Here we show that plant bicyclic monoterpenoids and borneol specifically activate a neural pathway that originates in the orphan olfactory receptor neuron of the capitate peg sensillum in the maxillary palp, and projects to the mediodorsal glomerulus 3 in the antennal lobe. This neuron co-locates with two olfactory receptor neurons tuned to carbon dioxide and octenol that mediate human-host detection. We also confirm that borneol elicits repellency against human-seeking female mosquitoes. Understanding the functional role of the mosquito maxillary palp is essential to investigating olfactory signal integration and host-selection behavior.
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Affiliation(s)
- Yuri Vainer
- Department of Entomology, The Hebrew University of Jerusalem, Israel
| | - Yinliang Wang
- Department of Entomology, The Hebrew University of Jerusalem, Israel
- Northeast Normal University, China
| | | | - Dor Perets
- Department of Entomology, The Hebrew University of Jerusalem, Israel
| | | | - Esther Yakir
- Department of Entomology, The Hebrew University of Jerusalem, Israel
| | - Majid Ghaninia
- Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Sweden
| | | | - Carlos Ruiz
- Department of Biology, University of Washington, USA
| | | | - A. Warburg
- Department of Microbiology and Molecular Genetics, The Hebrew University of Jerusalem, Israel
| | - Omar S. Akbari
- Division of Biological Sciences, University of California, USA
| | | | - R. Ignell
- Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Sweden
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6
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Zhou H, Ning Y, Jian Y, Zhang M, Klakong M, Guo F, Shao Q, Li Y, Yang P, Li Z, Yang L, Li S, Ding W. Functional analysis of a down-regulated transcription factor-SoxNeuroA gene involved in the acaricidal mechanism of scopoletin against spider mites. PEST MANAGEMENT SCIENCE 2024; 80:1593-1606. [PMID: 37986233 DOI: 10.1002/ps.7892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 11/11/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
BACKGROUND Insight into the mode of action of plant-derived acaricides will help in the development of sustainable control strategies for mite pests. Scopoletin, a promising plant-derived bioactive compound, displays prominent acaricidal activity against Tetranychus cinnabarinus. The transcription factor SoxNeuroA plays a vital role in maintaining calcium ion (Ca2+ ) homeostasis. Down-regulation of SoxNeuroA gene expression occurs in scopoletin-exposed mites, but the functional role of this gene remains unknown. RESULTS A SoxNeuroA gene from T. cinnabarinus (TcSoxNeuroA) was first cloned and identified. Reverse transcription polymerase chain reaction (RT-PCR), quantitative real-time polymerase chain reaction (qPCR), and Western blotting assays all confirmed that the gene expression and protein levels of TcSoxNeuroA were significantly reduced under scopoletin exposure. Furthermore, RNA interference silencing of the weakly expressed SoxNeuroA gene significantly enhanced the susceptibility of mites to scopoletin, suggesting that the acaricidal mechanism of scopoletin was mediated by the weakly expressed SoxNeuroA gene. Additionally, yeast one-hybrid (Y1H) and dual-luciferase reporter assays revealed that TcSoxNeuroA was a repressor of Orai1 Ca2+ channel gene transcription, and the key binding sequence was ATCAAAG (positions -361 to -368 of the Orai1 promoter). Importantly, site-directed mutagenesis and microscale thermophoresis assays further indicated that ASP185, ARG189, and LYS217, which were key predicted hydrogen-bonding sites in the molecular docking model, may be the vital binding sites for scopoletin in TcSoxNeuroA. CONCLUSION These results demonstrate that the acaricidal mechanism of scopoletin involves inhibition of the transcription factor SoxNeuroA, thus inducing the activation of the Orai1 Ca2+ channel, eventually leading to Ca2+ overload and lethality. Elucidation of the transcription factor-targeted mechanism for this potent plant-derived acaricide has vital implications for the design of next-generation green acaricides with novel targets. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Hong Zhou
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Yeshuang Ning
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Yufan Jian
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Miao Zhang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Matthana Klakong
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Fuyou Guo
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Qingyi Shao
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Yanhong Li
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Pinglong Yang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Zongquan Li
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Liang Yang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Shili Li
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
| | - Wei Ding
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing, P. R. China
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7
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Zhang Y, He S, He C, Zhou L, Xu O, Qiao L, Chen B, Cao Y, He Z. AsOBP1 is required for bioallethrin repellency in the malaria vector mosquito Anopheles sinensis. INSECT SCIENCE 2024. [PMID: 38389031 DOI: 10.1111/1744-7917.13332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 12/31/2023] [Accepted: 01/06/2024] [Indexed: 02/24/2024]
Abstract
The use of insecticides, primarily pyrethroids, is a pivotal strategy for mosquito control globally. Bioallethrin, the first commercially available volatile pyrethroid, can elicit spatial (i.e., noncontact) repellency to mosquitoes through the coactivation of olfactory receptor neurons and sodium channels. However, the olfactory mechanism of the repellency elicited by bioallethrin in mosquitoes is still unclear. Here, we demonstrated the involvement of AsOBP1 in the bioallethrin repellency in Anopheles sinensis, one of the main vectors of vivax malaria in China and other Southeast Asian countries. The behavioral and electrophysiological analyses in AsOrco-/- mutant found that the spatial repellency elicited by bioallethrin depended on the odorant receptor (OR)-mediated olfactory pathway. Furthermore, the repellency was reduced in the AsOBP1-/- mutant and a pyrethroid-resistant strain, in which the expression of AsOBP1 was significantly decreased. Moreover, recombinant AsOBP1 protein bound to bioallethrin in an in vitro competition assay. These results indicate that activation of the AsOBP1-mediated olfactory pathway is an important component of bioallethrin repellency. Our research lays the foundation for further elucidation into the olfactory mechanism of bioallethrin repellency and the behavioral modifications of pyrethroid-resistant mosquitoes.
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Affiliation(s)
- Yongjie Zhang
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Shulin He
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Chengyin He
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Ling Zhou
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Ou Xu
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Liang Qiao
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Bin Chen
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
| | - Yueqing Cao
- College of Life Sciences, Chongqing University, Chongqing, China
| | - Zhengbo He
- Chongqing Key Laboratory of Vector Insects, Institute of Entomology and Molecular Biology, Chongqing Normal University, Chongqing, China
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8
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Lin DJ, Zhang YX, Fang Y, Gao SJ, Wang R, Wang JD. The effect of chlorogenic acid, a potential botanical insecticide, on gene transcription and protein expression of carboxylesterases in the armyworm (Mythimna separata). PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 195:105575. [PMID: 37666601 DOI: 10.1016/j.pestbp.2023.105575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 07/27/2023] [Accepted: 08/08/2023] [Indexed: 09/06/2023]
Abstract
Chlorogenic acid (CGA) is a potential botanical insecticide metabolite that naturally occurs in various plants. Our previous studies revealed CGA is sufficient to control the armyworm Mythimna separata. In this study, we conducted a proteomic analysis of saliva collected from M. separata following exposure to CGA and found that differentially expressed proteins (DEPs) treated with CGA for 6 h and 24 h were primarily enriched in glutathione metabolism and the pentose phosphate pathway. Notably, we observed six carboxylesterase (CarE) proteins that were enriched at both time points. Additionally, these corresponding genes were expressed at levels 5.05 to 130.25 times higher in our laboratory-selected resistance strains. We also noted a significant increase in the enzyme activity of carboxylesterase following treatments with varying CGA concentrations. Finally, we confirmed that knockdown of MsCarE14, MsCarE28, and MsCCE001h decreased the susceptibility to CGA in resistance strain, indicating three CarE genes play crucial roles in CGA detoxification. This study presents the first report on the salivary proteomics of M. separata, offering valuable insights into the role of salivary proteins. Moreover, the determination of CarE mediated susceptibility change to CGA provides new targets for agricultural pest control and highlights the potential insecticide resistance mechanism for pest resistance management.
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Affiliation(s)
- Dong-Jiang Lin
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Ya-Xin Zhang
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yong Fang
- Hunan Agricultural Biotechnology Research Institute, Hunan Academy of Agriculture Science, Changsha 410125, China
| | - San-Ji Gao
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Ran Wang
- Institute of Plant Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
| | - Jin-da Wang
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
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9
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Zhu X, Valbon W, Qiu M, Hu CT, Yang J, Erriah B, Jankowska M, Dong K, Ward MD, Kahr B. Insecticidal and Repellent Properties of Rapid-Acting Fluorine-Containing Compounds against Aedes aegypti Mosquitoes. ACS Infect Dis 2023; 9:1396-1407. [PMID: 37311068 PMCID: PMC10353007 DOI: 10.1021/acsinfecdis.3c00161] [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: 04/07/2023] [Indexed: 06/15/2023]
Abstract
The development of safe and potent insecticides remains an integral part of a multifaceted strategy to effectively control human-disease-transmitting insect vectors. Incorporating fluorine can dramatically alter the physiochemical properties and bioavailability of insecticides. For example, 1,1,1-trichloro-2,2-bis(4-fluorophenyl)ethane (DFDT)─a difluoro congener of trichloro-2,2-bis(4-chlorophenyl)ethane (DDT)─was demonstrated previously to be 10-fold less toxic to mosquitoes than DDT in terms of LD50 values, but it exhibited a 4-fold faster knockdown. Described herein is the discovery of fluorine-containing 1-aryl-2,2,2-trichloro-ethan-1-ols (FTEs, for fluorophenyl-trichloromethyl-ethanols). FTEs, particularly per-fluorophenyl-trichloromethyl-ethanol (PFTE), exhibited rapid knockdown not only against Drosophila melanogaster but also against susceptible and resistant Aedes aegypti mosquitoes, major vectors of Dengue, Zika, yellow fever, and Chikungunya viruses. The R enantiomer of any chiral FTE, synthesized enantioselectively, exhibited faster knockdown than its corresponding S enantiomer. PFTE does not prolong the opening of mosquito sodium channels that are characteristic of the action of DDT and pyrethroid insecticides. In addition, pyrethroid/DDT-resistant Ae. aegypti strains having enhanced P450-mediated detoxification and/or carrying sodium channel mutations that confer knockdown resistance were not cross-resistant to PFTE. These results indicate a mechanism of PFTE insecticidal action distinct from that of pyrethroids or DDT. Furthermore, PFTE elicited spatial repellency at concentrations as low as 10 ppm in a hand-in-cage assay. PFTE and MFTE were found to possess low mammalian toxicity. These results suggest the substantial potential of FTEs as a new class of compounds for controlling insect vectors, including pyrethroid/DDT-resistant mosquitoes. Further investigations of FTE insecticidal and repellency mechanisms could provide important insights into how incorporation of fluorine influences the rapid lethality and mosquito sensing.
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Affiliation(s)
- Xiaolong Zhu
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
| | - Wilson Valbon
- Department
of Biology, Duke University, 130 Science Drive, Durham, North Carolina 27708 USA
| | - Mengdi Qiu
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
| | - Chunhua T. Hu
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
| | - Jingxiang Yang
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
| | - Bryan Erriah
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
| | - Milena Jankowska
- Department
of Biology, Duke University, 130 Science Drive, Durham, North Carolina 27708 USA
- Department
of Animal Physiology and Neurobiology, Nicolaus
Copernicus University, Lwowska 1 Street, Toruń 87-100, Poland
| | - Ke Dong
- Department
of Biology, Duke University, 130 Science Drive, Durham, North Carolina 27708 USA
| | - Michael D. Ward
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
| | - Bart Kahr
- Department
of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003 USA
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10
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Andreazza F, Valbon W, Dong K. Transfluthrin enhances odorant receptor-mediated spatial repellency in Aedes aegypti. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 192:105387. [PMID: 37105616 DOI: 10.1016/j.pestbp.2023.105387] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/21/2023] [Accepted: 03/06/2023] [Indexed: 06/19/2023]
Abstract
Mosquito-borne diseases are an increasing global health challenge and vector-based interventions remain the most important methods for reducing the public health burden of most mosquito-borne diseases. Transfluthrin, a volatile pyrethroid insecticide, is used widely and effectively as an insecticide and as a repellent. In a recent study, we showed that at very low concentrations transfluthrin repels Aedes aegypti mosquitoes in a hand-in-cage assay without detectable stimulation of antennal olfactory responses. Furthermore, activation of sodium channels by transfluthrin enhances repellency by DEET, which has been reported to repel mosquitoes via odorant receptor (Or)-dependent and Or-independent mechanisms. However, whether activation of sodium channels by transfluthrin can serve as a general mechanism for synergizing the activities of other repellents remain unknown. In this study, we found that, in hand-in-cage assay, transfluthrin enhanced repellency by geranyl acetate and (E)-β-farnesene, which activate AaOr31. Such enhancement was not observed in AaOr31-knockout mosquitoes and dampened in a pyrethroid-resistant strain carrying two sodium channel mutations, which reduce the action of transfluthrin on sodium channels. In addition, transfluthrin also enhanced repellency by (-)-borneol, (±)-citronellal, camphor, and eucalyptol, which activate Or-mediated repellency. Our study has uncovered the ability of transfluthrin to enhance the repellency to a variety of mosquito repellents, beyond DEET, and provided experimental support for the emerging paradigm of synergistic interactions between repellency mediated by sodium channel activation and Or activation. These findings have potential implications in the development of more effective mosquito repellent mixtures.
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Affiliation(s)
| | - Wilson Valbon
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Ke Dong
- Department of Biology, Duke University, Durham, NC 27708, USA.
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11
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S. Setlur A, Karunakaran C, Pandey S, Sarkar M, Niranjan V. Molecular interaction studies of thymol via molecular dynamic simulations and free energy calculations using multi-target approach against Aedes aegypti proteome to decipher its role as mosquito repellent. MOLECULAR SIMULATION 2022. [DOI: 10.1080/08927022.2022.2159054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Anagha S. Setlur
- Department of Biotechnology, RV College of Engineering, Bangalore, Karnataka, India
| | | | - Shruti Pandey
- Research and Development, Reckitt Benckiser India Pvt. Ltd., Gurgaon, Haryana, India
| | - Manas Sarkar
- Research and Development, Reckitt Benckiser India Pvt. Ltd., Gurgaon, Haryana, India
| | - Vidya Niranjan
- Department of Biotechnology, RV College of Engineering, Bangalore, Karnataka, India
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12
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Borges JCM, Haddi K, Valbon WR, Costa LTM, Ascêncio SD, Santos GR, Soares IM, Barbosa RS, Viana KF, Silva EAP, Moura WS, Andrade BS, Oliveira EE, Aguiar RWS. Methanolic Extracts of Chiococca alba in Aedes aegypti Biorational Management: Larvicidal and Repellent Potential, and Selectivity against Non-Target Organisms. PLANTS (BASEL, SWITZERLAND) 2022; 11:3298. [PMID: 36501335 PMCID: PMC9735851 DOI: 10.3390/plants11233298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/23/2022] [Accepted: 11/25/2022] [Indexed: 06/17/2023]
Abstract
The use of formulations containing botanical products for controlling insects that vector human and animal diseases has increased in recent years. Plant extracts seem to offer fewer risks to the environment and to human health without reducing the application strategy's efficacy when compared to synthetic and conventional insecticides and repellents. Here, we evaluated the potential of extracts obtained from caninana, Chiococca alba (L.) Hitchc. (Rubiaceae), plants as a tool to be integrated into the management of Aedes aegypti, one of the principal vectors for the transmission of arborviruses in humans. We assessed the larvicidal and repellence performance against adult mosquitoes and evaluated the potential undesired effects of the extracts on non-target organisms. We assessed the susceptibility and predatory abilities of the nymphs of Belostoma anurum, a naturally occurring mosquito larva predator, and evaluated the C. alba extract's cytotoxic effects in mammalian cell lines. Our chromatographic analysis revealed 18 compounds, including rutin, naringin, myricetin, morin, and quercetin. The methanolic extracts of C. alba showed larvicidal (LC50 = 82 (72-94) mg/mL) activity without killing or affecting the abilities of B. anurum to prey upon mosquito larvae. Our in silico predictions revealed the molecular interactions between rutin and the AeagOBP1 receptor to be one possible mechanism for the repellent potential recorded for formulations containing C. alba extracts. Low cytotoxicity against mammalian cell lines reinforces the selectivity of C. alba extracts. Collectively, our findings highlight the potential of C. alba and one of its constituents (rutin) as alternative tools to be integrated into the management of A. aegypti mosquitoes.
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Affiliation(s)
- Jaqueline C. M. Borges
- Department of Biotechnology Biodiversity, Graduate School of Biotechnology of Amazônia (Bionorte), Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Khalid Haddi
- Departmento de Entomologia, Universidade Federal de Lavras (UFLA), Lavras 37200-000, MG, Brazil
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Wilson R. Valbon
- Departmento de Entomologia, Universidade Federal de Viçosa (UFV), Viçosa 36570-900, MG, Brazil
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Lara T. M. Costa
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Sérgio D. Ascêncio
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Gil R. Santos
- Department of Biotechnology Biodiversity, Graduate School of Biotechnology of Amazônia (Bionorte), Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Ilsamar M. Soares
- Natural Products Research Laboratory, Federal University of Tocantins (UFT), Palmas 77001-090, TO, Brazil
| | - Robson S. Barbosa
- Natural Products Research Laboratory, Federal University of Tocantins (UFT), Palmas 77001-090, TO, Brazil
| | - Kelvinson F. Viana
- Interdisciplinary Center for Life Sciences and Nature, Federal University of Latin American Integration (UNILA), Foz do Iguaçu 85870-901, PR, Brazil
| | - Eder A. P. Silva
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Wellington S. Moura
- Department of Biotechnology Biodiversity, Graduate School of Biotechnology of Amazônia (Bionorte), Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
| | - Bruno S. Andrade
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
- Department of Biological Sciences, State University of Southwest Bahia, Jequié 45206-190, BA, Brazil
| | - Eugenio E. Oliveira
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
- Departmento de Entomologia, Universidade Federal de Viçosa (UFV), Viçosa 36570-900, MG, Brazil
| | - Raimundo W. S. Aguiar
- Department of Biotechnology Biodiversity, Graduate School of Biotechnology of Amazônia (Bionorte), Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
- Biotechnology Graduate Program, Federal University of Tocantins, Gurupi 77413-070, TO, Brazil
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Sugisaka Y, Aoyama S, Kumagai K, Ihara M, Matsuda K. TcGLIP GDSL Lipase Substrate Specificity Co-determines the Pyrethrin Composition in Tanacetum cinerariifolium. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:8645-8652. [PMID: 35793553 PMCID: PMC9306000 DOI: 10.1021/acs.jafc.2c02365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Natural pesticides pyrethrins biosynthesized by Tanacetum cinrerariifolium are biodegradable and safer insecticides for pest insect control. TcGLIP, a GDSL lipase underpinning the ester bond formation in pyrethrins, exhibits high stereo-specificity for acyl-CoA and alcohol substrates. However, it is unknown how the enzyme recognizes the other structural features of the substrates and whether such specificity affects the product amount and composition in T. cinrerariifolium. We report here that the cysteamine moiety in (1R,3R)-chrysanthemoyl CoA and the conjugated diene moiety in (S)-pyrethrolone play key roles in the interactions with TcGLIP. CoA released from chrysanthemoyl CoA in the pyrethrin-forming reaction reduces the substrate affinity for TcGLIP by feedback inhibition. (S)-Pyrethrolone shows the highest catalytic efficiency for TcGLIP, followed by (S)-cinerolone and (S)-jasmololone, contributing, at least in part, to determine the pyrethrin compositions in T. cinerariifolium.
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Affiliation(s)
- Yukimi Sugisaka
- Department
of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
| | - Shiori Aoyama
- Department
of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
| | - Konoka Kumagai
- Department
of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
| | - Makoto Ihara
- Department
of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
| | - Kazuhiko Matsuda
- Department
of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan
- Agricultural
Technology and Innovation Research Institute, Kindai University, 3327-204
Nakamachi, Nara 631-8505, Japan
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14
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Li JW, Zeng T, Xu ZZ, Li JJ, Hu H, Yu Q, Zhou L, Zheng RR, Luo J, Wang CY. Ribozyme-mediated CRISPR/Cas9 gene editing in pyrethrum (Tanacetum cinerariifolium) hairy roots using a RNA polymerase II-dependent promoter. PLANT METHODS 2022; 18:32. [PMID: 35292048 PMCID: PMC8925089 DOI: 10.1186/s13007-022-00863-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 02/24/2022] [Indexed: 05/14/2023]
Abstract
BACKGROUND Traditional CRISPR/Cas9 systems that rely on U6 or U3 snRNA promoters (RNA polymerase III-dependent promoters) can only achieve constitutive gene editing in plants, hampering the functional analysis of specifically expressed genes. Ribozyme-mediated CRISPR/Cas9 systems increase the types of promoters which can be used to transcribe sgRNA. Therefore, such systems allow specific gene editing; for example, transcription of the artificial gene Ribozyme-sgRNA-Ribozyme (RGR) is initiated by an RNA polymerase II-dependent promoter. Genetic transformation is indispensable for editing plant genes. In certain plant species, including pyrethrum, genetic transformation remains challenging to do, limiting the functional verification of novel CRISPR/Cas9 systems. Thus, this study's aim was to develop a simple Agrobacterium rhizogenes-mediated hairy root transformation system to analyze the function of a ribozyme-mediated CRISPR/Cas9 system in pyrethrum. RESULTS A hairy root transformation system for pyrethrum is described, with a mean transformation frequency of 7%. Transgenic hairy roots transformed with the pBI121 vector exhibited significantly increased beta-glucuronidase staining as a visual marker of transgene expression. Further, a ribozyme-based CRISPR/Cas9 vector was constructed to edit the TcEbFS gene, which catalyzes synthesis of the defense-related compound (E)-β-farnesene in pyrethrum. The vector was transferred into the hairy roots of pyrethrum and two stably transformed hairy root transgenic lines obtained. Editing of the TcEbFS gene in the hairy roots was evaluated by gene sequencing, demonstrating that both hairy root transgenic lines had DNA base loss at the editing target site. Gas chromatography-mass spectrometry showed that the (E)-β-farnesene content was significantly decreased in both hairy root transgenic lines compared with the empty vector control group. Altogether, these results show that RGR can be driven by the CaMV35S promoter to realize TcEbFS gene editing in pyrethrum hairy roots. CONCLUSION An A. rhizogenes-mediated hairy root transformation and ribozyme-mediated CRISPR/Cas9 gene editing system in pyrethrum was established, thereby facilitating gene editing in specific organs or at a particular developmental stage in future pyrethrum research.
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Affiliation(s)
- Jia-Wen Li
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Tuo Zeng
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
- School of Life Sciences, Guizhou Normal University, Guiyang, 550025, China
| | - Zhi-Zhuo Xu
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jin-Jin Li
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Hao Hu
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qin Yu
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Li Zhou
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ri-Ru Zheng
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jing Luo
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Cai-Yun Wang
- Key Laboratory for Biology of Horticultural Plants, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China.
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15
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Acheuk F, Basiouni S, Shehata AA, Dick K, Hajri H, Lasram S, Yilmaz M, Emekci M, Tsiamis G, Spona-Friedl M, May-Simera H, Eisenreich W, Ntougias S. Status and Prospects of Botanical Biopesticides in Europe and Mediterranean Countries. Biomolecules 2022; 12:biom12020311. [PMID: 35204810 PMCID: PMC8869379 DOI: 10.3390/biom12020311] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/03/2022] [Accepted: 02/09/2022] [Indexed: 02/04/2023] Open
Abstract
Concerning human and environmental health, safe alternatives to synthetic pesticides are urgently needed. Many of the currently used synthetic pesticides are not authorized for application in organic agriculture. In addition, the developed resistances of various pests against classical pesticides necessitate the urgent demand for efficient and safe products with novel modes of action. Botanical pesticides are assumed to be effective against various crop pests, and they are easily biodegradable and available in high quantities and at a reasonable cost. Many of them may act by diverse yet unexplored mechanisms of action. It is therefore surprising that only few plant species have been developed for commercial usage as biopesticides. This article reviews the status of botanical pesticides, especially in Europe and Mediterranean countries, deepening their active principles and mechanisms of action. Moreover, some constraints and challenges in the development of novel biopesticides are highlighted.
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Affiliation(s)
- Fatma Acheuk
- Laboratory for Valorization and Conservation of Biological Resources, Faculty of Sciences, University M’Hamed Bougara of Boumerdes, Boumerdes 35000, Algeria;
| | - Shereen Basiouni
- Clinical Pathology Department, Faculty of Veterinary Medicine, Benha University, Benha 13518, Egypt;
| | - Awad A. Shehata
- Research and Development Section, PerNaturam GmbH, 56290 Gödenroth, Germany;
| | - Katie Dick
- Hochschule Trier, Schneidershof, 54293 Trier, Germany;
| | - Haifa Hajri
- Laboratory of Molecular Physiology of Plants, Borj-Cedria Biotechnology Center, BP. 901, Hammam-Lif 2050, Tunisia; (H.H.); (S.L.)
| | - Salma Lasram
- Laboratory of Molecular Physiology of Plants, Borj-Cedria Biotechnology Center, BP. 901, Hammam-Lif 2050, Tunisia; (H.H.); (S.L.)
| | - Mete Yilmaz
- Department of Bioengineering, Bursa Technical University, Bursa 16310, Turkey;
| | - Mevlüt Emekci
- Department of Plant Protection, Faculty of Agriculture, Ankara University, Keçiören, Ankara 06135, Turkey;
| | - George Tsiamis
- Laboratory of Systems Microbiology and Applied Genomics, Department of Environmental Engineering, University of Patras, 2 Seferi St, 30100 Agrinio, Greece;
| | - Marina Spona-Friedl
- Bavarian NMR Center, Structural Membrane Biochemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85747 Garching, Germany;
| | - Helen May-Simera
- Institute of Molecular Physiology, Johannes Gutenberg-University of Mainz, 55128 Mainz, Germany;
| | - Wolfgang Eisenreich
- Bavarian NMR Center, Structural Membrane Biochemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, 85747 Garching, Germany;
- Correspondence: (W.E.); (S.N.)
| | - Spyridon Ntougias
- Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece
- Correspondence: (W.E.); (S.N.)
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Yao L, Liao M, Wang JK, Wang J, Liu D, Tu PF, Zeng KW. Gold Nanoparticle-Based Photo-Cross-Linking Strategy for Cellular Target Identification of Supercomplex Molecular Systems. Anal Chem 2022; 94:3180-3187. [PMID: 35133791 DOI: 10.1021/acs.analchem.1c04652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cellular target identification plays an essential role in innovative drug development and pharmacological mechanism elucidation. However, very few practical experimental methodologies have been developed for identifying target proteins for supercomplex molecular systems such as biologically active phytochemicals or pharmaceutical compositions. To overcome this limitation, we synthesized gold nanoparticles (AuNPs) as solid scaffolds, which were bound with 4,4'-dihydroxybenzophenone (DHBP) as a photo-cross-linking group on the surface. Then, DHBP-modified AuNPs cross-linked various organic compounds from phytochemicals under ultraviolet radiation via carbene reactions, H-C bond insertion, for catalytic C-C bond formation. We next used the phytochemical-cross-linked AuNPs (phytoAuNPs) to pull down potential binding proteins from brain tissue lysate and identified 13 neuroprotective targets by mass spectrometry analysis. As an exemplary study, we selected Hsp60 as a crucial cellular target to further screen 14 target-binding compounds from phytochemicals through surface plasmon resonance (SPR) analysis, followed by Hsp60 activity detection and neuroprotective effect assay in cells. Collectively, this gold nanoparticle-based photo-cross-linking strategy can serve as a useful platform for discovering novel cellular targets for supercomplex molecular systems and help to explore pharmacological mechanisms and active substances.
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Affiliation(s)
- Lu Yao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Min Liao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Jing-Kang Wang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Jing Wang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Dan Liu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Peng-Fei Tu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Ke-Wu Zeng
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
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Plant-Based Bioinsecticides for Mosquito Control: Impact on Insecticide Resistance and Disease Transmission. INSECTS 2022; 13:insects13020162. [PMID: 35206735 PMCID: PMC8878986 DOI: 10.3390/insects13020162] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/30/2022] [Accepted: 01/31/2022] [Indexed: 11/30/2022]
Abstract
Simple Summary Mosquito-borne diseases cause millions of deaths each year. There has been an increase in the use of insecticides to combat disease transmission caused by mosquitoes. Synthetic insecticides have been effectively used to protect humans from mosquito bites through insecticide-treated mosquito nets, fabrics, and indoor sprays. Despite the considerable progress made in reducing mosquito borne diseases, extensive usage of insecticides has caused serious health problems to humans and animals, insecticide resistance or insensitivity in mosquitoes, and environmental damage. A success in the fight with mosquito disease transmission can only be accomplished by adequate and effective implementation of insecticide resistance monitoring and management programs globally. For this purpose, extensive research focuses on exploring insecticide resistance mechanisms in mosquitoes and how they get resistant to chemical applications over time. The search also focuses on novel compounds that are more effective, safer, and eco-friendly for improved management of mosquito vectors. In this review, we provide the current literature on the synthetic insecticides and how mosquitoes develop resistance to them, with further emphasis on bioinsecticides that could replace conventional synthetic insecticides. In this context, plant-based compounds are explained in detail with their potential applications to control mosquitoes. Abstract The use of synthetic insecticides has been a solution to reduce mosquito-borne disease transmission for decades. Currently, no single intervention is sufficient to reduce the global disease burden caused by mosquitoes. Problems associated with extensive usage of synthetic compounds have increased substantially which makes mosquito-borne disease elimination and prevention more difficult over the years. Thus, it is crucial that much safer and effective mosquito control strategies are developed. Natural compounds from plants have been efficiently used to fight insect pests for a long time. Plant-based bioinsecticides are now considered a much safer and less toxic alternative to synthetic compounds. Here, we discuss candidate plant-based compounds that show larvicidal, adulticidal, and repellent properties. Our discussion also includes their mode of action and potential impact in mosquito disease transmission and circumvention of resistance. This review improves our knowledge on plant-based bioinsecticides and the potential for the development of state-of-the-art mosquito control strategies.
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Valbon W, Andreazza F, Oliveira EE, Liu F, Feng B, Hall M, Klimavicz J, Coats JR, Dong K. Bioallethrin activates specific olfactory sensory neurons and elicits spatial repellency in Aedes aegypti. PEST MANAGEMENT SCIENCE 2022; 78:438-445. [PMID: 34661374 PMCID: PMC8748403 DOI: 10.1002/ps.6682] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Accepted: 10/18/2021] [Indexed: 05/13/2023]
Abstract
BACKGROUND Use of pyrethroid insecticides is a pivotal strategy for mosquito control globally. Commonly known for their insecticidal activity by acting on voltage-gated sodium channels, pyrethroids, such as bioallethrin and transfluthrin, are used in mosquito coils, emanators and other vaporizers to repel mosquitoes and other biting arthropods. However, whether specific olfactory receptor neurons are activated by pyrethroids to trigger spatial repellency remains unknown. RESULTS We used behavioral and electrophysiological approaches to elucidate the mechanism of bioallethrin repellency in Aedes aegypti, a major vector of dengue, yellow fever, Zika and chikungunya viruses. We found that bioallethrin elicits spatial (i.e. non-contact) repellency and activates a specific type of olfactory receptor neuron in mosquito antennae. Furthermore, bioallethrin repellency is significantly reduced in a mosquito mutant of Orco, an obligate olfactory co-receptor that is essential for the function of odorant receptors (Ors). These results indicate that activation of specific Or(s) by bioallethrin contributes to bioallethrin repellency. In addition, bioallethrin repellency was reduced in a pyrethroid-resistant strain that carries two mutations in the sodium channel gene that are responsible for knockdown resistance (kdr) to pyrethroids, indicating a role of activation of sodium channels in bioallethrin repellency. CONCLUSION Results from this study show that bioallethrin repellency is likely to be the result of co-activation of Or(s) and sodium channels. These findings not only contribute to our understanding of the modes of action of volatile pyrethroids in spatial repellency, but also provide a framework for developing new repellents based on the dual-target mechanism revealed. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Wilson Valbon
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, MG, Brazil
- Department of Biology, Duke University, Durham, NC, USA
| | - Felipe Andreazza
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, MG, Brazil
- Department of Biology, Duke University, Durham, NC, USA
| | - Eugenio E. Oliveira
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Feng Liu
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - Bo Feng
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Institute of Health and Environment, Wenzhou Medical University, Wenzhou, China
| | - Maura Hall
- Department of Entomology, Iowa State University, Ames, IA, USA
| | - James Klimavicz
- Department of Entomology, Iowa State University, Ames, IA, USA
| | - Joel R. Coats
- Department of Entomology, Iowa State University, Ames, IA, USA
| | - Ke Dong
- Department of Entomology, Michigan State University, East Lansing, MI, USA
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, MG, Brazil
- Corresponding author: (KD)
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19
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Matsuda K. Chemical and biological studies of natural and synthetic products for the highly selective control of pest insect species. Biosci Biotechnol Biochem 2021; 86:1-11. [PMID: 34694357 DOI: 10.1093/bbb/zbab187] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 10/17/2021] [Indexed: 11/12/2022]
Abstract
Tanacetum cinerariifolium was known to produce pyrethrins, but the mechanism of pyrethrin biosynthesis was largely unclear. The author showed that the nonmevalonate and oxylipin pathways underlie biosynthesis of the acid and alcohol moieties, respectively, and a GDSL lipase joins the products of these pathways. A blend of the green leaf volatiles and (E)-β-farnesene mediates the induction of wounding responses to neighboring intact conspecies by enhancing pyrethrin biosynthesis. Plants fight against herbivores underground as well as aboveground, and, in soy pulps, some fungi produce compounds selectively modulating ion channels in insect nervous system. The author proposed that indirect defense of plants occurs where microorganisms produce defense substances in the rhizosphere. Broad-spectrum pesticides, including neonicotinoids, may affect nontarget organisms. The author discovered cofactors enabling functional expression of insect nicotinic acetylcholine receptors (nAChRs). This led to understanding the mechanism of insect nAChR-neonicotinoid interactions, thus paving new avenues for controlling crop pests and disease vectors.
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Affiliation(s)
- Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara 631-8505, Japan
- Agricultural Technology and Innovation Research Institute, Kindai University, Nara 631-8505, Japan
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Zeng T, Li JW, Zhou L, Xu ZZ, Li JJ, Hu H, Luo J, Zheng RR, Wang YY, Wang CY. Transcriptional Responses and GCMS Analysis for the Biosynthesis of Pyrethrins and Volatile Terpenes in Tanacetum coccineum. Int J Mol Sci 2021; 22:ijms222313005. [PMID: 34884809 PMCID: PMC8657971 DOI: 10.3390/ijms222313005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/26/2021] [Accepted: 11/27/2021] [Indexed: 01/24/2023] Open
Abstract
Natural pyrethrins have been widely used as natural pesticides due to their low mammalian toxicity and environmental friendliness. Previous studies have mainly focused on Tanacetumcinerariifolium, which contains high levels of pyrethrins and volatile terpenes that play significant roles in plant defense and pollination. However, there is little information on T. coccineum due to its lower pyrethrin content and low commercial value. In this study, we measured the transcriptome and metabolites of the leaves (L), flower buds (S1), and fully blossomed flowers (S4) of T. coccineum. The results show that the expression of pyrethrins and precursor terpene backbone genes was low in the leaves, and then rapidly increased in the S1 stage before decreasing again in the S4 stage. The results also show that pyrethrins primarily accumulated at the S4 stage. However, the content of volatile terpenes was consistently low. This perhaps suggests that, despite T. coccineum and T. cinerariifolium having similar gene expression patterns and accumulation of pyrethrins, T. coccineum attracts pollinators via its large and colorful flowers rather than via inefficient and metabolically expensive volatile terpenes, as in T. cinerariifolium. This is the first instance of de novo transcriptome sequencing reported for T. coccineum. The present results could provide insights into pyrethrin biosynthetic pathways and will be helpful for further understanding how plants balance the cost–benefit relationship between plant defense and pollination.
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Affiliation(s)
- Tuo Zeng
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
- School of Life Sciences, Guizhou Normal University, Guiyang 550025, China
| | - Jia-Wen Li
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Li Zhou
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Zhi-Zhuo Xu
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Jin-Jin Li
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Hao Hu
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Jing Luo
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Ri-Ru Zheng
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Yuan-Yuan Wang
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
| | - Cai-Yun Wang
- A Key Laboratory for Biology of Horticultural Plants, Ministry of Education, College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China; (T.Z.); (J.-W.L.); (L.Z.); (Z.-Z.X.); (J.-J.L.); (H.H.); (J.L.); (R.-R.Z.); (Y.-Y.W.)
- Correspondence:
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Andreazza F, Oliveira EE, Martins GF. Implications of Sublethal Insecticide Exposure and the Development of Resistance on Mosquito Physiology, Behavior, and Pathogen Transmission. INSECTS 2021; 12:insects12100917. [PMID: 34680686 PMCID: PMC8539869 DOI: 10.3390/insects12100917] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/03/2021] [Accepted: 10/04/2021] [Indexed: 12/31/2022]
Abstract
Simple Summary Mosquitoes are one of the greatest threats to human lives; they transmit a wide range of pathogens, including viruses that cause lethal diseases. Mosquitoes are found in both aquatic (as larvae or pupae) and terrestrial (as adults) environments during their complex life cycle. For decades, insecticides have been systematically used on mosquitoes with the aim to reduce their population. Little is known about how the stress resulting from the exposure of mosquitoes to insecticides impacts the tri-partite relationship between the mosquitoes, their vertebrate hosts, and the pathogens they transmit. In this work, we review existing experimental evidence to obtain a broad picture on the potential effects of the (sub)lethal exposure of hematophagous mosquitoes to different insecticides. We have focused on studies that have advanced our understanding of their physiological and behavioral responses (including the mechanisms behind insecticide resistance) and the spread of pathogens by these vectors—understudied but critically important issues for epidemiology. Studying these exposure-related effects is of paramount importance for predicting how they respond to insecticide exposure and whether this exposure makes them more or less likely to transmit pathogens. Abstract For many decades, insecticides have been used to control mosquito populations in their larval and adult stages. Although changes in the population genetics, physiology, and behavior of mosquitoes exposed to lethal and sublethal doses of insecticides are expected, the relationships between these changes and their abilities to transmit pathogens remain unclear. Thus, we conducted a comprehensive review on the sublethal effects of insecticides and their contributions to insecticide resistance in mosquitoes, with the main focus on pyrethroids. We discuss the direct and acute effects of sublethal concentrations on individuals and populations, the changes in population genetics caused by the selection for resistance after insecticide exposure, and the major mechanisms underlying such resistance. Sublethal exposures negatively impact the individual’s performance by affecting their physiology and behavior and leaving them at a disadvantage when compared to unexposed organisms. How these sublethal effects could change mosquito population sizes and diversity so that pathogen transmission risks can be affected is less clear. Furthermore, despite the beneficial and acute aspects of lethality, exposure to higher insecticide concentrations clearly impacts the population genetics by selecting resistant individuals, which may bring further and complex interactions for mosquitoes, vertebrate hosts, and pathogens. Finally, we raise several hypotheses concerning how the here revised impacts of insecticides on mosquitoes could interplay with vector-mediated pathogens’ transmission.
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Affiliation(s)
- Felipe Andreazza
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (F.A.); (E.E.O.)
| | - Eugênio E. Oliveira
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (F.A.); (E.E.O.)
| | - Gustavo Ferreira Martins
- Departamento de Biologia Geral, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil
- Correspondence:
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Liu F, Chen Z, Ye Z, Liu N. The Olfactory Chemosensation of Hematophagous Hemipteran Insects. Front Physiol 2021; 12:703768. [PMID: 34434117 PMCID: PMC8382127 DOI: 10.3389/fphys.2021.703768] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/09/2021] [Indexed: 11/13/2022] Open
Abstract
As one of the most abundant insect orders on earth, most Hemipteran insects are phytophagous, with the few hematophagous exceptions falling into two families: Cimicidae, such as bed bugs, and Reduviidae, such as kissing bugs. Many of these blood-feeding hemipteran insects are known to be realistic or potential disease vectors, presenting both physical and psychological risks for public health. Considerable researches into the interactions between hemipteran insects such as kissing bugs and bed bugs and their human hosts have revealed important information that deepens our understanding of their chemical ecology and olfactory physiology. Sensory mechanisms in the peripheral olfactory system of both insects have now been characterized, with a particular emphasis on their olfactory sensory neurons and odorant receptors. This review summarizes the findings of recent studies of both kissing bugs (including Rhodnius prolixus and Triatoma infestans) and bed bugs (Cimex lectularius), focusing on their chemical ecology and peripheral olfactory systems. Potential chemosensation-based applications for the management of these Hemipteran insect vectors are also discussed.
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Affiliation(s)
- Feng Liu
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, United States.,Department of Biological Sciences, Vanderbilt University, Nashville, TN, United States
| | - Zhou Chen
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, United States.,Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, United States
| | - Zi Ye
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, United States.,Department of Biological Sciences, Vanderbilt University, Nashville, TN, United States
| | - Nannan Liu
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, United States
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Identification of multiple odorant receptors essential for pyrethrum repellency in Drosophila melanogaster. PLoS Genet 2021; 17:e1009677. [PMID: 34237075 PMCID: PMC8291717 DOI: 10.1371/journal.pgen.1009677] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 07/20/2021] [Accepted: 06/23/2021] [Indexed: 11/19/2022] Open
Abstract
Pyrethrum extract from dry flowers of Tanacetum cinerariifolium (formally Chrysanthemum cinerariifolium) has been used globally as a popular insect repellent against arthropod pests for thousands of years. However, the mechanistic basis of pyrethrum repellency remains unknown. In this study, we found that pyrethrum spatially repels and activates olfactory responses in Drosophila melanogaster, a genetically tractable model insect, and the closely-related D. suzukii which is a serious invasive fruit crop pest. The discovery of spatial pyrethrum repellency and olfactory response to pyrethrum in D. melanogaster facilitated our identification of four odorant receptors, Or7a, Or42b, Or59b and Or98a that are responsive to pyrethrum. Further analysis showed that the first three Ors are activated by pyrethrins, the major insecticidal components in pyrethrum, whereas Or98a is activated by (E)-β-farnesene (EBF), a sesquiterpene and a minor component in pyrethrum. Importantly, knockout of Or7a, Or59b or Or98a individually abolished fly avoidance to pyrethrum, while knockout of Or42b had no effect, demonstrating that simultaneous activation of Or7a, Or59b and Or98a is required for pyrethrum repellency in D. melanogaster. Our study provides insights into the molecular basis of repellency of one of the most ancient and globally used insect repellents. Identification of pyrethrum-responsive Ors opens the door to develop new synthetic insect repellent mixtures that are highly effective and broad-spectrum. Pyrethrum extract began to be used as an insect repellent against biting arthropods and blood-sucking mosquitoes since ancient times. However, the mechanisms underlying pyrethrum repellency remains unknown. In this study, we took advantage of Drosophila melanogaster as a model insect system for olfaction studies and conducted a series of electrophysiological, molecular genetic and behavioral experiments to understand the mechanism of pyrethrum repellency in D. melanogaster. We discovered that pyrethrum repels D. melanogaster by activating multiple odorant receptors (Ors). Apparently simultaneous activation of these Ors by various components in pyrethrum extract makes pyrethrum one of the most potent and the longest used insect repellents in the human history.
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