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Ligonniere S, Bantz A, Raymond V, Goven D. Using RNA interference targeting a nicotinic acetylcholine receptor subunit to counteract insecticide accommodation mechanisms: example of the β1 subunit in the imidacloprid-accommodated American cockroach, Periplaneta americana. JOURNAL OF PESTICIDE SCIENCE 2024; 49:58-64. [PMID: 38450086 PMCID: PMC10912888 DOI: 10.1584/jpestics.d23-027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 11/30/2023] [Indexed: 03/08/2024]
Abstract
Insecticide accommodation and resistance are limiting factors to the much-needed increase in agricultural production. Various physiological and cellular modifications, such as the changes of insecticide molecular targets, have been linked to these events. Thus, a previous study demonstrated that the imidacloprid accommodation set up by the cockroach Periplaneta americana after an exposure to a sublethal dose of this insecticide involves functional alterations of two nicotinic acetylcholine receptor (nAChR) subtypes. As RNA interference (RNAi) is one of the most promising strategies for controlling pest insects, we evaluated, in this study, the use of RNAi that targets the β1 nAChR subunit to counteract the imidacloprid accommodation phenomenon in cockroaches. Interestingly, we showed that ingestion of dsRNA-β1 increased the sensitivity to imidacloprid of accommodated cockroaches. Thus, we have demonstrated for the first time that RNAi that targets an nAChR subunit can counteract the accommodation mechanism to insecticide targeting nAChRs set up by an insect.
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Ligonniere S, Raymond V, Goven D. Use of double-stranded RNA targeting β2 divergent nicotinic acetylcholine receptor subunit to control pea aphid Acyrthosiphon pisum at larval and adult stages. PEST MANAGEMENT SCIENCE 2024; 80:896-904. [PMID: 37816139 DOI: 10.1002/ps.7820] [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: 07/26/2023] [Revised: 09/20/2023] [Accepted: 10/08/2023] [Indexed: 10/12/2023]
Abstract
BACKGROUND In recent years, the use of the RNA interference technology (RNAi) has emerged as one of the new strategies for species-specific control of insect pests. Its specificity depends on the distinctiveness of the target gene sequence for a given species. In this work, we assessed in the pea aphid Acyrthosiphon pisum (A. pisum) the use of a double-stranded RNA (dsRNA) that targets the β2 divergent nicotinic acetylcholine receptor (nAChR) subunit (dsRNA-β2), which shares low sequence identity with other subunits, to control populations of this pest at different developmental stages. Because nAChRs are targeted by neonicotinoid insecticides such as imidacloprid, we also assessed the effect of dsRNA-β2 coupled to this insecticide on aphid survival. Finally, because the effect of a control agent on beneficial insect must be considered before any use of new pest management strategies, the acute toxicity of dsRNA-β2 combined with imidacloprid was evaluated on honeybee Apis mellifera. RESULTS In this work, we demonstrated that dsRNA-β2 alone has an insecticidal effect on aphid larvae and adults. Moreover, dsRNA-β2 and imidacloprid effects on aphid larvae and adults were additive, meaning that dsRNA-β2 did not alter the efficacy of imidacloprid on these two developmental stages. Also, no obvious acute toxicity on Apis mellifera was reported. CONCLUSION Using RNAi that targets β2 divergent nAChR subunit is effective alone or combined with imidacloprid to control A. pisum at larval and adult stages. Because no obvious Apis mellifera mortality has been reported, this RNAi-based pest management strategy should be considered to control insect pest. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Shi C, Tian Y, Wang Y, Guo W, Jiang W. The interaction of nicotinic acetylcholine receptor subunits Ldα3, Ldα8 and Ldβ1 with neonicotinoids in Colorado potato beetle, Leptinotarsa decemlineata. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 195:105558. [PMID: 37666594 DOI: 10.1016/j.pestbp.2023.105558] [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: 04/06/2023] [Revised: 07/14/2023] [Accepted: 07/25/2023] [Indexed: 09/06/2023]
Abstract
The Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), is an extremely destructive notifiable quarantine pest. Over the last two decades, neonicotinoid insecticides, particularly thiamethoxam and imidacloprid, have been used to control it in Xinjiang, and local field populations have developed different levels of resistance in consequence. However, the contributions of nicotinic acetylcholine receptors (nAChRs) to neonicotinoid resistance are currently poorly understood in CPB. Previous studies have shown that nAChRα1, α3, α8 and β1 are major target subunits for neonicotinoids in some model and important agricultural insects including nAChRα1 subunit of L. decemlineata (Ldα1). In this study, the expression levels of Ldα3, Ldα8 and Ldβ1 following 72 h of treatments with median lethal doses of thiamethoxam and imidacloprid were compared using real-time quantitative PCR. These genes were then individually and simultaneously knocked down with Ldα1 by RNA interference (RNAi) using a double-stranded RNA (dsRNA) feeding method for six days to explore their roles in CPB susceptibility to imidacloprid and thiamethoxam. The results showed that the expressions of Ldα3, Ldα8 and Ldβ1 were significantly decreased by 36.99-74.89% after thiamethoxam and imidacloprid treatments, compared with the control. The significant downregulation of the target genes resulting from RNAi significantly reduced the mortality of adults exposed to thiamethoxam and imidacloprid by 34.53% -56.44% and 28.78%-43.93%, respectively. Furthermore, the adult survival rates were not affected by every dsRNA-feeding treatment, while the body weight of the test adults significantly deceased after four and six days of individual gene RNAi. This study showed that Ldα3, Ldα8 and Ldβ1 are down-regulated by thiamethoxam and imidacloprid and play important roles in the tolerance of CPB to neonicotinoids.
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Affiliation(s)
- Chengcheng Shi
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Yitong Tian
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Yaqi Wang
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Wenchao Guo
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry Agriculture P.R. China, Urumqi, China
| | - Weihua Jiang
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China.
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Yin C, Gui LY, Du TH, Zhang CJ, Wei XG, Yang J, Huang MJ, Fu BL, Gong PP, Liang JJ, Liu SN, Xue H, Hu JY, Ji Y, He C, Du H, Wang C, Zhang R, Wu QJ, Yang X, Zhang YJ. Knockdown of the Nicotinic Acetylcholine Receptor β1 Subunit Decreases the Susceptibility to Five Neonicotinoid Insecticides in Whitefly ( Bemisia tabaci). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:7221-7229. [PMID: 37157975 DOI: 10.1021/acs.jafc.3c00782] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The sweet potato whitefly, Bemisia tabaci, (Gennadius) (Hemiptera:Aleyrodidae) is a global pest of crops. Neonicotinoids are efficient insecticides used for control of this pest. Insecticidal targets of neonicotinoids are insect nicotinic acetylcholine receptors (nAChRs). Here, we characterized and cloned the full length of the nAChR β1 subunit (BTβ1) in B. tabaci and confirmed the consistency of BTβ1 in B. tabaci MEAM1 and MED. Expression levels of BTβ1 in different developmental stages and body parts of adults were investigated and compared in B. tabaci MED. dsRNA was prepared to knock down BTβ1 in adult B. tabaci and significantly decreases the susceptibility to five neonicotinoid insecticides, including imidacloprid, clothianidin, thiacloprid, nitenpyram, and dinotefuran. This study indicated BTβ1 as a notable site influencing the susceptibility of B. tabaci to neonicotinoids.
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Affiliation(s)
- Cheng Yin
- Hubei Engineering Technology Center for Pest Forewarning and Management, College of Agriculture, Yangtze University, Jingzhou, Hubei 434025, People's Republic of China
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Lian-You Gui
- Hubei Engineering Technology Center for Pest Forewarning and Management, College of Agriculture, Yangtze University, Jingzhou, Hubei 434025, People's Republic of China
| | - Tian-Hua Du
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Cheng-Jia Zhang
- Hunan Provincial Key laboratory of Pesticide Biology and Precise Use Techology, Hunan Agricultural Biotechnology Research Institute, Changsha, Hunan 410125, People's Republic of China
| | - Xue-Gao Wei
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Jing Yang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Ming-Jiao Huang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Bu-Li Fu
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Pei-Pan Gong
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Jin-Jin Liang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Shao-Nan Liu
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Hu Xue
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Jin-Yu Hu
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Yao Ji
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Chao He
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - He Du
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Chao Wang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Rong Zhang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Qing-Jun Wu
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - Xin Yang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
| | - You-Jun Zhang
- State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China
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Sun H, Lin X, Zhang H, Zhang Y, Liu Z. A consensus phosphoserine within the large cytoplasmic loop of insect nAChR α8 subunits modulated interaction between 14-3-3ε and nAChRs to regulate neonicotinoid efficacy. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 192:105384. [PMID: 37105614 DOI: 10.1016/j.pestbp.2023.105384] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 02/19/2023] [Accepted: 03/03/2023] [Indexed: 06/19/2023]
Abstract
Neonicotinoids are insect-selective nicotinic acetylcholine receptors (nAChRs) agonists that are used extensively for plant protection and animal health care. Some chaperone proteins, such as 14-3-3 proteins, importantly modulate nAChRs to display the physiological and pharmacological properties. Here we found that there is a 14-3-3 binding motif RSPSTH within the cytoplasmic loop of most insect α8 subunits. In the motif, a potential phosphorylated serine residue, serine 337, was a putative protein kinase A (PKA) substrate. Using Locusta migratoria α8 subunit as a representative, here we demonstrated that Loc14-3-3ε interacted with the unique phosphoserine (α8S337) of Locα8 subunit to regulate agonist efficacy on hybrid Locα8/β2 nAChRs in Xenopus oocytes. Co-expression of Loc14-3-3ε caused a dramatic rise of maximal inward currents (Imax) of Locα8/β2 for acetylcholine and imidacloprid to 2.9-fold and 3.1-fold of that of Locα8/β2 alone. The S337A substitution of Locα8 reduced the Imax rise when Locα8S337A/β2 and Loc14-3-3ε were co-expressed. The increased agonist currents by exogenous Loc14-3-3ε on Locα8/β2 could be almost abolished by either PKA inhibitor KT5720 or 14-3-3 inhibitor difopein. The findings revealed that serine 337 within motif RSPSTH was important for the interaction between insect nAChRs and 14-3-3ε, and inhibiting the interaction would change the pharmacological property of insect nAChRs to agonist such as neonicotinoids which may provide insights to develop new targets for insecticide design.
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Affiliation(s)
- Huahua Sun
- 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; State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 30071, 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
| | - Yixi 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
| | - 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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Zhang Y, Xu X, Wang J, Shao X, Liu Z, Li Z. Molecular Mechanism of Action of Cycloxaprid, An Oxabridged cis-Nitromethylene Neonicotinoid. Int J Mol Sci 2023; 24:ijms24087511. [PMID: 37108674 PMCID: PMC10139173 DOI: 10.3390/ijms24087511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/01/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
Cycloxaprid, an oxabridged cis-nitromethylene neonicotinoid, showed high insecticidal activity in Hemipteran insect pests. In this study, the action of cycloxaprid was characterized by recombinant receptor Nlα1/rβ2 and cockroach neurons. On Nlα1/β2 in Xenopus oocytes, cycloxaprid acted as a full agonist. The imidacloprid resistance-associated mutation Y151S reduced the Imax of cycloxaprid by 37.0% and increased EC50 values by 1.9-fold, while the Imax of imidacloprid was reduced by 72.0%, and EC50 values increased by 2.3-fold. On cockroach neurons, the maximum currents elicited by cycloxaprid were only 55% of that of acetylcholine, a full agonist, but with close EC50 values of that of trans-neonicotinoids. In addition, cycloxaprid inhibited acetylcholine-evoked currents on insect neurons in a concentration-dependent manner when co-applied with acetylcholine. Cycloxaprid at low concentrations significantly inhibited the activation of nAChRs by acetylcholine, and its inhibition potency at 1 µM was higher than its activation potency on insect neurons. Two action potencies, activation, and inhibition, by cycloxaprid on insect neurons provided an explanation for its high toxicity to insect pests. In summary, as a cis-nitromethylene neonicotinoid, cycloxaprid showed high potency on both recombinant nAChR Nlα1/β2 and cockroach neurons, which guaranteed its high control effects on a variety of insect pests.
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Affiliation(s)
- Yixi Zhang
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China
| | - Xiaoyong Xu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jingting Wang
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China
| | - Xusheng Shao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Zewen Liu
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China
| | - Zhong Li
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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Wang Z, Huang W, Liu Z, Zeng J, He Z, Shu L. The neonicotinoid insecticide imidacloprid has unexpected effects on the growth and development of soil amoebae. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 869:161884. [PMID: 36716868 DOI: 10.1016/j.scitotenv.2023.161884] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 01/15/2023] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
Neonicotinoid pesticides are the most widely used insecticides worldwide and have become a global environmental issue. Previous studies have shown that imidacloprid, the most used neonicotinoid, can negatively affect a wide range of organisms, including non-target insects, fish, invertebrates, and mammals. Imidacloprid can also accumulate and persist in soils, posing threats to the terrestrial ecosystem. However, we know little about one ecologically important group of organisms, the single-celled soil protists. In this study, we used a soil amoeba, Dictyostelium discoideum, to test whether and how imidacloprid affects the growth and development of soil amoebae. We provide the first empirical evidence that environmental concentrations of imidacloprid negatively impact the fitness and development of soil amoebae. In addition, the adverse effects did not show a dose-response relationship with increased imidacloprid concentrations, where no significant difference was observed among the treatment groups. Further transcriptome analyses showed that imidacloprid affected amoeba's key DEGs related to phagocytosis, cell division, morphogenesis, and cytochrome P450. Moreover, soil amoebae show both conserved and novel transcriptional responses to imidacloprid. In conclusion, this study has expanded the non-target list of imidacloprid from animals and plants to single-celled protists, and we believe the impact of neonicotinoid pesticides on the microbiome is significantly underestimated and deserves more studies.
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Affiliation(s)
- Zihe Wang
- School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
| | - Wei Huang
- School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
| | - Zhiwei Liu
- School of Life Sciences, Jiaying University, Meizhou 514015, China
| | - Jiaxiong Zeng
- School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
| | - Zhili He
- School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
| | - Longfei Shu
- School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China.
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Yuan GR, Chen ML, Peng ML, Lei W, Meng LW, Dou W, Wang JJ. Knockdown of a Nicotinic Acetylcholine Receptor Subunit Gene Bdorβ1 Decreases Susceptibility to Oxa-Bridged trans- instead of cis-Nitromethylene Neonicotinoid Insecticides in Bactrocera dorsalis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:13554-13562. [PMID: 36224100 DOI: 10.1021/acs.jafc.2c04709] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are ligand-gated ion channels that mediate the fast action of acetylcholine in synaptic cholinergic transmissions. Insect nAChRs are the target of several classes of insecticides. Here, the full-length cDNA encoding a nAChR beta1 subunit (Bdorβ1) was identified and characterized from a destructive pest, Bactrocera dorsalis. The amino acid sequence of Bdorβ1 shows high identities to other insect nAChRs β1 subunits. Double injection of dsBdorβ1 reduced the expression of Bdorβ1 and in turn significantly decreased susceptibility to oxa-bridged trans- instead of cis-nitromethylene neonicotinoids. Our results support the involvement of Bdorβ1 in the susceptibility of B. dorsalis to oxa-bridged trans- instead of cis-nitromethylene neonicotinoids and imply that these two classes of neonicotinoids might be acting at different nAChR subtypes.
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Affiliation(s)
- Guo-Rui Yuan
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Meng-Ling Chen
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Meng-Lan Peng
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Wei Lei
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Li-Wei Meng
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Wei Dou
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
| | - Jin-Jun Wang
- Academy of Agricultural Sciences, Southwest University, Chongqing 400716, China
- Key Laboratory of Entomology and Pest Control Engineering (Chongqing), College of Plant Protection, Southwest University, Chongqing 400716, China
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Zhang BZ, Zhang MY, Li YS, Hu GL, Fan XZ, Guo TX, Zhou F, Zhang P, Wu YB, Gao YF, Gao XW. MicroRNA-263b confers imidacloprid resistance in Sitobion miscanthi (Takahashi) by regulating the expression of the nAChRβ1 subunit. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2022; 187:105218. [PMID: 36127060 DOI: 10.1016/j.pestbp.2022.105218] [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: 03/22/2022] [Revised: 07/08/2022] [Accepted: 08/26/2022] [Indexed: 06/15/2023]
Abstract
The Chinese wheat aphid Sitobion miscanthi (CWA) is an important harmful pest in wheat fields. Imidacloprid plays a critical role in controlling pests with sucking mouthparts. However, imidacloprid-resistant pests have been observed after insecticide overuse. Point mutations and low expression levels of the nicotinic acetylcholine receptor β1 (nAchRβ1) subunit are the main imidacloprid-resistant mechanisms. However, the regulatory mechanism underlying nAChRβ1 subunit expression is poorly understood. In this study, a target of miR-263b was isolated from the 5'UTR of the nAchRβ1 subunit in the CWA. Low expression levels were found in the imidacloprid-resistant strain CWA. Luciferase reporter assays showed that miR-263b could combine with the 5'UTR of the nAChRβ1 subunit and suppress its expression by binding to a site in the CWA. Aphids treated with the miR-263b agomir exhibited a significantly reduced abundance of the nAchRβ1 subunit and increased imidacloprid resistance. In contrast, aphids treated with the miR-263b antagomir exhibited significantly increased nAchRβ1 subunit abundance and decreased imidacloprid resistance. These results provide a basis for an improved understanding of the posttranscriptional regulatory mechanism of the nAChRβ1 subunit and further elucidate the function of miRNAs in regulating susceptibility to imidacloprid in the CWA. These results provide a better understanding of the mechanisms of posttranscriptional regulation of nAChRβ1 and will be helpful for further studies on the role of miRNAs in the regulation of nAChRβ1 subunit resistance in homopteran pests.
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Affiliation(s)
- Bai-Zhong Zhang
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Meng-Yuan Zhang
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Ya-She Li
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Gui-Lei Hu
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Xin-Zheng Fan
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Tian-Xin Guo
- Department of Entomology, China Agricultural University, Beijing 100193, PR China
| | - Feng Zhou
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Pei Zhang
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Yan-Bing Wu
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Yang-Fan Gao
- College of Resources and Environment, Henan engineering research center of biological pesticide & fertilizer development and synergistic application, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Xi-Wu Gao
- Department of Entomology, China Agricultural University, Beijing 100193, PR China.
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10
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Wang ZM, Li S, Shi CC, Xie LJ, Fu KY, Jiang WH. The actions of neonicotinoid insecticides on nicotinic acetylcholine subunits Ldα1 and Ldα8 of Leptinotarsa decemlineata and assembled receptors. INSECT SCIENCE 2022; 29:1387-1400. [PMID: 35038787 DOI: 10.1111/1744-7917.13005] [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: 09/16/2021] [Revised: 12/07/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
The insect nicotinic acetylcholine receptor (nAChR) is a pentameric channel protein and also a target for neonicotinoids. There are few reported studies on the molecular interactions of Leptinotarsa decemlineata nAChRs with neonicotinoids. In this study, we analyzed the response of acetylcholine and neonicotinoids (thiamethoxam [TMX], imidacloprid [IMI], and clothianidin [CLO]) on hybrid receptors constructed by nAChR α1 and α8 subunits of L. decemlineata (Ldα1 and Ldα8) co-expressed with rat β2 subunit (rβ2) at different capped RNA (cRNA) ratios in Xenopus oocytes. In addition, we evaluated the expression changes of Ldα1 and Ldα8 after median lethal dose of TMX treatment for 72 h by quantitative polymerase chain reaction (qPCR). The resulting functional nAChRs Ldα1/rβ2 and Ldα1/Ldα8/rβ2 showed different pharmacological characteristics. The neonicotinoids tested showed lower agonist affinity on Ldα1/Ldα8/rβ2 compared to Ldα1/rβ2 at same ratios of subunit cRNAs. The sensitivities of neonicotinoids tested for Ldα1/rβ2 and Ldα1/Ldα8/rβ2 at cRNA ratios of 5:1, 1:1 and 5:5:1, 1:1:1, respectively, were lower than those for nAChRs at ratios of 1:5 and 1:1:5, respectively, whereas the values of maximum response (Imax ) varied. For Ldα1/Ldα8/rβ2, a reduction of Lda8 cRNA resulted in increased sensitivity to IMI and decreased sensitivity to TMX. The expression of Ldα1 and Ldα8 significantly decreased in adults by 82.12% and 47.02%, respectively, while Ldα8 was significantly upregulated by 2.44 times in 4th instar larvae after exposure to TMX. We infer that Ldα1 and Ldα8 together play an important role in the sensitivity of L. decemlineata to neonicotinoids.
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Affiliation(s)
- Zhi-Min Wang
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Sha Li
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Cheng-Cheng Shi
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Lin-Jie Xie
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
| | - Kai-Yun Fu
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crop in Northwestern Oasis, Ministry Agriculture P.R. China, Urumqi, China
| | - Wei-Hua Jiang
- College of Plant Protection, Nanjing Agricultural University/Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education/Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing 210095, China
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11
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Xu X, Ding Q, Wang X, Wang R, Ullah F, Gao X, Song D. V101I and R81T mutations in the nicotinic acetylcholine receptor β1 subunit are associated with neonicotinoid resistance in Myzus persicae. PEST MANAGEMENT SCIENCE 2022; 78:1500-1507. [PMID: 34962090 DOI: 10.1002/ps.6768] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 12/23/2021] [Accepted: 12/28/2021] [Indexed: 06/14/2023]
Abstract
BACKGROUND The peach-potato aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae), is a major pest worldwide. The intensive use of insecticides has led to the development of resistance against neonicotinoid insecticides. The R81T mutation in the nicotinic acetylcholine receptor (nAChR) beta1 subunit is considered a crucial mechanism adaptation to neonicotinoid resistance in M. persicae and Aphis gossypii. RESULTS Resistance-related mutations (R81T and V101I) were detected in the imidacloprid-resistant M. persicae AH19 population. The V101I mutation is reported for the first time. The V101I and R81T mutations existed separately, indicating that the two mutations evolved independently. Imidacloprid resistance in the AH19 population was stable without insecticide exposure. Four mutant strains were selected from the population with stable resistance. The resistance of the AH19-T, AH19-I, and AH19-TI strains to imidacloprid, thiamethoxam, and dinotefuran was significantly increased compared with the AH19-W strain. Synergism bioassays showed that the inhibition of three detoxification enzymes did not affect imidacloprid resistance in the AH19-T and AH19-I strains. Expression of nAChR β1 subunits in the AH19-W, AH19-T, and AH19-I strains remained unchanged. CONCLUSION The V101I mutation is associated with neonicotinoid resistance in M. persicae. The resistance of the AH19-T and AH19-I strains to neonicotinoids appears to be mainly due to the R81T and V101I mutations, whereas these mutations, together with changes in the cytochrome P450 monooxygenases and nAChR expression may be responsible for the development of neonicotinoid resistance in the AH19-TI strain. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Xiao Xu
- Department of Entomology, China Agricultural University, Beijing, China
| | - Qian Ding
- Department of Entomology, China Agricultural University, Beijing, China
| | - Xiu Wang
- Department of Entomology, China Agricultural University, Beijing, China
| | - Ruijie Wang
- Department of Entomology, China Agricultural University, Beijing, China
| | - Farman Ullah
- Department of Entomology, China Agricultural University, Beijing, China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing, China
| | - Dunlun Song
- Department of Entomology, China Agricultural University, Beijing, China
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12
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Tang B, Xu K, Liu Y, Zhou Z, Karthi S, Yang H, Li C. A review of physiological resistance to insecticide stress in Nilaparvata lugens. 3 Biotech 2022; 12:84. [PMID: 35251886 PMCID: PMC8882538 DOI: 10.1007/s13205-022-03137-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 02/02/2022] [Indexed: 01/02/2023] Open
Abstract
Insecticides are widely used in agriculture as effective means to control pests. However, pests have not been completely mitigated with the increased use of insecticides. Instead, many side effects have arisen, especially the '3Rs' (resistance, resurgence, and residue). The brown planthopper, Nilaparvata lugens, is one of the most threatening rice pests. The main insecticides for controlling N. lugens belong to organochlorine, organophosphorus, carbamate, neonicotinoid and pyrethroid groups. However, metabolic enzymes, including cytochrome P450s, esterases, glutathione-S-transferases, and ATP-binding cassette transporters, effectively promote the detoxification of insecticides. Besides, mutations of neurological target sites, such as acetylcholinesterase, nicotinic acetylcholine, γ-aminobutyric acid receptor, and ryanodine receptor, result in insensitivity to insecticides. Here, we review the physiological metabolic resistance in N. lugens under insecticide stress to provide a theoretical basis for identifying and developing more effective and harmless insecticides.
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Affiliation(s)
- Bin Tang
- Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region, Department of Biology and Engineering of Environment, Guiyang University, Guiyang, 550005 People’s Republic of China ,College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121 Zhejiang People’s Republic of China
| | - Kangkang Xu
- Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region, Department of Biology and Engineering of Environment, Guiyang University, Guiyang, 550005 People’s Republic of China ,Institute of Entomology, Provincial Key Laboratory for Agricultural Pest Management of Mountainous Regions, Guizhou University, Guiyang, 550025 People’s Republic of China
| | - Yongkang Liu
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121 Zhejiang People’s Republic of China
| | - Zhongshi Zhou
- Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region, Department of Biology and Engineering of Environment, Guiyang University, Guiyang, 550005 People’s Republic of China
| | - Sengodan Karthi
- Division of Biopesticides and Environmental Toxicology, Sri Paramakalyani Centre for Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tirunelveli, Tamil Nadu 627 412 India
| | - Hong Yang
- Institute of Entomology, Provincial Key Laboratory for Agricultural Pest Management of Mountainous Regions, Guizhou University, Guiyang, 550025 People’s Republic of China
| | - Can Li
- Guizhou Provincial Key Laboratory for Rare Animal and Economic Insect of the Mountainous Region, Department of Biology and Engineering of Environment, Guiyang University, Guiyang, 550005 People’s Republic of China
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13
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Bantz A, Goven D, Siegwart M, Maugin S, Raymond V. Exposure to a sublethal dose of imidacloprid induces cellular and physiological changes in Periplaneta americana: Involvement of α2 nicotinic acetylcholine subunit in imidacloprid sensitivity. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2022; 181:105014. [PMID: 35082037 DOI: 10.1016/j.pestbp.2021.105014] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/13/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Neonicotinoids are the most important class of insecticides used as pest management tools during several decades. Exposition of insect to sublethal dose of insecticide induces physiological and cellular changes that could contribute to the adaptation of the insects in order to loss their sensitivity to insecticides. The aim of our study is to demonstrate that a subchronic exposure to a sublethal dose of a neonicotinoid imidacloprid is sufficient to induce molecular changes leading to a loss of imidacloprid sensitivity. We report that in the cockroach, Periplaneta americana, subchronic exposure to a sublethal dose of imidacloprid induced weak changes in detoxification enzyme activity and a significant decrease of the nicotinic acetylcholine α2 mRNA. This molecular effect is correlated to a decrease of imidacloprid sensitivity of cockroaches. Using RNA interference, we shown the key role of nicotinic acetylcholine α2 subunit in imidacloprid sensitivity. Thus, quantitative changes in insecticide targets lead to decreased sensitivity to insecticides. This parameter needs to be considered in order to develop sustainable insect resistance management strategies.
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Affiliation(s)
- Alexandre Bantz
- Univ Angers, INRAE, SiFCIR, SFR QUASAV, F-49000 Angers, France.
| | - Delphine Goven
- Univ Angers, INRAE, SiFCIR, SFR QUASAV, F-49000 Angers, France.
| | - Myriam Siegwart
- INRAE, UR 1115 Plantes et Systèmes de culture Horticoles (PSH), 84914 Avignon, France.
| | - Sandrine Maugin
- INRAE, UR 1115 Plantes et Systèmes de culture Horticoles (PSH), 84914 Avignon, France.
| | - Valerie Raymond
- Univ Angers, INRAE, SiFCIR, SFR QUASAV, F-49000 Angers, France.
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14
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Cheng Z, Wang D, Han S, Zuo C, He Y. Transcriptome analysis in the thiamethoxam resistance of seven-spot ladybird beetle, Coccinella septempunctata (Coleoptera: Coccinellidae). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 230:113144. [PMID: 34998260 DOI: 10.1016/j.ecoenv.2021.113144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/25/2021] [Accepted: 12/28/2021] [Indexed: 06/14/2023]
Abstract
The seven-spot ladybird beetle, Coccinella septempunctata Linnaeus (Coleoptera: Coccinellidae) has been used as the main biological control agent against all kinds of aphids in farmland and greenhouse. In this study, a thiamethoxam-resistant strain (ThR) and a susceptible strain (SS) of seven-spot ladybird beetle were established, and differentially expressed genes (DEGs) associated with thiamethoxam resistance were recorded through de novo Illumina HiSeq 4000 sequencing. A total of 53.5 Gb of clean data were obtained and finally assembled into 21,217 unigenes from ThR and SS transcriptomes. 1798 DEGs were identified between the ThR libraries and the SS libraries, including 560 up-regulated genes and 1238 down-regulated genes. Some cytochrome p450 monooxygenases (CYP450s), UDP-glycosyltransferases (UGTs), esterases (ESTs) and ATP-binding cassette (ABC) transporters were observed to be up-regulated and the nicotinic acetylcholine receptors (nAChRs) α subunit gene down-regulated in the ThR strain compared to the SS strain. This study provides genetic information for further studies on thiamethoxam resistance mechanisms in the seven-spot ladybird beetle.
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Affiliation(s)
- Zhi Cheng
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, PR China
| | - Da Wang
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, PR China
| | - Shipeng Han
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, PR China
| | - Cheng Zuo
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, PR China
| | - Yunzhuan He
- College of Plant Protection, Hebei Agricultural University, Baoding 071000, PR China.
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15
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Hou N, Zhou Z, Chen Y, Tian J, Zhang Y, Liu Z. RNA interference in Pardosa pseudoannulata, an important predatory enemy against several insect pests, through ingestion of dsRNA-expressing Escherichia coli. INSECT MOLECULAR BIOLOGY 2021; 30:624-631. [PMID: 34410024 DOI: 10.1111/imb.12731] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 07/11/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
RNA interference is an important technology for gene functional research in many organisms. The pond wolf spider (Pardosa pseudoannulata) is an important natural enemy of rice field pests. To facilitate large-scale gene functional research in this spider species and others, we developed an RNA interference (RNAi) method via ingestion of bacteria expressing dsRNA. The dsRNA targeting a cytochrome P450 monooxygenase (cyp41g2) was expressed in Escherichia coli HT115 (DE3). And then the bacterial suspension was fed to 14-20 days old spiderlings. The mRNA abundance of the target gene was significantly reduced after 3-day's ingestion of bacteria expressing dsRNA, and between day 5 and 7, RNAi efficiency remained stable. Thus, we selected 5 days as the optimum interference time. Furthermore, the bacteria resuspension containing 20 ng/μl dsRNA was selected as the optimum concentration. To evaluate the applicability of this method, three other genes with different tissue expression pattern were also selected as targets. And the mRNA abundance of all the four target genes was significantly reduced with RNAi efficiency between 66.0% and up to 86.9%. The results demonstrated that the oral delivery of bacteria expressing dsRNA would be an effective RNAi method for the gene functional study in P. pseudoannulata.
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Affiliation(s)
- N Hou
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Z Zhou
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Y Chen
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - J Tian
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Y Zhang
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
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16
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Yu SJ, Cong L, Pan Q, Ding LL, Lei S, Cheng LY, Fang YH, Wei ZT, Liu HQ, Ran C. Whole genome sequencing and bulked segregant analysis suggest a new mechanism of amitraz resistance in the citrus red mite, Panonychus citri (Acari: Tetranychidae). PEST MANAGEMENT SCIENCE 2021; 77:5032-5048. [PMID: 34223705 DOI: 10.1002/ps.6544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 06/17/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Amitraz is a broad-spectrum insecticide/acaricide for the control of aphids, psyllids, ticks and mites. Current evidence suggests that ticks and phytophagous mites have developed strong resistance to amitraz. Previous studies have shown that multiple mechanisms are associated with amitraz resistance in ticks, but very few reports have involved Panonychus citri. We therefore used whole genome sequencing and bulked segregant analysis (BSA) to identify the mechanism underlying P. citri's resistance to amitraz. RESULTS High-quality assembly of the whole P. citri genome was completed, resulting in a genome of approximately 83.97 Mb and a contig N50 of approximately 1.81 Mb. Gene structure predictions revealed 11 577 genes, of which 10 940 genes were annotated. Trait-associated regions in the genome were mapped with bulked segregant analysis and 38 candidate SNPs were obtained, of which T752C had the strongest correlation with the resistant trait, located at the 5' untranslated region (UTR) of the β-2R adrenergic-like octopamine receptor gene. The mutation resulted in the formation of a short hairpin loop structure in mRNA and gene expression was down-regulated by more than 50% in the amitraz-resistant strain. Validation of the T752C mutation in field populations of P. citri found that the correlation between the resistance ratio and the base mutation was 94.40%. CONCLUSION Our results suggest that this 5' UTR mutation of the β-2R octopamine receptor gene, confers amitraz resistance in P. citri. This discovery provides a new explanation for the mechanism of pest resistance: base mutations in the 5' untranslated region of target gene may regulate the susceptibility of pests to pesticides.
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Affiliation(s)
- Shi-Jiang Yu
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Lin Cong
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Qi Pan
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Li-Li Ding
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Shuang Lei
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Lu-Yan Cheng
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Yun-Hong Fang
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Zhi-Tang Wei
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Hao-Qiang Liu
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
| | - Chun Ran
- Citrus Research Institute, Southwest University/Chinese Academy of Agricultural Sciences, National Engineering Research Center for Citrus, Chongqing, China
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17
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Gao H, Lin X, Yang B, Liu Z. The roles of GSTs in fipronil resistance in Nilaparvata lugens: Over-expression and expression induction. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2021; 177:104880. [PMID: 34301351 DOI: 10.1016/j.pestbp.2021.104880] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 05/09/2021] [Accepted: 05/19/2021] [Indexed: 05/27/2023]
Abstract
As one of the most important detoxification enzymes in insects, Glutathione S-transferases (GSTs) play key roles in insecticide resistance via direct metabolism and protection against oxidative stress induced by insecticide exposure. Insect GSTs are often considered as the phase II detoxification enzymes, they have potential function to metabolize fipronil as well as its fipronil's metabolites. In the fipronil-resistant Nilaparvata lugens strain G28, GSTs' inhibitor DEM (diethyl maleate) showed the optimal synergistic effects (5.73-fold), indicating the essential roles of GSTs in the resistance to fipronil in this insect species. Four GST genes, NlGSTs1, NlGSTs2, NlGSTe1 and NlGSTd1, were found over-expressed in G28 when compared to its relative susceptible counterpart strain S28. The roles of these four GSTs in fipronil resistance were confirmed via RNAi. The four GST genes were highly over-expressed in the midgut and/or fat body with detoxification action, which might provide more chances for insects to metabolize fipronil and its metabolites. Additionally, the higher induction levels in the GST gene expression by insecticides in the midgut and/or fat body compared to the whole insect also supported the significant roles of the four GSTs in the detoxification. Above all, the results provided evidences to understand the functions of GSTs in fipronil resistance in N. lugens, and gave a reference for other insects in fipronil resistance.
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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
| | - 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
| | - Baojun Yang
- Rice Technology Research and Development Center, China National Rice Research Institute, Stadium 359, Hangzhou 310006, 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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18
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Matsuda K, Ihara M, Sattelle DB. Neonicotinoid Insecticides: Molecular Targets, Resistance, and Toxicity. Annu Rev Pharmacol Toxicol 2020; 60:241-255. [PMID: 31914891 DOI: 10.1146/annurev-pharmtox-010818-021747] [Citation(s) in RCA: 141] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Neonicotinoids have been used to protect crops and animals from insect pests since the 1990s, but there are concerns regarding their adverse effects on nontarget organisms, notably on bees. Enhanced resistance to neonicotinoids in pests is becoming well documented. We address the current understanding of neonicotinoid target site interactions, selectivity, and metabolism not only in pests but also in beneficial insects such as bees. The findings are relevant to the management of both neonicotinoids and the new generation of pesticides targeting insect nicotinic acetylcholine receptors.
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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
| | - Makoto Ihara
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara 631-8505, Japan;
| | - David B Sattelle
- Centre for Respiratory Biology, UCL Respiratory, University College London, London WC1E 6JF, United Kingdom;
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Shan T, Zhang H, Chen C, Chen A, Shi X, Gao X. Low expression levels of nicotinic acetylcholine receptor subunits Boα1 and Boβ1 are associated with imidacloprid resistance in Bradysia odoriphaga. PEST MANAGEMENT SCIENCE 2020; 76:3038-3045. [PMID: 32285608 DOI: 10.1002/ps.5854] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 03/20/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Neonicotinoid insecticide imidacloprid acts on insect nicotinic acetylcholine receptors (nAChRs). The mechanisms of insect resistance to imidacloprid include target-site alteration and increased detoxification metabolism. In Bradysia odoriphaga, cytochrome P450 monooxygenase has been found involved in metabolic resistance to imidacloprid. However, the situation of target-site related resistance to imidacloprid in B. odoriphaga is still unknown. RESULTS Nine field-collected B. odoriphaga populations showed various sensitivities to imidacloprid compared with the susceptible (SS) strain, including susceptibility, decreased susceptibility, low resistance, moderate resistance and high resistance. Seven nAChR subunit genes including α1, α2, α3, α7, α8, β1 and β3, were examined for site mutation and changes in transcription levels in field populations. No nAChR polymorphism potentially related to the resistant phenotypes was found. However, differential expression of nAChR subunit genes was found in imidacloprid resistant field population. In high imidacloprid resistant population LC-2 (93.14-fold resistance), the transcription levels of α1, α2 and β1 subunits were significantly down-regulated, while the transcription levels of α3 and α8 subunits were significantly up-regulated, compared with that in SS strain. In addition, imidacloprid acute exposure induced differential expression of nAChR subunit genes in B. odoriphaga. Furthermore, RNA interference (RNAi) suppressed the transcriptional expression of Boα1 and Boβ1, and decreased mortality of B. odoriphaga by 23.03% and 18.69%, respectively, when treated with imidacloprid. CONCLUSION These results indicated that, although no target-site mutation was found in imidacloprid resistant B. odoriphaga population, the reduced expression of α1 and β1 subunits contributed to B. odoriphaga resistance to imidacloprid. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Tisheng Shan
- Department of Entomology, China Agricultural University, Beijing, China
| | - Huihui Zhang
- Department of Entomology, China Agricultural University, Beijing, China
| | - Chengyu Chen
- Department of Entomology, China Agricultural University, Beijing, China
| | - Anqi Chen
- Department of Entomology, China Agricultural University, Beijing, China
| | - Xueyan Shi
- Department of Entomology, China Agricultural University, Beijing, China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing, China
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Liao X, Jin R, Zhang X, Ali E, Mao K, Xu P, Li J, Wan H. Characterization of sulfoxaflor resistance in the brown planthopper, Nilaparvata lugens (Stål). PEST MANAGEMENT SCIENCE 2019; 75:1646-1654. [PMID: 30488546 DOI: 10.1002/ps.5282] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 11/22/2018] [Accepted: 11/24/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Sulfoxaflor is a new insecticide for controlling Nilaparvata lugens in the field. This study was conducted to investigate the risk of resistance development, the cross-resistance spectrum and the mechanisms of sulfoxaflor resistance in N. lugens. RESULTS A sulfoxaflor-resistant strain was obtained from a field population by successive selection with sulfoxaflor for 39 generations in the laboratory. Sulfoxaflor-resistant populations showed significant levels of cross-resistance to dinotefuran, nitenpyram, thiamethoxam, clothianidin, imidacloprid and cycloxaprid. However, they exhibited only minor or no cross-resistance to isoprocarb, etofenprox, chlorpyrifos, triflumezopyrim and buprofezin. Sulfoxaflor was synergized by the inhibitor piperonyl butoxide (PBO) in the sulfoxaflor-resistant strain (SFX-SEL) with 2.69-fold relative synergistic ratios compared with the unselected strain (UNSEL). Compared with UNSEL, the P450 enzyme activity of SFX-SEL was increased 3.50 times, and eight P450 genes were upregulated more than 2.0-fold in SFX-SEL. RNAi reduced the expression of CYP6ER1 (36.87-fold change) and significantly enhanced the susceptibility of SFX-SEL to sulfoxaflor. CONCLUSION Resistance development and cross-resistance risk of sulfoxaflor-resistance in N. lugens is evident. The enhanced detoxification of P450 enzymes caused by upregulation of several P450 genes is considered to be the metabolic resistance mechanism. These results suggest that CYP6ER1 might play an important role in sulfoxaflor resistance in N. lugens. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Xun Liao
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Ruoheng Jin
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Xiaolei Zhang
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Ehsan Ali
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Kaikai Mao
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Pengfei Xu
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Jianhong Li
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
| | - Hu Wan
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, People's Republic of China
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Wang K, Zhang M, Huang Y, Yang Z, Su S, Chen M. Characterisation of imidacloprid resistance in the bird cherry-oat aphid, Rhopalosiphum padi, a serious pest on wheat crops. PEST MANAGEMENT SCIENCE 2018; 74:1457-1465. [PMID: 29266699 DOI: 10.1002/ps.4834] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 12/04/2017] [Accepted: 12/13/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Rhopalosiphum padi is a destructive insect pest of wheat worldwide. Studies have shown that R. padi has developed resistance to different insecticides, including imidacloprid. We studied the mechanisms conferring resistance to imidacloprid at the biochemical and molecular levels. RESULTS An R. padi imidacloprid-resistant (IM-R) strain and a susceptible (SS) strain were established. Fitness analysis using life-tables showed that the IM-R strain had obvious disadvantages in several parameters, indicating reduced fitness. Profiles of cross-resistance of IM-R and SS to seven insecticides were detected. Both synergistic and enzyme activity data suggested that P450 plays a role in resistance. Furthermore, the mRNA expression levels of cytochrome P450 (CYP) genes CYP6CY3-1 and CYP6CY3-2 were significantly increased in the IM-R strain. No target-site mutation within the nicotinic acetylcholine receptor (nAChR) subunits was detected in the IM-R strain. Interestingly, the expression levels of the nAChR α1, α2, α3, α7-2, and β1 subunit genes were significantly decreased, suggesting that down-regulation of these subunits may be involved in resistance. CONCLUSION Multiple mechanisms confer imidacloprid resistance in R. padi. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Kang Wang
- Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling, Shaanxi Province, China
| | - Meng Zhang
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou, Henan Province, China
| | - Yanna Huang
- Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling, Shaanxi Province, China
| | - Zhuolin Yang
- Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling, Shaanxi Province, China
| | - Sha Su
- Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling, Shaanxi Province, China
| | - Maohua Chen
- Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling, Shaanxi Province, China
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Zhang Y, Liu B, Zhang Z, Wang L, Guo H, Li Z, He P, Liu Z, Fang J. Differential Expression of P450 Genes and nAChR Subunits Associated With Imidacloprid Resistance in Laodelphax striatellus (Hemiptera: Delphacidae). JOURNAL OF ECONOMIC ENTOMOLOGY 2018; 111:1382-1387. [PMID: 29617902 DOI: 10.1093/jee/toy051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Indexed: 05/27/2023]
Abstract
Imidacloprid is a key insecticide used for controlling sucking insect pests, including the small brown planthopper (Laodelphax striatellus, Fallén) (Hemiptera: Delphacidae), an important agricultural pest of rice. A strain of L. striatellus (YN-ILR) developed 21-fold resistance when selected with imidacloprid on a susceptible YN strain. An in vitro study on piperonyl butoxide synergism indicated that enhanced detoxification mediated by cytochrome P450s contributed to imidacloprid resistance to some extent, and multiple P450 genes showed altered expression in the imidacloprid-resistant YN-ILR strain compared with the susceptible YN strain (CYP425B1-CYP6BD10 had 1.51- to 11.45-fold higher expression, CYP4CE2-CYP4DD1V2 had 0.12- to 0.57-fold lower expression). While there were no mutations in target nicotinic acetylcholine receptor (nAChR) genes, subunits of Lsα1, Lsβ1, and Lsβ3 in the YN-ILR strain showed 3.86-, 4.39-, and 2.59-fold higher expression and Lsa8 displayed 0.38-fold lower expression than the YN strain. Moreover, 21-fold moderate imidacloprid resistance in individuals of L. striatellus did not produce a fitness cost. The findings suggest that L. striatellus has the capacity to develop resistance to imidacloprid through P450 detoxification and potential target nAChR expression changes, and moderate imidacloprid resistance was not associated with a fitness cost.
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Affiliation(s)
- Yueliang Zhang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Baosheng Liu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Zhichun Zhang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Lihua Wang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Huifang Guo
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Zhong Li
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, China
| | - Peng He
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, China
| | - Zewen Liu
- Key Laboratory of Monitoring and Management of Plant Disease and Insects, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Jichao Fang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
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Zhang Y, Han Y, Yang Q, Wang L, He P, Liu Z, Li Z, Guo H, Fang J. Resistance to cycloxaprid in Laodelphax striatellus is associated with altered expression of nicotinic acetylcholine receptor subunits. PEST MANAGEMENT SCIENCE 2018; 74:837-843. [PMID: 28991400 DOI: 10.1002/ps.4757] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 09/23/2017] [Accepted: 10/04/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Cycloxaprid is a new oxabridged cis-configuration neonicotinoid insecticide, the resistance development potential and underlying resistance mechanism of which were investigated in the small brown planthopper, Laodelphax striatellus (Fallén), an important agricultural pest of rice. RESULTS A cycloxaprid-resistant strain (YN-CPD) only achieved 10-fold higher resistance, in contrast to 106-fold higher resistance to buprofezin and 332-fold higher resistance to chlorpyrifos achieved after exposure to similar selection pressure, and the cycloxaprid selected line showed no cross-resistance to the buprofezin and chlorpyrifos-selected resistance strains. Moreover, we identified 10 nicotinic acetylcholine receptor (nAChR) subunits from the transcriptome of L. striatellus, and six segments had open reading frames (ORFs). While we did not find mutations in the nAChR genes of L. striatellus, subunits Lsα1 and Lsβ1 exhibited, respectively, 9.60-fold and 3.36-fold higher expression in the resistant strain, while Lsα8 exhibited 0.44-fold lower expression. Suppression of Lsα1 through ingestion of dsLsα1 led to an increase in susceptibility to cycloxaprid. CONCLUSION The findings indicate that resistance to cycloxaprid develops slowly compared with resistance to other chemicals and without cross-resistance to chlorpyrifos or buprofezin; over-expressed Lsα1 is associated with low cycloxaprid resistance levels, but the importance of over-expressed Lsβ1 and reduced expression of Lsα8 could not be excluded. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Yueliang Zhang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Yangchun Han
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Qiong Yang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Lihua Wang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Peng He
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, China
| | - Zewen Liu
- Key Laboratory of Monitoring and Management of Plant Disease and Insects, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Zhong Li
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, China
| | - Huifang Guo
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
| | - Jichao Fang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Nanjing, China
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Yu N, Liu Y, Wang X, Li J, Bao H, Liu Z. Heterologous formation of neonicotinoid-sensitive nAChRs containing UNC-38 and UNC-29 subunits from Bursaphelenchus xylophilus. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2017; 143:168-172. [PMID: 29183588 DOI: 10.1016/j.pestbp.2017.08.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/31/2017] [Accepted: 08/04/2017] [Indexed: 06/07/2023]
Abstract
Nicotinic acetylcholine receptor (nAChR) subunits are encoded by a large multigene family and generate a large number of pentameric receptors with various properties. At present, nematode species, such as Caenorhabditis elegans, have the largest number of nAChR subunits. In this study, two nAChR subunits (Bxy-Unc-38 and Bxy-Unc-29) were cloned from Bursaphelenchus xylophilus, a fatal nematode pest on pine trees causing pine wilt disease. When Bxy-Unc-38 and Bxy-Unc-29 were co-expressed in Xenopus oocytes, constructed functional nAChRs showed agonist responses to acetylcholine and imidacloprid, a neonicotinoid insecticide. When complementary RNAs (cRNAs) of Bxy-Unc-38 and Bxy-Unc-29 were injected at different ratios, the assembled nAChRs showed different pharmacological subtypes, especially in terms of the sensitivity to imidacloprid and another two neonicotinoids. At cRNA ratios 1:1 and 1:5 (Bxy-Unc-38: Bxy-Unc-29), nAChRs showed low sensitivity to test neonicotinoids, which were partial agonists on the receptors. In contrast, at cRNA ratio 5:1, the three test neonicotinoids were full agonists and showed much higher potency compared to that on the receptors with cRNA ratio 1:1 and 1:5. For example, EC50 values of the three neonicotinoids on the receptors with cRNA ratio 1:5 were 170-222 times of those of receptors with cRNA ratio 5:1. The results showed that the subunit stoichiometry of Bxy-Unc-38/Bxy-Unc-29 receptor dramatically affected the agonist potency of neonicotinoids, and even altered the action property. Due to the high sensitivity of the constructed nAChRs at cRNA ratio 5:1, the construct would serve as an important model to study the interaction between invertebrate nAChRs and neonicotinoids.
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Affiliation(s)
- Na Yu
- 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
| | - Yang 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
| | - Xuan Wang
- 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
| | - Jian Li
- Changzhou Entry-Exit Inspection and Quarantine Bureau, No.1268, Longjin Road, Xinbei District, Changzhou, Jiangsu 213022, China
| | - Haibo Bao
- 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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Benzidane Y, Goven D, Abd-Ella AA, Deshayes C, Lapied B, Raymond V. Subchronic exposure to sublethal dose of imidacloprid changes electrophysiological properties and expression pattern of nicotinic acetylcholine receptor subtypes in insect neurosecretory cells. Neurotoxicology 2017; 62:239-247. [DOI: 10.1016/j.neuro.2017.08.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 07/21/2017] [Accepted: 08/05/2017] [Indexed: 10/19/2022]
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Chen X, Li F, Chen A, Ma K, Liang P, Liu Y, Song D, Gao X. Both point mutations and low expression levels of the nicotinic acetylcholine receptor β1 subunit are associated with imidacloprid resistance in an Aphis gossypii (Glover) population from a Bt cotton field in China. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2017; 141:1-8. [PMID: 28911734 DOI: 10.1016/j.pestbp.2016.11.004] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 10/25/2016] [Accepted: 11/14/2016] [Indexed: 05/27/2023]
Abstract
Aphis gossypii Glover is a destructive pest of numerous crops throughout the world. Although the expansion of Bt cotton cultivation has helped to control some insect pests, the damage from cotton aphids has not been mitigated. The evolution of aphid resistance to imidacloprid has made its chemical control more difficult since its introduction in 1991. Field populations of A. gossypii that were collected from different transgenic (Bt) cotton planting areas of China in 2014 developed different levels of resistance to imidacloprid. The IMI_R strain has developed high resistance to imidacloprid with the resistance ratio >1200-fold. Compared with the susceptible IMI_S strain, the IMI_R strain also developed a high level cross resistance to sulfoxaflor and acetamiprid. The limited synergism with either PBO or DEF suggests that resistance may be due to the site mutation of molecular target rather than to enhanced detoxification. Three target-site mutations within the nicotinic acetylcholine receptor (nAChR) β1 subunit were detected in the IMI_R strain. The R81T mutation has been reported to be responsible for imidacloprid resistance in A. gossypii and M. persicae. Both V62I and K264E were first detected in A. gossypii. These point mutations are also present in field populations, suggesting that they play a role in the resistance to imidacloprid. Furthermore, the expression level of transcripts encoding β1 subunit was decreased significantly in the IMI_R strain compared with the IMI_S strain, suggesting that both point mutations and the down-regulation of nAChR β1 subunit expression may be involved in the resistance mechanism for imidacloprid in A. gossypii. These results should be useful for the management of imidacloprid-resistant cotton aphids in Bt cotton fields in China.
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Affiliation(s)
- Xuewei Chen
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Fen Li
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Anqi Chen
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Kangsheng Ma
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Pingzhuo Liang
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Ying Liu
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Dunlun Song
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing 100193, China.
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Zhang Y, Yang B, Li J, Liu M, Liu Z. Point mutations in acetylcholinesterase 1 associated with chlorpyrifos resistance in the brown planthopper, Nilaparvata lugens Stål. INSECT MOLECULAR BIOLOGY 2017; 26:453-460. [PMID: 28407384 DOI: 10.1111/imb.12309] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Insecticide resistance frequently results from target-site insensitivity, such as point mutations in acetylcholinesterases (AChEs) for resistance to organophosphates and carbamates. From a field-originated population of Nilaparvata lugens, a major rice pest, a resistant population (R9) was obtained by nine-generation continuous selection with chlorpyrifos. From the same field population, a relatively susceptible population (S9) was also constructed through rearing without any insecticides. Compared to the susceptible strain, Sus [medium lethal dose (LC50 ) = 0.012 mg/l], R9 had a resistance ratio (RR) of 253.08-fold, whereas the RR of S9 was only 2.25-fold. Piperonyl butoxide and triphenyl phosphate synergized chlorpyrifos in R9 less than three-fold, indicating other important mechanisms for high resistance. The target-site insensitivity was supported by the key property differences of crude AChEs between R9 and S9. Compared to S9, three mutations (G119S, F331C and I332L) were detected in NlAChE1 from individuals of the R9 and field populations, but no mutation was detected in NlAChE2. G119S and F331C could decreased insecticide sensitivities in recombinant NlAChE1, whereas I332L took effect through increasing the influence of F331C on target insensitivity. F331C might be deleterious because of its influence on the catalytic efficiency of NlAChE1, whereas I332L would decrease these adverse effects and maintain the normal functions of AChEs.
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Affiliation(s)
- Y Zhang
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - B Yang
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
- Rice Technology Research and Development Center, China National Rice Research Institute, Hangzhou, China
| | - J Li
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - M Liu
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Z Liu
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), College of Plant Protection, Nanjing Agricultural University, Nanjing, China
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Wei X, Pan Y, Xin X, Zheng C, Gao X, Xi J, Shang Q. Cross-resistance pattern and basis of resistance in a thiamethoxam-resistant strain of Aphis gossypii Glover. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2017; 138:91-96. [PMID: 28456311 DOI: 10.1016/j.pestbp.2017.03.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 03/06/2017] [Accepted: 03/21/2017] [Indexed: 06/07/2023]
Abstract
A thiamethoxam-resistant strain of cotton aphid (ThR) displayed a 13.79-fold greater resistance to thiamethoxam than a susceptible cotton aphid (SS) strain. Piperonyl butoxide (PBO) and triphenyl phosphate (TPP) synergistically increased the toxicity of thiamethoxam in the resistant strain, whereas diethyl maleate (DEM) did not exhibit significant synergistic effects. Bioassay results indicated that the ThR strain developed increased levels of cross-resistance to bifenthrin (11.71 fold), cyfluthrin (17.90 fold), esfenvalerate (6.85 fold), clothianidin (6.56 fold), methidathion (5.34 fold) and alpha-cypermethrin (4.53 fold) but did not show cross-resistance to malathion, omethoate, acephate, chlorpyrifos, methomyl, sulfoxaflor or imidacloprid. PBO and TPP increased bifenthrin toxicity in the resistant strain by 2.38 and 4.55 fold, respectively. Quantitative real-time PCR results indicated that the mRNA expression levels of the α1, α4-1, α4-2, α5 and α7 subunits decreased significantly by 3.32, 1.60, 2.05, 5.41 and 1.48 fold, respectively, in the resistant strain compared with those in the susceptible strain. However, significant differences were not observed in the expression of the α2, α3 and β1 subunits. No target-site mutations within the α1, α2 and β1 subunits of nicotinic acetylcholine receptors (nAChRs) were detectable in the ThR strain. In conclusion, the levels of thiamethoxam resistance and cross-resistance to other insecticides observed in the ThR strain are likely regulated by two mechanisms, which include the overexpression of detoxification-related P450s and esterase. These results should be useful for the understanding thiamethoxam resistance mechanism and the management of insecticide-resistant cotton aphids in China.
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Affiliation(s)
- Xiang Wei
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Yiou Pan
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Xuecheng Xin
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Chao Zheng
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing 100193, PR China
| | - Jinghui Xi
- College of Plant Science, Jilin University, Changchun 130062, PR China
| | - Qingli Shang
- College of Plant Science, Jilin University, Changchun 130062, PR China.
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Sun H, Yang B, Zhang Y, Liu Z. Metabolic resistance in Nilaparvata lugens to etofenprox, a non-ester pyrethroid insecticide. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2017; 136:23-28. [PMID: 28187826 DOI: 10.1016/j.pestbp.2016.08.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 08/26/2016] [Accepted: 08/31/2016] [Indexed: 06/06/2023]
Abstract
Etofenprox, a non-ester pyrethroid insecticide, will be registered to control rice pests such as the brown planthopper (BPH, Nilaparvata lugens Stål) in mainland China. Insecticide resistance is always a problem to the effective control of N. lugens by chemical insecticides. An etofenprox resistance selection of N. lugens was performed in order to understand the related mechanisms. Through successive selection by etofenprox for 16 generations in the laboratory, an etofenprox-resistant strain (G16) with the resistance ratio (RR) of 422.3-fold was obtained. The resistance was partly synergised (2.68-fold) with the metabolic inhibitor PBO, suggesting a role for P450 monooxygenases. In this study, 11 P450 genes were significantly up-regulated in G16, among which eight genes was above 2.0-fold higher than that in US16, a population with the same origin of G16 but without contacting any insecticide in the laboratory. The expression level of four genes (CYP6AY1, CYP6FU1 and CYP408A1 from Clade 3, and CYP425A1 from Clade 4) were above 4.0-fold when compared to US16. RNA interference (RNAi) was performed to evaluate the importance of the selected P450s in etofenprox resistance. When CYP6FU1, CYP425A1 or CYP6AY1 was interfered, the susceptibility was significantly recovered in both G16 and US16, while the knockdown of CYP408A1 or CYP353D1 did not cause significant changes in etofenprox susceptibility. We supposed that CYP6FU1 was the most important P450 member for etofenprox resistance because of the highest expression level and the most noticeable effects on resistance ratios following RNAi.
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Affiliation(s)
- Huahua Sun
- 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
| | - Baojun Yang
- 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; Rice Technology Research and Development Center, China National Rice Research Institute, Hangzhou 310006, China
| | - Yixi 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
| | - 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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Vyas M, Raza A, Ali MY, Ashraf MA, Mansoor S, Shahid AA, Brown JK. Knock down of Whitefly Gut Gene Expression and Mortality by Orally Delivered Gut Gene-Specific dsRNAs. PLoS One 2017; 12:e0168921. [PMID: 28045942 PMCID: PMC5207534 DOI: 10.1371/journal.pone.0168921] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 12/08/2016] [Indexed: 01/07/2023] Open
Abstract
Control of the whitefly Bemisia tabaci (Genn.) agricultural pest and plant virus vector relies on the use of chemical insecticides. RNA-interference (RNAi) is a homology-dependent innate immune response in eukaryotes, including insects, which results in degradation of the corresponding transcript following its recognition by a double-stranded RNA (dsRNA) that shares 100% sequence homology. In this study, six whitefly 'gut' genes were selected from an in silico-annotated transcriptome library constructed from the whitefly alimentary canal or 'gut' of the B biotype of B. tabaci, and tested for knock down efficacy, post-ingestion of dsRNAs that share 100% sequence homology to each respective gene target. Candidate genes were: Acetylcholine receptor subunit α, Alpha glucosidase 1, Aquaporin 1, Heat shock protein 70, Trehalase1, and Trehalose transporter1. The efficacy of RNAi knock down was further tested in a gene-specific functional bioassay, and mortality was recorded in 24 hr intervals, six days, post-treatment. Based on qPCR analysis, all six genes tested showed significantly reduced gene expression. Moderate-to-high whitefly mortality was associated with the down-regulation of osmoregulation, sugar metabolism and sugar transport-associated genes, demonstrating that whitefly survivability was linked with RNAi results. Silenced Acetylcholine receptor subunit α and Heat shock protein 70 genes showed an initial low whitefly mortality, however, following insecticide or high temperature treatments, respectively, significantly increased knockdown efficacy and death was observed, indicating enhanced post-knockdown sensitivity perhaps related to systemic silencing. The oral delivery of gut-specific dsRNAs, when combined with qPCR analysis of gene expression and a corresponding gene-specific bioassay that relates knockdown and mortality, offers a viable approach for functional genomics analysis and the discovery of prospective dsRNA biopesticide targets. The approach can be applied to functional genomics analyses to facilitate, species-specific dsRNA-mediated control of other non-model hemipterans.
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Affiliation(s)
- Meenal Vyas
- School of Plant Sciences, University of Arizona, Tucson, Arizona, United States of America
| | - Amir Raza
- School of Plant Sciences, University of Arizona, Tucson, Arizona, United States of America
- National Institute for Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan
| | - Muhammad Yousaf Ali
- School of Plant Sciences, University of Arizona, Tucson, Arizona, United States of America
- National Institute for Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan
| | - Muhammad Aleem Ashraf
- Centre of Excellence in Molecular Biology (CEMB), University of Punjab, Lahore, Pakistan
| | - Shahid Mansoor
- National Institute for Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan
| | - Ahmad Ali Shahid
- Centre of Excellence in Molecular Biology (CEMB), University of Punjab, Lahore, Pakistan
| | - Judith K. Brown
- School of Plant Sciences, University of Arizona, Tucson, Arizona, United States of America
- * E-mail:
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Guo Y, Chai Y, Zhang L, Zhao Z, Gao LL, Ma R. Transcriptome Analysis and Identification of Major Detoxification Gene Families and Insecticide Targets in Grapholita Molesta (Busck) (Lepidoptera: Tortricidae). JOURNAL OF INSECT SCIENCE (ONLINE) 2017; 17:3075266. [PMID: 28365764 PMCID: PMC5469388 DOI: 10.1093/jisesa/iex014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Indexed: 05/12/2023]
Abstract
The oriental fruit moth, Grapholita molesta (Busck) (Lepidoptera: Tortricidae), is an important pest of most stone and pome fruits and causes serious damage to the fruit industry worldwide. This insect pest has been primarily controlled through the application of insecticides; as a result, G. molesta has developed resistance to many different types of insecticides. To identify detoxification genes, we have, de novo, sequenced the transcriptome of G. molesta (Lepidoptera: Tortricidae) and yielded 58,970 unigenes of which 26,985 unigenes matched to known proteins. In total, 2,040 simple sequence repeats have been identified. The comprehensive transcriptome data set has permitted us to identify members of important gene families related to detoxification in G. molesta, including 77 unigenes of putative cytochrome P450s, 28 of glutathione S-transferases, 46 of Carboxylesterases, and 31 of insecticide targets. Orthologs of some of these unigenes have shown to play a pivotal role in insecticide resistance in other insect species and those unigenes likely have similar functions in G. molesta.
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Affiliation(s)
- Yanqiong Guo
- College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China (; ; ; )
| | - Yanping Chai
- College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China (; ; ; )
| | - Lijun Zhang
- College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China (; ; ; )
| | - Zhiguo Zhao
- College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China (; ; ; )
| | - Ling-Ling Gao
- CSIRO Agriculture & Food, Private Bag 5, Wembley, WA 6913, Australia, and
| | - Ruiyan Ma
- College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China (; ; ; )
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Zhang Y, Yang Y, Sun H, Liu Z. Metabolic imidacloprid resistance in the brown planthopper, Nilaparvata lugens, relies on multiple P450 enzymes. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2016; 79:50-56. [PMID: 27793627 DOI: 10.1016/j.ibmb.2016.10.009] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 10/23/2016] [Accepted: 10/24/2016] [Indexed: 05/27/2023]
Abstract
Target insensitivity contributing to imidacloprid resistance in Nilaparvata lugens has been reported to occur either through point mutations or quantitative change in nicotinic acetylcholine receptors (nAChRs). However, the metabolic resistance, especially the enhanced detoxification by P450 enzymes, is the major mechanism in fields. From one field-originated N. lugens population, an imidacloprid resistant strain G25 and a susceptible counterpart S25 were obtained to analyze putative roles of P450s in imidacloprid resistance. Compared to S25, over-expression of twelve P450 genes was observed in G25, with ratios above 5.0-fold for CYP6AY1, CYP6ER1, CYP6CS1, CYP6CW1, CYP4CE1 and CYP425B1. RNAi against these genes in vivo and recombinant tests on the corresponding proteins in vitro revealed that four P450s, CYP6AY1, CYP6ER1, CYP4CE1 and CYP6CW1, played important roles in imidacloprid resistance. The importance of the four P450s was not equal at different stages of resistance development based on their over-expression levels, among which CYP6ER1 was important at all stages, and that the others might only contribute at certain stages. The results indicated that, to completely reflect roles of P450s in insecticide resistances, their over-expression in resistant individuals, expression changes at the stages of resistance development, and catalytic activities against insecticides should be considered. In this study, multiple P450s, CYP6AY1, CYP6ER1, CYP4CE1 and CYP6CW1, have proven to be important in imidacloprid resistance.
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Affiliation(s)
- Yixi 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
| | - Yuanxue Yang
- 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
| | - Huahua Sun
- 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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Abstract
Ion channels remain the primary target of most of the small molecule insecticides. This review examines how the subunit composition of heterologously expressed receptors determines their insecticide-specific pharmacology and how the pharmacology of expressed receptors differs from those found in the insect nervous system. We find that the insecticide-specific pharmacology of some receptors, like that containing subunits of the Rdl encoded GABA receptor, can be reconstituted with very few of the naturally occurring subunits expressed. In contrast, workers have struggled even to express functional insect nicotinic acetylcholine receptors (nAChRs), and work has therefore often relied upon the expression of vertebrate receptor subunits in their place. We also examine the extent to which insecticide-resistance-associated mutations, such as those in the para encoded voltage-gated sodium channel, can reveal details of insecticide-binding sites and mode of action. In particular, we examine whether mutations are present in the insecticide-binding site and/or at sites that allosterically affect the drug preferred conformation of the receptor. We also discuss the ryanodine receptor as a target for the recently developed diamides. Finally, we examine the lethality of the genes encoding these receptor subunits and discuss how this might determine the degree of conservation of the resistance-associated mutations found.
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Affiliation(s)
| | - Martin S Williamson
- b Biological Chemistry and Crop Protection, Rothamsted Research , Harpenden , Hertfordshire , UK
| | - T G Emyr Davies
- b Biological Chemistry and Crop Protection, Rothamsted Research , Harpenden , Hertfordshire , UK
| | - Chris Bass
- a Biosciences , University of Exeter in Cornwall , Falmouth , UK
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