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Yang L, Demares F, Norris EJ, Bloomquist JR. Repellency, toxicity, and physiological actions of low molecular weight basic amines in mosquitoes. PEST MANAGEMENT SCIENCE 2024. [PMID: 38993039 DOI: 10.1002/ps.8281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 06/12/2024] [Accepted: 06/18/2024] [Indexed: 07/13/2024]
Abstract
BACKGROUND This study investigated the behavioral responses and toxicity of three basic amines: 1-methylpiperazine, 1-methylpyrrolidine, and triethylamine (TEA), compounds suggested previously to be anosmic in vapor exposures to caged mosquitoes. RESULTS These compounds showed repellency of Aedes aegypti mosquitoes, followed by flightlessness, knockdown, and paralysis, all increasing with exposure time and dosage. Electrophysiological experiments showed a blocking effect on nerve discharge of the Drosophila melanogaster larval central nervous system (CNS) with little evidence of hyperexcitation. Blockage of voltage-gated (Kv2) potassium channel currents under patch clamp occurred at similar concentrations. Involvement of K+ channels in the action of basic amines was supported by behavior and CNS recordings of a Shaker Kv1 mutant exposed to TEA, where instead of blockage, a hyperexcitation of nerve firing was observed. Experiments on cockroach leg mechanoreceptors demonstrated neuronal excitation and on mosquito antennae strong electroantennogram (EAG) signals with an augmentation of blank air responses after a single puff of basic amine. CONCLUSIONS The neurophysiological effects of basic amines are consistent with K+ channel block, whereas the antennal EAG response was not obviously associated with anosmia. The low-dose effects of basic amines appear to be repellency and bradykinesia. Overall, the findings provide key insights into the mechanisms underlying the biological activity of basic amines. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Liu Yang
- Emerging Pathogens Institute, Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
- Corteva Agriscience, Shanghai, China
| | - Fabien Demares
- Emerging Pathogens Institute, Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
- CEFE, University of Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - Edmund J Norris
- Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture, Agricultural Research Service, Gainesville, FL, USA
| | - Jeffrey R Bloomquist
- Emerging Pathogens Institute, Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
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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.
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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
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Tang J, Zhang Q, Qu C, Su Q, Luo C, Wang R. Knockdown of one cytochrome P450 gene CYP6DW4 increases the susceptibility of Bemisia tabaci to dimpropyridaz, a novel pyridazine pyrazolecarboxamide insecticide. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2024; 201:105888. [PMID: 38685219 DOI: 10.1016/j.pestbp.2024.105888] [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: 02/13/2024] [Revised: 03/23/2024] [Accepted: 03/24/2024] [Indexed: 05/02/2024]
Abstract
Bemisia tabaci is a formidable insect pest worldwide, and it exhibits significant resistance to various insecticides. Dimpropyridaz is a novel pyridazine pyrazolecarboxamide insecticide used against sucking insect pests, but there is little information regarding its metabolic detoxification in arthropods or cross-resistance with other insecticides. In this study, we found that dimpropyridaz shows no cross-resistance with three other popular insecticides, namely abamectin, cyantraniliprole, and flupyradifurone. After treatment of B. tabaci adults with a high dose of dimpropyridaz, higher cytochrome P450 monooxygenase (P450) activity was detected in the survivors, and the expression of the P450 gene CYP6DW4 was highly induced. Cloning and characterization of the full-length amino acid sequence of CYP6DW4 indicated that it contains conserved domains typical of P450 genes, phylogenetic analysis revealed that it was closely related to a B. tabaci protein, CYP6DW3, known to be involved in detoxification of imidacloprid. Silencing of CYP6DW4 by feeding insects with dsRNA significantly increased the susceptibility of B. tabaci to dimpropyridaz. In addition, homology modeling and molecular docking analyses showed the stable binding of dimpropyridaz to CYP6DW4, with binding free energy of -6.65 kcal/mol. Our findings indicate that CYP6DW4 plays an important role in detoxification of dimpropyridaz and possibly promotes development of resistance in B. tabaci.
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Affiliation(s)
- Juan Tang
- College of Agriculture, Yangtze University, Jingzhou 434000, China; Institute of Plant Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Key Laboratory of Environment Friendly Management on Fruit and Vegetable Pests in North China (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Beijing 100097, China
| | - Qinghe Zhang
- Institute of Plant Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Key Laboratory of Environment Friendly Management on Fruit and Vegetable Pests in North China (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Beijing 100097, China
| | - Cheng Qu
- Institute of Plant Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Key Laboratory of Environment Friendly Management on Fruit and Vegetable Pests in North China (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Beijing 100097, China
| | - Qi Su
- College of Agriculture, Yangtze University, Jingzhou 434000, China.
| | - Chen Luo
- Institute of Plant Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Key Laboratory of Environment Friendly Management on Fruit and Vegetable Pests in North China (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Beijing 100097, China
| | - Ran Wang
- Institute of Plant Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Key Laboratory of Environment Friendly Management on Fruit and Vegetable Pests in North China (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Beijing 100097, China.
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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.
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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
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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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Dai T, Yang J, Zhao C, Chen J, Zhang C, Wang Z, Peng Q, Liu P, Miao J, Liu X. Unveiling Vacuolar H +-ATPase Subunit a as the Primary Target of the Pyridinylmethyl-Benzamide Fungicide, Fluopicolide. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:1527-1538. [PMID: 38193425 DOI: 10.1021/acs.jafc.3c08485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
An estimated 240 fungicides are presently in use, but the direct targets for the majority remain elusive, constraining fungicide development and efficient resistance monitoring. In this study, we found that Pcα-actinin knockout did not influence the sensitivity of Phytophthora capsici to fluopicolide, which is a notable oomycete inhibitor. Using a combination of Bulk Segregant Analysis Sequencing and Drug Affinity Responsive Target Stability (DARTS) assays, the vacuolar H+-ATPase subunit a (PcVHA-a) was pinpointed as the target protein of fluopicolide. We also confirmed four distinct point mutations in PcVHA-a responsible for fluopicolide resistance in P. capsici through site-directed mutagenesis. Molecular docking, ATPase activity assays, and a DARTS assay suggested a fluopicolide-PcVHA-a interaction. Sequence analysis and further molecular docking validated the specificity of fluopicolide for oomycetes or fish. These findings support the claim that PcVHA-a is the target of fluopicolide, proposing vacuolar H+-ATPase as a promising target for novel fungicide development.
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Affiliation(s)
- Tan Dai
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuanxi Road, Beijing 100193, China
| | - Jikun Yang
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Chuang Zhao
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Jinzhu Chen
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Can Zhang
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuanxi Road, Beijing 100193, China
| | - Zhiwen Wang
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuanxi Road, Beijing 100193, China
| | - Qin Peng
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Pengfei Liu
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuanxi Road, Beijing 100193, China
| | - Jianqiang Miao
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Xili Liu
- State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling 712100, Shaanxi, China
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuanxi Road, Beijing 100193, China
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Zhang TY, Gong CW, Pu J, Peng AC, Li XY, Wang YM, Wang XG. Enhancement of tolerance against flonicamid in Solenopsis invicta (Hymenoptera: Formicidae) through overexpression of CYP6A14. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 197:105651. [PMID: 38072526 DOI: 10.1016/j.pestbp.2023.105651] [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: 08/28/2023] [Revised: 10/04/2023] [Accepted: 10/15/2023] [Indexed: 12/18/2023]
Abstract
Solenopsis invicta is a main issue in southern China and is causing significant damage to the local ecological environment. The extensive use of insecticides has resulted in the development of tolerance in S. invicta. In our study, ten S. invicta colonies from Sichuan Province exhibited varying degrees of tolerance against flonicamid, with LC50 values from 0.49 mg/L to 8.54 mg/L. The sensitivity of S. invicta to flonicamid significantly increased after treatment with the P450 enzyme inhibitor piperonyl butoxide (PBO). Additionally, the activity of P450 in S. invicta was significantly enhanced after being treated with flonicamid. Flonicamid induced the expression levels of CYP4aa1, CYP9e2, CYP4C1, and CYP6A14. The expression levels of these P450 genes were significantly higher in the tolerant colonies compared to the sensitive colonies, and the relative copy numbers of CYP6A14 in the tolerant colonies were 2.01-2.15 fold. RNAi feeding treatment effectively inhibited the expression of P450 genes, thereby reducing the tolerance of S. invicta against flonicamid. In addition, the overexpression of CYP6A14 in D. melanogaster resulted in reduced sensitivity to flonicamid. Our investigations revealed hydrophobic interactions between flonicamid and seven amino acid residues of CYP6A14, along with the formation of a hydrogen bond between Glu306 and flonicamid. Our findings suggest that flonicamid can effectively control S. invicta and P450 plays a pivotal role in the tolerance of S. invicta against flonicamid. The overexpression of CYP6A14 also increased tolerance to flonicamid.
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Affiliation(s)
- Tian-Yi Zhang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Chang-Wei Gong
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Jian Pu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - An-Chun Peng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Xu-Yang Li
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Yu-Meng Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China
| | - Xue-Gui Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China; College of Agriculture, Sichuan Agricultural University, Chengdu 611130, China.
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Shang J, Dong W, Fang H, Wang C, Yang H, Chen Z, Guo X, Wang H, Liang P, Shi X. Effects of dimpropyridaz on feeding behavior, locomotivity and biological parameters of Aphis gossypii. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 197:105694. [PMID: 38072549 DOI: 10.1016/j.pestbp.2023.105694] [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: 06/24/2023] [Revised: 10/30/2023] [Accepted: 11/09/2023] [Indexed: 12/18/2023]
Abstract
Aphis gossypii is a worldwide agricultural pest insect that has developed resistance to multiple pesticides. Dimpropyridaz is a new chordotonal organ regulator and has been registered for control of sap-sucking insects including A. gossypii. For the aim to effectively apply dimpropyridaz for A. gossypii control, it is necessary to clarify the toxic effects of dimpropyridaz on cotton aphids. In the present study, the effects of dimpropyridaz on feeding behavior, locomotivity and biological parameters of A. gossypii were investigated. The bioassay results showed that dimpropyridaz had good insecticidal activity against A. gossypii, with LC50 as 1.91 mg/L at 72 h post exposure. Moreover, the dimpropyridaz treated A. gossypii showed obvious poisoning symptoms of dehydration and shrivel. Through the gentle-touch experiment and feeding experiment, it was found that dimpropyridaz treatment had significant adverse impacts on the locomotivity and feeding behavior of A. gossypii. Compared with the control group, the coordinated movement ability of the treated A. gossypii attenuated, moreover the feeding behavior of A. gossypii was inhibited. The feeding rate decreased by 62.00%, 64.00% and 71.67% after treatment with 50.33 mg/L dimpropyridaz for 24 h, 48 h and 72 h, respectively. Especially, EPG recordings showed that the number of intracellular stylet puncture and the total duration of phloem sap ingestion and concurrent salivation decreased substantially, while the total duration of non-probing increased after exposure to dimpropyridaz. Furthermore, the treatments with LC10 and LC30 of dimpropyridaz significantly reduced the longevity and fecundity of F0, and led to a decrease of the relative fitness of F0 to 0.48 and 0.32, respectively. The net reproductive rate (R0) and mean generation time (T) of F1 generation were also significantly reduced, moreover the duration of reproduction was significantly shortened. In addition, at 72 h post treatment with LC30 dimpropyridaz, the gene expression levels of JHEH and USP of cotton aphids significantly increased, while the expression of FOXO, INR, EcR and INRS decreased. These results provide basis for clarifying the toxicology of dimpropyridaz to cotton aphids, and also are beneficial for effective control of cotton aphid using dimpropyridaz.
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Affiliation(s)
- Jiao Shang
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China; Sanya Institute of China Agricultural University, Sanya 572025, China
| | - Wenyang Dong
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Haibo Fang
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Cuicui Wang
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Hengli Yang
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Zhao Chen
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Xinyu Guo
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Haishan Wang
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Pei Liang
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China
| | - Xueyan Shi
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China; Sanya Institute of China Agricultural University, Sanya 572025, China.
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Zhou H, Jian Y, Shao Q, Guo F, Zhang M, Wan F, Yang L, Liu Y, Yang L, Li Y, Yang P, Li Z, Li S, Ding W. Development of Sustainable Insecticide Candidates for Protecting Pollinators: Insight into the Bioactivities, Selective Mechanism of Action and QSAR of Natural Coumarin Derivatives against Aphids. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:18359-18374. [PMID: 37965968 DOI: 10.1021/acs.jafc.3c03493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
Plants employ abundant toxic secondary metabolites to withstand insect attack, while pollinators can tolerate some natural defensive compounds. Coumarins, as promising green alternatives to chemical insecticides, possess wide application prospects in the crop protection field. Herein, the bioactivities of 30 natural coumarin derivatives against Aphis gossypii were assessed and revealed that 6-methylcoumarin exhibited potent aphicidal activity against aphids but displayed no toxicity to honeybees. Additionally, using biochemical, bioinformatic, and molecular assays, we confirmed that the action mode of 6-methylcoumarin against aphids was by inhibiting acetylcholinesterase (AChE). Meanwhile, functional assays revealed that the difference in action site, which located in Lys585 in aphid AChE (equivalent to Val548 in honeybee AChE), was the principal reason for 6-methylcoumarin being toxic to aphids but safe to pollinators. This action site was further validated by mutagenesis data, which uncovered how 6-methylcoumarin was unique selective to the aphid over honeybee or mammalian AChE. Furthermore, a 2D-QSAR model was established, revealing that the central structural feature was H3m, which offers guidance for the future design of more potent coumarin compounds. This work provides a sustainable strategy to take advantage of coumarin analogues for pest management while protecting nontarget pollinators.
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Affiliation(s)
- Hong Zhou
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Yufan Jian
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Qingyi Shao
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Fuyou Guo
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Miao Zhang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Fenglin Wan
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Liang Yang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Ying Liu
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Li Yang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Yanhong Li
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Pinglong Yang
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Zongquan Li
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Shili Li
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
| | - Wei Ding
- Institute of Pesticide Science, College of Plant Protection, Southwest University, Chongqing 400715, P.R. China
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10
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Peng YX, Liu ZY, Lin PX, Su SC, Gao CF, Wu SF. Reverse genetic study reveals the molecular targets of chordotonal organ TRPV channel modulators. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 196:105584. [PMID: 37945222 DOI: 10.1016/j.pestbp.2023.105584] [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: 07/11/2023] [Revised: 08/15/2023] [Accepted: 08/22/2023] [Indexed: 11/12/2023]
Abstract
Insecticides have been widely used for the control of insect pests that have a significant impact on agriculture and human health. A better understanding of insecticide targets is needed for effective insecticide design and resistance management. Pymetrozine, afidopyropen and flonicamid are reported to target on proteins that located on insect chordotonal organs, resulting in the disruption of insect coordination and the inhibition of feeding. In this study, we systematically examined the susceptibility of six Drosophila melanogaster mutants (five transient receptor potential channels and one mechanoreceptor) to three commercially used insecticides, in order to identify the receptor subunits critical to the insect's response to insecticides. Our results showed that iav1, nan36aand wtrw1 mutants exhibited significantly reduced susceptibility to pymetrozine and afidopyropen, but not to flonicamid. The number of eggs produced by the three mutant females were significantly less than that of the w1118 strain. Meanwhile, the longevity of all male mutants and females of nan36a and wtrw1 mutants was significantly shorter than that of the w1118 strain as the control. However, we observed no gravitaxis defects in wtrw1 mutants and the anti-gravitaxis of wtrw1 mutants was abolished by pymetrozine. Behavioral assays using thermogenetic tools further confirmed the bioassay results and supported the idea that Nan as a TRPV subfamily member located in Drosophila chordotonal neurons, acting as a target of pymetrozine, which interferes with Drosophila and causes motor deficits with gravitaxis defects. Taken together, this study elucidates the interactions of pymetrozine and afidopyropen with TRPV channels, Nan and Iav, and TRPA channel, Wtrw. Our research provides another evidence that pymetrozine and afidopyropen might target on nan, iav and wtrw channels and provides insights into the development of sustainable pest management strategies.
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Affiliation(s)
- Yu-Xuan Peng
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya 572025, China
| | - Zhao-Yu Liu
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya 572025, China
| | - Pin-Xuan Lin
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya 572025, China
| | - Shao-Cong Su
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya 572025, China
| | - Cong-Fen Gao
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya 572025, China.
| | - Shun-Fan Wu
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Sanya Institute of Nanjing Agricultural University, Sanya 572025, China.
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11
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Spalthoff C, Salgado VL, Balu N, David MD, Hehlert P, Huang H, Jones JE, Kandasamy R, Knudsen GA, Lelito KR, Machamer JB, Nesterov A, Tomalski M, Wahl GD, Wedel BJ, Göpfert MC. The novel pyridazine pyrazolecarboxamide insecticide dimpropyridaz inhibits chordotonal organ function upstream of TRPV channels. PEST MANAGEMENT SCIENCE 2023; 79:1635-1649. [PMID: 36622360 DOI: 10.1002/ps.7352] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 12/19/2022] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Pyridazine pyrazolecarboxamides (PPCs) are a novel insecticide class discovered and optimized at BASF. Dimpropyridaz is the first PPC to be submitted for registration and controls many aphid species as well as whiteflies and other piercing-sucking insects. RESULTS Dimpropyridaz and other tertiary amide PPCs are proinsecticides that are converted in vivo into secondary amide active forms by N-dealkylation. Active secondary amide metabolites of PPCs potently inhibit the function of insect chordotonal neurons. Unlike Group 9 and 29 insecticides, which hyperactivate chordotonal neurons and increase Ca2+ levels, active metabolites of PPCs silence chordotonal neurons and decrease intracellular Ca2+ levels. Whereas the effects of Group 9 and 29 insecticides require TRPV (Transient Receptor Potential Vanilloid) channels, PPCs act in a TRPV-independent fashion, without compromising cellular responses to Group 9 and 29 insecticides, placing the molecular PPC target upstream of TRPVs. CONCLUSIONS PPCs are a new class of chordotonal organ modulator insecticide for control of piercing-sucking pests. Dimpropyridaz is a PPC proinsecticide that is activated in target insects to secondary amide forms that inhibit the firing of chordotonal organs. The inhibition occurs at a site upstream of TRPVs and is TRPV-independent, providing a novel mode of action for resistance management. © 2023 BASF Corporation. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Christian Spalthoff
- Department of Cellular Neurobiology, University of Göttingen, Göttingen, Germany
| | | | | | | | - Philip Hehlert
- Department of Cellular Neurobiology, University of Göttingen, Göttingen, Germany
| | | | | | | | | | | | | | | | | | | | | | - Martin C Göpfert
- Department of Cellular Neurobiology, University of Göttingen, Göttingen, Germany
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12
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Gao H, Yuan X, Lin X, Zhang H, Zou J, Liu Z. Reducing Expression of Salivary Protein Genes by Flonicamid Partially Contributed to Its Feeding Inhibition of the Brown Planthopper on Rice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023. [PMID: 37027537 DOI: 10.1021/acs.jafc.3c00895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Flonicamid inhibits the feeding of piercing-sucking pests as a selective systemic insecticide. The brown planthopper (BPH), Nilaparvata lugens (Stål), is one of the most serious pests on rice. During feeding, it uses its stylet to collect sap by penetrating the phloem, and at the same time, it delivers saliva into the rice plant. Insect salivary proteins play important roles in feeding and interacting with plants. Whether flonicamid affects the expression of salivary protein genes and then inhibits the feeding of BPH is not clear. Here, from 20 functionally characterized salivary proteins, we screened five salivary proteins (NlShp, NlAnnix5, Nl16, Nl32, and NlSP7) whose gene expressions were significantly inhibited by flonicamid. We performed experimental analysis on two of them (Nl16 and Nl32). RNA interference of Nl32 significantly reduced the survival rate of BPH. Electrical penetration graph (EPG) experiments showed that both flonicamid treatment and knockdown of Nl16 and Nl32 genes significantly reduced the feeding activity of N. lugens in the phloem and also reduced the honeydew excretion and fecundity. These results suggested that the inhibition of flonicamid on the feeding behavior in N. lugens might be partially attributed to its effect on the expression of salivary protein genes. This study provides a new insight into the mechanism of action of flonicamid on insect pests.
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Affiliation(s)
- Haoli Gao
- Key laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
| | - Xiaowei Yuan
- Key laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
| | - Xumin Lin
- Key laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
| | - Huihui Zhang
- Key laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
| | - Jianzheng Zou
- Key laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
| | - Zewen Liu
- Key laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
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