1
|
Li ZX, Wang DX, Shi WX, Weng BY, Zhang Z, Su SH, Sun YF, Tan JF, Xiao S, Xie RH. Nitrogen-mediated volatilisation of defensive metabolites in tomato confers resistance to herbivores. PLANT, CELL & ENVIRONMENT 2024; 47:3227-3240. [PMID: 38738504 DOI: 10.1111/pce.14945] [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: 02/04/2024] [Revised: 03/29/2024] [Accepted: 04/29/2024] [Indexed: 05/14/2024]
Abstract
Plants synthesise a vast array of volatile organic compounds (VOCs), which serve as chemical defence and communication agents in their interactions with insect herbivores. Although nitrogen (N) is a critical resource in the production of plant metabolites, its regulatory effects on defensive VOCs remain largely unknown. Here, we investigated the effect of N content in tomato (Solanum lycopersicum) on the tobacco cutworm (Spodoptera litura), a notorious agricultural pest, using biochemical and molecular experiments in combination with insect behavioural and performance analyses. We observed that on tomato leaves with different N contents, S. litura showed distinct feeding preference and growth and developmental performance. Particularly, metabolomics profiling revealed that limited N availability conferred resistance upon tomato plants to S. litura is likely associated with the biosynthesis and emission of the volatile metabolite α-humulene as a repellent. Moreover, exogenous application of α-humulene on tomato leaves elicited a significant repellent response against herbivores. Thus, our findings unravel the key factors involved in N-mediated plant defence against insect herbivores and pave the way for innovation of N management to improve the plant defence responses to facilitate pest control strategies within agroecosystems.
Collapse
Affiliation(s)
- Zhi-Xing Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Dan-Xia Wang
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Wen-Xuan Shi
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Bo-Yang Weng
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Zhi Zhang
- General Management Office, Shennong Technology Group Co., Ltd, Jinzhong, China
| | - Shi-Hao Su
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Yu-Fei Sun
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Jin-Fang Tan
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Shi Xiao
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | - Ruo-Han Xie
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| |
Collapse
|
2
|
da Cruz Araujo SH, Mantilla-Afanador JG, Svacina T, Nascimento TF, da Silva Lima A, Camara MBP, Viteri Jumbo LO, dos Santos GR, da Rocha CQ, de Oliveira EE. Contributions of γ-Aminobutyric Acid (GABA) Receptors for the Activities of Pectis brevipedunculata Essential Oil against Drosophila suzukii and Pollinator Bees. PLANTS (BASEL, SWITZERLAND) 2024; 13:1392. [PMID: 38794461 PMCID: PMC11124835 DOI: 10.3390/plants13101392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/11/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024]
Abstract
The γ-aminobutyric acid (GABA) receptors play pivotal roles in the transmission of neuronal information in the nervous system of insects, which has led these proteins to be targeted by synthetic and natural products. Here, we assessed the insecticidal potential of the essential oil of Pectis brevipedunculata (Gardner) Sch. Bip., a neotropical Asteraceae plant used in traditional medicine, for controlling Drosophila suzukii (Matsumura) adults by feeding exposure. By using in silico approaches, we disentangle the contribution of GABA receptors and other potential neuronal targets (e.g., acetylcholinesterase, glutathione-S-transferases) in insects that may explain the essential oil differential activities against D. suzukii and two essential pollinator bees (Apis mellifera Linnaeus and Partamona helleri Friese). Neral (26.7%) and geranial (33.9%) were the main essential oil components which killed D. suzukii with an estimated median lethal concentration (LC50) of 2.25 µL/mL. Both pollinator forager bee species, which would likely contact this compound in the field, were more tolerant to the essential oil and did not have their diet consumptions affected by the essential oil. Based on the molecular predictions for the three potential targets and the essential oil main components, a higher affinity of interaction with the GABA receptors of D. suzukii (geranial -6.2 kcal/mol; neral -5.8 kcal/mol) in relation to A. mellifera (geranial -5.2 kcal/mol; neral -4.9 kcal/mol) would contribute to explaining the difference in toxicities observed in the bioassays. Collectively, our findings indicated the involvement of GABA receptors in the potential of P. brevipedunculata essential oil as an alternative tool for controlling D. suzukii.
Collapse
Affiliation(s)
| | - Javier Guillermo Mantilla-Afanador
- Grupo de Pesquisa em Microbiologia e Biotecnologia Agroindustrial, Universidad Católica de Manizales, Rua 23 N. 60-63, Manizales 170001, Colombia;
| | - Thiago Svacina
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (S.H.d.C.A.)
| | - Tarciza Fernandes Nascimento
- Programa de Pós-Graduação em Biotecnologia, Universidade do Federal do Tocantins, Gurupi 77402-970, TO, Brazil (L.O.V.J.); (G.R.d.S.)
| | - Aldilene da Silva Lima
- Departamento de Química, Universidade Federal do Maranhão, São Luís 65080-805, MA, Brazil; (A.d.S.L.); (C.Q.d.R.)
| | - Marcos Bispo Pinheiro Camara
- Departamento de Química, Universidade Federal do Maranhão, São Luís 65080-805, MA, Brazil; (A.d.S.L.); (C.Q.d.R.)
| | - Luis Oswaldo Viteri Jumbo
- Programa de Pós-Graduação em Biotecnologia, Universidade do Federal do Tocantins, Gurupi 77402-970, TO, Brazil (L.O.V.J.); (G.R.d.S.)
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins, Gurupi 77402-970, TO, Brazil
- Programa de Pós-Graduação em Biologia Animal, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil
| | - Gil Rodrigues dos Santos
- Programa de Pós-Graduação em Biotecnologia, Universidade do Federal do Tocantins, Gurupi 77402-970, TO, Brazil (L.O.V.J.); (G.R.d.S.)
- Programa de Pós-Graduação em Ciências Florestais e Ambientais, Universidade Federal do Tocantins, Gurupi 77402-970, TO, Brazil
| | - Cláudia Quintino da Rocha
- Departamento de Química, Universidade Federal do Maranhão, São Luís 65080-805, MA, Brazil; (A.d.S.L.); (C.Q.d.R.)
| | - Eugênio Eduardo de Oliveira
- Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa 36570-900, MG, Brazil; (S.H.d.C.A.)
- Programa de Pós-Graduação em Biotecnologia, Universidade do Federal do Tocantins, Gurupi 77402-970, TO, Brazil (L.O.V.J.); (G.R.d.S.)
| |
Collapse
|
3
|
Zhou T, Wu W, Ma S, Chen J, Huang J, Qiao X. Effects of RDL GABA Receptor Point Mutants on Susceptibility to Meta-Diamide and Isoxazoline Insecticides in Drosophila melanogaster. INSECTS 2024; 15:334. [PMID: 38786890 PMCID: PMC11122182 DOI: 10.3390/insects15050334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 04/28/2024] [Accepted: 05/03/2024] [Indexed: 05/25/2024]
Abstract
Ionotropic γ-aminobutyric acid (GABA) receptors in insects, specifically those composed of the RDL (resistant to dieldrin) subunit, serve as important targets for commonly used synthetic insecticides. These insecticides belong to various chemical classes, such as phenylpyrazoles, cyclodienes, meta-diamides, and isoxazolines, with the latter two potentially binding to the transmembrane inter-subunit pocket. However, the specific amino acid residues that contribute to the high sensitivity of insect RDL receptors to these novel insecticides remain elusive. In this study, we investigated the susceptibility of seven distinct Drosophila melanogaster Rdl point mutants against four meta-diamide and isoxazoline insecticides: isocycloseram, fluxametamide, fluralaner, and broflanilide. Our findings indicate that, despite exhibiting increased sensitivity to fluralaner in vitro, the RdlI276C mutant showed resistance to isocycloseram and fluxametamide. Similarly, the double-points mutant RdlI276F+G279S also showed decreased sensitivity to the tested isoxazolines. On the other hand, the RdlG335M mutant displayed high levels of resistance to all tested insecticides. Molecular modeling and docking simulations further supported these findings, highlighting similar binding poses for these insecticides. In summary, our research provides robust in vivo evidence supporting the idea that the inter-subunit amino acids within transmembrane M1 and M3 domains form the binding site crucial for meta-diamide and isoxazoline insecticide interactions. This study highlights the complex interplay between mutations and insecticide susceptibility, paving the way for more targeted pest control strategies.
Collapse
Affiliation(s)
- Tianhao Zhou
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (T.Z.); (W.W.); (S.M.); (J.H.)
| | - Weiping Wu
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (T.Z.); (W.W.); (S.M.); (J.H.)
| | - Suhan Ma
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (T.Z.); (W.W.); (S.M.); (J.H.)
| | - Jie Chen
- Collaborative Innovation Center of Green Pesticide, National Joint Engineering Laboratory of Biopesticide Preparation, Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A & F University, Hangzhou 311300, China;
| | - Jia Huang
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (T.Z.); (W.W.); (S.M.); (J.H.)
| | - Xiaomu Qiao
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China; (T.Z.); (W.W.); (S.M.); (J.H.)
- Xianghu Laboratory, Hangzhou 311231, China
| |
Collapse
|
4
|
Su C, Xie T, Jiang L, Wang Y, Wang Y, Nie R, Zhao Y, He B, Ma J, Yang Q, Hao J. Host genetics and larval host plant modulate microbiome structure and evolution underlying the intimate insect-microbe-plant interactions in Parnassius species on the Qinghai-Tibet Plateau. Ecol Evol 2024; 14:e11218. [PMID: 38606343 PMCID: PMC11007261 DOI: 10.1002/ece3.11218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 02/09/2024] [Accepted: 03/20/2024] [Indexed: 04/13/2024] Open
Abstract
Insects harbor a remarkable diversity of gut microbiomes critical for host survival, health, and fitness, but the mechanism of this structured symbiotic community remains poorly known, especially for the insect group consisting of many closely related species that inhabit the Qinghai-Tibet Plateau. Here, we firstly analyzed population-level 16S rRNA microbial dataset, comprising 11 Parnassius species covering 5 subgenera, from 14 populations mostly sampled in mountainous regions across northwestern-to-southeastern China, and meanwhile clarified the relative importance of multiple factors on gut microbial community structure and evolution. Our findings indicated that both host genetics and larval host plant modulated gut microbial diversity and community structure. Moreover, the effect analysis of host genetics and larval diet on gut microbiomes showed that host genetics played a critical role in governing the gut microbial beta diversity and the symbiotic community structure, while larval host plant remarkably influenced the functional evolution of gut microbiomes. These findings of the intimate insect-microbe-plant interactions jointly provide some new insights into the correlation among the host genetic background, larval host plant, the structure and evolution of gut microbiome, as well as the mechanisms of high-altitude adaptation in closely related species of this alpine butterfly group.
Collapse
Affiliation(s)
- Chengyong Su
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Tingting Xie
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Lijun Jiang
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Yunliang Wang
- College of Life SciencesAnhui Normal UniversityWuhuChina
- College of Physical EducationAnhui Normal UniversityWuhuChina
| | - Ying Wang
- College of Life SciencesAnhui Normal UniversityWuhuChina
- College of Physical EducationAnhui Normal UniversityWuhuChina
| | - Ruie Nie
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Youjie Zhao
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Bo He
- College of Life SciencesAnhui Normal UniversityWuhuChina
| | - Junye Ma
- Key Laboratory of Palaeobiology and Petroleum Stratigraphy, Center for Excellence in Life and Palaeoenvironment, Nanjing Institute of Geology and PaleontologyChinese Academy of SciencesNanjingChina
| | - Qun Yang
- Key Laboratory of Palaeobiology and Petroleum Stratigraphy, Center for Excellence in Life and Palaeoenvironment, Nanjing Institute of Geology and PaleontologyChinese Academy of SciencesNanjingChina
- Nanjing CollegeUniversity of Chinese Academy of SciencesNanjingChina
| | - Jiasheng Hao
- College of Life SciencesAnhui Normal UniversityWuhuChina
| |
Collapse
|
5
|
Qiao X, Zhou T, Zhang J, Zhang L, Lu Y, Huang J. Functional validation of A2'N mutation of the RDL GABA receptor against fipronil via molecular modeling and genome engineering in drosophila. PEST MANAGEMENT SCIENCE 2024; 80:1924-1929. [PMID: 38086568 DOI: 10.1002/ps.7929] [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: 09/29/2023] [Revised: 11/16/2023] [Accepted: 12/04/2023] [Indexed: 12/29/2023]
Abstract
BACKGROUND Insect RDL (resistant to dieldrin) receptors are essential pentameric ligand-gated chloride channels that mediate the neuroinhibitory effect of GABA, the chief inhibitory neurotransmitter in the central nervous system. These receptors serve as primary targets for various insecticides, including noncompetitive antagonists (NCAs) such as cyclodiene organochlorines and phenylpyrazoles, as well as allosteric modulators like meta-diamides and isoxazolines. This study focuses on a newly discovered A2'N mutation within the RDL receptors, identified in fipronil-resistant planthoppers. Despite in vitro electrophysiological studies have proposed its role in conferring target-site resistance, in vivo genetic functional validation of this mutation remains unexplored. RESULTS Our research employed toxicity bioassays, assessing various Rdl genotypes against a spectrum of insecticides, including fipronil, α-endosulfan, broflanilide, and isocycloseram. Results revealed distinct resistance profiles for A2'N and A2'S mutants, indicating different binding interactions of RDL receptors with NCAs. Significantly, the A2'N heterozygote showed substantial resistance to fipronil, despite its homozygous lethality. Molecular modeling and docking simulations further supported these findings, highlighting unique binding poses for fipronil and α-endosulfan. CONCLUSION This study confirmed that A2'N mutation of the RDL GABA receptor confer high resistance to fipronil in vivo. The observed resistance in A2'N mutants is likely attributable to a steric hindrance mechanism, wherein the introduction of larger side chains hampers fipronil binding, even in a heterozygous state. © 2023 Society of Chemical Industry.
Collapse
Affiliation(s)
| | - Tianhao Zhou
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Jing Zhang
- Institute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang, China
| | - Lixin Zhang
- Institute of Functional Molecules, Shenyang University of Chemical Technology, Shenyang, China
| | | | - Jia Huang
- Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| |
Collapse
|
6
|
Patel A, Chavan G, Gadkari C, Singh A, Seram RD. Methemoglobinemia Following Indoxacarb Ingestion: A Unique Toxicological Presentation. Cureus 2024; 16:e59122. [PMID: 38803711 PMCID: PMC11129105 DOI: 10.7759/cureus.59122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 04/26/2024] [Indexed: 05/29/2024] Open
Abstract
Indoxacarb, an oxadiazine insecticide, is known for its selective lethality by blocking neuronal voltage-dependent sodium channels. While primarily developed to target insect populations resistant to other pesticides, its toxicity in humans remains poorly understood. We present a case of methemoglobinemia resulting from indoxacarb ingestion, a rare manifestation of its toxic effects. A 38-year-old farmer attempted suicide by ingesting the insecticide, leading to cyanosis, hypoxemia, and characteristic arterial blood gas findings indicative of methemoglobinemia. Prompt diagnosis was challenging due to the absence of specific tests, necessitating clinical suspicion. Treatment with methylene blue and supportive therapy resulted in significant clinical improvement, highlighting the importance of early intervention in managing indoxacarb poisoning. This case underscores the need for increased awareness among healthcare providers regarding the potential toxic effects of indoxacarb. It emphasizes the importance of prompt recognition and treatment of methemoglobinemia in pesticide-related poisonings. Further research is warranted to elucidate the mechanisms underlying indoxacarb toxicity in humans and to optimize treatment strategies for affected individuals.
Collapse
Affiliation(s)
- Aniket Patel
- Emergency Medicine, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Gajanan Chavan
- Emergency Medicine, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Charuta Gadkari
- Emergency Medicine, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Akhilesh Singh
- Emergency Medicine, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Rajshree D Seram
- Emergency Medicine, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| |
Collapse
|