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Yang QQ, Li SC, Cui YY, Huang ZH, Cheng LY, Zhang SH, Wu Z, Yu SJ, Pan Q, Ding LL, Lei S, Liu L, Cong L, Ran C. Identification and Functional Characterization of Carboxylesterase Genes Involved in Spirodiclofen Resistance in Panonychus citri (McGregor). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:17306-17316. [PMID: 39054269 DOI: 10.1021/acs.jafc.4c04094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
Overexpression of carboxyl/cholinesterase (CCE) genes has been reported to be associated with many cases of pesticide resistance in arthropods. However, it has been rarely documented that CCE genes participate in spirodiclofen resistance in Panonychus citri. In previous research, we found that spirodiclofen resistance is related to increased P450 and CCE enzyme activities in P. citri. In this study, we identified two CCE genes, PcCCE3 and PcCCE5, which were significantly upregulated in spirodiclofen-resistant strain and after exposure to spirodiclofen. RNA interference of PcCCE3 and PcCCE5 increased the spirodiclofen susceptibility in P. citri. In vitro metabolism indicated that PcCCE3 and PcCCE5 could interact with spirodiclofen, but metabolites were detected only in the PcCCE3 treatment. Our results indicated that PcCCE3 participates in spirodiclofen resistance through direct metabolism, and PcCCE5 may be involved in the spirodiclofen resistance by passive binding and sequestration, which provides new insights into spirodiclofen resistance in P. citri.
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Affiliation(s)
- Qi-Qi Yang
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Si-Chen Li
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Yang-Yang Cui
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Ze-Hao Huang
- College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China
| | - Lu-Yan Cheng
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
- Chongqing Institute for Food and Drug Control, Key Laboratory of Condiment Supervision Technology for State Market Regulation, Chongqing 401121, P. R. China
| | - Shao-Hui Zhang
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Zhen Wu
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Shi-Jiang Yu
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Qi Pan
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Li-Li Ding
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Shuang Lei
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Liu Liu
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Lin Cong
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
| | - Chun Ran
- Citrus Research Institute, Southwest University, National Citrus Engineering Research Center, Chongqing 400712, China
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Yang J, Zhang Y, Zhang Z, Ren M, Wang Y, Duan Y, Gao Y, Liu Z, Zhang P, Fan R, Zhou X. The development of an egg-soaking method for delivering dsRNAs into spider mites. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2024; 201:105905. [PMID: 38685227 DOI: 10.1016/j.pestbp.2024.105905] [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: 01/08/2024] [Revised: 04/08/2024] [Accepted: 04/08/2024] [Indexed: 05/02/2024]
Abstract
Recently, the first sprayable RNAi biopesticide, Ledprona, against the Colorado potato beetle, Leptinotarsa decemlineata, has been registered at the United States Environmental Protection Agency. Spider mites (Acari: Tetranychidae), a group of destructive agricultural and horticultural pests, are notorious for rapid development of insecticide/acaricide resistance. The management options, on the other hand, are extremely limited. RNAi-based biopesticides offer a promising control alternative to address this emerging issue. In this study, we i) developed an egg-soaking dsRNA delivery method; ii) evaluated the factors influencing RNAi efficiency, and finally iii) investigated the potential mode of entry of this newly developed egg-soaking RNAi method. In comparison to other dsRNA delivery methods, egg-soaking method was the most efficient, convenient/practical, and cost-effective method for delivering dsRNAs into spider mites. RNAi efficiency of this RNAi method was affected by target genes, dsRNA concentration, developmental stages, and mite species. In general, the hawthorn spider mite, Amphitetranychus viennensis, is more sensitive to RNAi than the two-spotted spider mite, Tetranychus urticae, and both of them have dose-dependent RNAi effect. For different life stages, egg and larvae are the most sensitive life stages to dsRNAs. For different target genes, there is no apparent association between the suppression level and the resultant phenotype. Finally, we demonstrated that this egg-soaking RNAi method acts as both stomach and contact toxicity. Our combined results demonstrate the effectiveness of a topically applied dsRNA delivery method, and the potential of a spray induced gene silencing (SIGS) method as a control alternative for spider mites.
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Affiliation(s)
- Jing Yang
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China.
| | - Yuying Zhang
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Zhonghuan Zhang
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Meifeng Ren
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Yifei Wang
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Yuanpeng Duan
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Yue Gao
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Zhongfang Liu
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Pengjiu Zhang
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Renjun Fan
- College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, Shanxi, China
| | - Xuguo Zhou
- Department of Entomology, School of Integrative Biology, College of Liberal Arts & Sciences, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA..
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Yang F, Ran L, He Y, Xu Z, He L, Zhang P. Enantioselective metabolism of fenpropathrin enantiomers by carboxyl/choline esterase 6 in Tetranychus cinnabarinus. PEST MANAGEMENT SCIENCE 2024; 80:1501-1509. [PMID: 37948435 DOI: 10.1002/ps.7882] [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: 11/07/2023] [Accepted: 11/08/2023] [Indexed: 11/12/2023]
Abstract
BACKGROUND Tetranychus cinnabarinus is a polyphagous pest mite commonly found in agriculture. As an excellent acaricide, fenpropathrin (FEN) is frequently used to control T. cinnabarinus in agriculture. However, commercial FEN is a racemate with two enantiomers, R-FEN and S-FEN. Considering that investigations on the metabolism of FEN by T. cinnabarinus are based on racemate FEN, it is important to investigate the enantioselective metabolism of FEN in T. cinnabarinus. RESULTS S-FEN was more toxic to T. cinnabarinus than R-FEN by more than 68.8-fold. Moreover, the synergist bioassay revealed that carboxylesterase and cytochrome P450 were the primary enzymes engaged in the detoxification of FEN in T. cinnabarinus, with carboxylesterase playing a leading role. Seven genes were substantially different after the induction of S-FEN and R-FEN. TcCCE06 was screened and selected as a key gene that related to FEN metabolism in T. cinnabarinus. The metabolic results showed that the recombinant TcCCE06 effectively metabolized 32.1% of the R-FEN and 13.8% of the S-FEN within 4 h of incubation. Moreover, R-FEN was demonstrated to have a higher affinity for the TcCCE06 protein than S-FEN based on molecular docking. CONCLUSION Our results indicated that TcCCE06 mediates the enantioselective metabolism of FEN in T. cinnabarinus. Our findings will contribute to a more comprehensive understanding of the mechanisms underlying the differential toxicity of the FEN enantiomers against T. cinnabarinus. Furthermore, they also provide a new perspective for the development of enantiomer-enriched acaricides with higher activity and lower pesticide dosage and pollution risks. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Furong Yang
- College of Plant Protection, Southwest University, Chongqing, China
| | - Lulu Ran
- College of Plant Protection, Southwest University, Chongqing, China
| | - Yuhan He
- College of Plant Protection, Southwest University, Chongqing, China
| | - Zhifeng Xu
- College of Plant Protection, Southwest University, Chongqing, China
| | - Lin He
- College of Plant Protection, Southwest University, Chongqing, China
| | - Ping Zhang
- College of Plant Protection, Southwest University, Chongqing, China
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Sembada AA, Fukuhara T, Suzuki T, Lenggoro IW. Stem cutting: A novel introduction site for transporting water-insoluble particles into tomato (Solanum lycopersicum) seedlings. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 206:108297. [PMID: 38154295 DOI: 10.1016/j.plaphy.2023.108297] [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: 05/13/2023] [Revised: 11/25/2023] [Accepted: 12/18/2023] [Indexed: 12/30/2023]
Abstract
The introduction of exogenous particles into plants has promising applications in agriculture and biotechnology. Nanoparticles can be transported into plants through foliar application or root uptake. However, both methods have limitations in terms of the size of the particles (<40 nm) that can be transported due to the barriers of the cell wall and cuticle. In the present study, we proposed a novel method to deliver particles of up to 110 nm into plants by cutting the stem of tomato seedlings. We demonstrated for the first time, using water-insoluble silica colloids, that not only nanoparticles but also submicron particles can be transported toward the leaves when the plant stem is used as the entry point of particles. Thirty-five-day-old tomato seedlings were used as the target plants. When the cut stem seedlings were immersed in the colloidal particle suspension for up to 24 h, significant particle accumulation was observed in the nodes and leaves. The relatively low particle concentrations (10 mg/L) allowed effective transport throughout the plants. Silica particles with average diameters of 10 nm and 110 nm were both well transported and moved through the stem. Even after the particles entered the plant, adventitious roots were formed, resulting in the formation of whole plants with roots, stems, and leaves. This method can be applied not only to tomatoes but also to other food crops for various applications in plant biotechnology.
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Affiliation(s)
- Anca Awal Sembada
- Chemical Engineering Program, Graduate School of Engineering, Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan; School of Life Sciences and Technology, Bandung Institute of Technology, Jalan Ganeca 10, Bandung, 40132, Indonesia
| | - Toshiyuki Fukuhara
- Department of Applied Biological Science, Graduate School of Agriculture, TUAT, 3-5-8 Saiwaicho, Fuchu, Tokyo, 183-8509, Japan
| | - Takeshi Suzuki
- Graduate School of Bio-Applications & Systems Engineering, TUAT, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - I Wuled Lenggoro
- Chemical Engineering Program, Graduate School of Engineering, Tokyo University of Agriculture and Technology (TUAT), 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan; Graduate School of Bio-Applications & Systems Engineering, TUAT, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan; Department of Applied Physics and Chemical Engineering, Graduate School of Engineering, TUAT, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan.
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Yang J, Zhang Y, Zhao J, Gao Y, Liu Z, Zhang P, Fan R, Xing S, Zhou X. Target gene selection for RNAi-based biopesticides against the hawthorn spider mite, Amphitetranychus viennensis (Acari: Tetranychidae). PEST MANAGEMENT SCIENCE 2023; 79:2482-2492. [PMID: 36866409 DOI: 10.1002/ps.7437] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/27/2023] [Accepted: 03/02/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Recently, RNA interference (RNAi)-based biopesticide, a species-specific pest control alternative, has been deregulated and commercialized in the US and Canada. The hawthorn spider mite, Amphitetranychus viennensis Zacher, is a major pest for rosaceous plants, which has been controlled primarily by synthetic pesticides. To address the emerging resistance issues in A. viennensis, we initiated a project to develop RNAi-based biopesticides. RESULTS In this study, we (i) developed a dietary RNAi system for A. viennensis using leaf disc, (ii) assessed the suitability of multiple control genes to distinguish sequence-specific silencing from non-specific effects within this RNAi system, and (iii) screened for the target gene candidates. As a result, β-Glucuronidase (GUS), an enzyme derived from E. coli and a broadly used reporter for plants is the appropriate control for A. viennensis RNAi, while green fluorescent protein (GFP), is not suitable due to its significantly higher mortality than the other controls. For target gene screening, suppression was confirmed for all the candidates, including two housekeeping genes (Vacuolar-type H + -ATPase subunit A (V-ATPase A) and Glyceraldehyde 3-phosphate dehydrogenase, (GAPDH)), and three genes associated with development (ATP-dependent RNA Helicase DDX3Y (Belle), CREB-binding protein (CBP), and Farnesoic acid O-methyltransferase (FaMet)). Knocking down of V-ATPase A resulted in the highest mortality (~ 90%) and reduced fecundity (over 90%) than other candidates. As for the genes associated with development, suppression of Belle and CBP, led to approximately 65% mortality, as well as 86% and 40% reduction in fecundity, respectively. Silencing of FaMet, however, had negligible biological impacts on A. viennensis. CONCLUSION The combined efforts not only establish an effective dsRNA delivery method, but also provide potential target genes for RNAi-based biopesticides against A. viennensis, a devastating invasive pest for fruit trees and woody ornamental plants throughout Asia and Europe. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Jing Yang
- College of Plant Protection, Shanxi Agricultural University/Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Yuying Zhang
- College of Plant Protection, Shanxi Agricultural University/Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Jin Zhao
- Research Institute of Applied Biology, Shanxi University, Taiyuan, China
| | - Yue Gao
- College of Plant Protection, Shanxi Agricultural University/Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Zhongfang Liu
- College of Plant Protection, Shanxi Agricultural University/Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Pengjiu Zhang
- College of Plant Protection, Shanxi Agricultural University/Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Renjun Fan
- College of Plant Protection, Shanxi Agricultural University/Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Shuping Xing
- Research Institute of Applied Biology, Shanxi University, Taiyuan, China
| | - Xuguo Zhou
- Department of Entomology, University of Kentucky, Lexington, KY, USA
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Xia X, Peng CW, Ye QT, Bing XL, Hong XY. Rop plays conserved roles in the reproductive and digestive processes of spider mites. INSECT SCIENCE 2023; 30:351-364. [PMID: 35980307 DOI: 10.1111/1744-7917.13103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/19/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Ras opposite (Rop) is known to play an essential role in regulating vesicle trafficking, including synaptic transmission and general secretion. The fundamental roles of Rop have been confirmed by the observation that null mutations in many organisms generate lethal phenotypes during embryogenesis. However, the effects of Rop during the postembryonic stages, especially in non-model organisms, remain largely unknown. Here, we provide new data that enhance our understanding of Rop's roles in the adults of multiple species of Tetranychus spider mites (Acari: Tetranychidae), a class of notorious agricultural pests. Our in silico and experimental evidence demonstrated that Rop is under purifying selection and is highly conserved in Tetranychus spp. RNA interference experiments showed that Rop is required for maintaining normal fecundity but has no significant effect on survival. We further demonstrate that knockdown of Rop darkens the body color of spider mites and blocks the excretion of fecal pellets, which is likely to be related to an abnormality in the excretion of food waste in the digestive system. Overall, our findings clarify novel functions of a vesicle trafficking-related gene in the adult stage of multiple Tetranychus species and highlight the need to evaluate the roles of essential genes in various organisms.
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Affiliation(s)
- Xue Xia
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Chang-Wu Peng
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Qing-Tong Ye
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Xiao-Li Bing
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Xiao-Yue Hong
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
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Cai Q, Wang Z, Yang F, Zhang B, Wang E, Lv J, Xu X. Expression and functional analysis of transformer-2 in Phytoseiulus persimilis and other genes potentially participating in reproductive regulation. EXPERIMENTAL & APPLIED ACAROLOGY 2023; 89:345-362. [PMID: 37027055 DOI: 10.1007/s10493-023-00786-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 03/14/2023] [Indexed: 05/09/2023]
Abstract
Transformer-2 (tra-2) is an important sex-determining gene in insects. It also plays a role in the reproduction of phytoseiid mites. We performed bioinformatic analyses for the tra-2 ortholog in Phytoseiulus persimilis (termed Pptra-2), measured its expression at different stages and quantitatively identified its function in reproduction. This gene encodes 288 amino acids with a conserved RRM domain. The peak of its expression was observed in adult females, especially ca. 5 days after mating. In addition, expression is also higher in eggs than in other stages and adult males. When Pptra-2 was silenced through RNA interference with oral delivery of dsRNA, 56% of the females had their egg hatching rates decreased in the first 5 days, from ca. 100% to ca. 20%, and maintained at low levels during the rest of the oviposition period. To detect other genes functionally related to Pptra-2, transcriptome analyses were performed on day 5 after mating. We compared mRNA expressions among interfered females with significantly reduced egg hatching rate, interfered females without significant hatching rate and CK. In total 403 differential genes were identified, of which 42 functional genes involved in the regulation of female reproduction and embryonic development were screened and discussed.
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Affiliation(s)
- Qi Cai
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zhenghui Wang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Fan Yang
- Beijing Hooseen Biotechnology Co., Ltd, Beijing, China
| | - Bo Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Endong Wang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jiale Lv
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China.
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
| | - Xuenong Xu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Beijing, China.
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
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Wu M, Zhang Q, Dong Y, Wang Z, Zhan W, Ke Z, Li S, He L, Ruf S, Bock R, Zhang J. Transplastomic tomatoes expressing double-stranded RNA against a conserved gene are efficiently protected from multiple spider mites. THE NEW PHYTOLOGIST 2023; 237:1363-1373. [PMID: 36328788 DOI: 10.1111/nph.18595] [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: 09/14/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Spider mites are serious pests and have evolved significant resistance to many chemical pesticides, thus making their control challenging. Several insect pests can be combated by plastid-mediated RNA interference (PM-RNAi), but whether PM-RNAi can be utilized to control noninsect pests is unknown. Here, we show that three species of spider mites (Tetranychus evansi, Tetranychus truncatus, and Tetranychus cinnabarinus) take up plastid RNA upon feeding. We generated transplastomic tomato plants expressing double-stranded RNA (dsRNA) targeted against a conserved region of the spider mite β-Actin mRNA. Transplastomic plants exhibited high levels of resistance to all three spider mite species, as evidenced by increased mortality and suppression of target gene expression. Notably, transplastomic plants induced a more robust RNAi response, caused higher mortality, and were overall better protected from spider mites than dsRNA-expressing nuclear transgenic plants. Our data demonstrate the potential of PM-RNAi as an efficient pest control measure for spider mites and extend the application range of the technology to noninsect pests.
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Affiliation(s)
- Mengting Wu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476, Potsdam-Golm, Germany
| | - Qi Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Yi Dong
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Zican Wang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Wenqin Zhan
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Zebin Ke
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Shengchun Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Lin He
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, 400715, China
| | - Stephanie Ruf
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476, Potsdam-Golm, Germany
| | - Ralph Bock
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476, Potsdam-Golm, Germany
| | - Jiang Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, School of Life Sciences, Hubei University, Wuhan, 430062, China
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Bing XL, Xia CB, Ye QT, Gong X, Cui JR, Peng CW, Hong XY. Wolbachia manipulates reproduction of spider mites by influencing herbivore salivary proteins. PEST MANAGEMENT SCIENCE 2023; 79:315-323. [PMID: 36151871 DOI: 10.1002/ps.7201] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/01/2022] [Accepted: 09/24/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND The endosymbiont Wolbachia is known for manipulating host reproduction. Wolbachia also can affect host fitness by mediating interactions between plant and herbivores. However, it remains unclear whether saliva proteins are involved in this process. RESULTS We found that Wolbachia infection decreased the number of deposited eggs but increased the egg hatching rate in the spider mite Tetranychus urticae Koch (Acari: Tetranychidae), a cosmopolitan pest that infects >1000 species of plants. Transcriptomic and proteomic analyses revealed that Wolbachia-infected mites upregulated the gene expression levels of many T. urticae salivary proteins including a cluster of Tetranychidae-specific, functionally uncharacterized SHOT1s (secreted host-responsive proteins of Tetranychidae). The SHOT1 genes were expressed more in the feeding stages (nymphs and adults) of mites than in eggs and highly enriched in the proterosomas. RNA interference experiments showed that knockdown of SHOT1s significantly decreased Wolbachia density, increased the number of deposited eggs and decreased the egg hatching rate. CONCLUSION Together, these results indicate that SHOT1s are positively correlated with Wolbachia density and account for Wolbachia-mediated phenotypes. Our results provide new evidence that herbivore salivary proteins are related to Wolbachia-mediated manipulations of host performance on plants. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Xiao-Li Bing
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Cai-Bei Xia
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Qing-Tong Ye
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Xue Gong
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Jia-Rong Cui
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Chang-Wu Peng
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Xiao-Yue Hong
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
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Wang Z, Li M, Kong Z, Wang E, Zhang B, Lv J, Xu X. Star Polycation Mediated dsRNA Improves the Efficiency of RNA Interference in Phytoseiulus persimilis. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12213809. [PMID: 36364584 PMCID: PMC9656875 DOI: 10.3390/nano12213809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/19/2022] [Accepted: 10/25/2022] [Indexed: 05/24/2023]
Abstract
RNA interference (RNAi) is one of the most widely used techniques to study gene functions. There is still a lack of RNAi techniques that can be applied in Phytoseiidae conveniently and efficiently. Star Polycation is a new nanomaterial commonly used as a carrier of dsRNA in RNAi. Five genes of P. persimilis (PpATPb, PpATPd, PpRpL11, PpRpS2, and Pptra-2) were selected to verify whether SPc promotes the delivery of dsRNA into P. persimilis through soaking. When each of the five genes were interfered using SPc-mediated dsRNA, the total number of success offspring produced per female in six days decreased by ca. 92%, 92%, 91%, 96%, and 64%. When PpATPb, PpATPd, PpRpL11, or PpRpS2 was interfered, both the fecundity and egg hatching rate decreased. In contrast, when Pptra-2 was interfered, reduction in the reproductive capability was mainly the result of the decreased egg hatching rate. Correspondingly, when the target gene was interfered, P. persimilis expression of PpRpL11 reduced by 63.95%, while that of the other four genes reduced by at least 80%. Our studies showed that nanomaterials, such as SPc, have the potential to be used in RNA interference of phytoseiid mites.
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Affiliation(s)
- Zhenhui Wang
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
| | - Mingxia Li
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
| | - Ziyi Kong
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
| | - Endong Wang
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
| | - Bo Zhang
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
| | - Jiale Lv
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
| | - Xuenong Xu
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences (IPPCAAS), No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China
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11
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Bensoussan N, Milojevic M, Bruinsma K, Dixit S, Pham S, Singh V, Zhurov V, Grbić M, Grbić V. Localized efficacy of environmental RNAi in Tetranychus urticae. Sci Rep 2022; 12:14791. [PMID: 36042376 PMCID: PMC9427735 DOI: 10.1038/s41598-022-19231-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 08/25/2022] [Indexed: 11/24/2022] Open
Abstract
Environmental RNAi has been developed as a tool for reverse genetics studies and is an emerging pest control strategy. The ability of environmental RNAi to efficiently down-regulate the expression of endogenous gene targets assumes efficient uptake of dsRNA and its processing. In addition, its efficiency can be augmented by the systemic spread of RNAi signals. Environmental RNAi is now a well-established tool for the manipulation of gene expression in the chelicerate acari, including the two-spotted spider mite, Tetranychus urticae. Here, we focused on eight single and ubiquitously-expressed genes encoding proteins with essential cellular functions. Application of dsRNAs that specifically target these genes led to whole mite body phenotypes—dark or spotless. These phenotypes were associated with a significant reduction of target gene expression, ranging from 20 to 50%, when assessed at the whole mite level. Histological analysis of mites treated with orally-delivered dsRNAs was used to investigate the spatial range of the effectiveness of environmental RNAi. Although macroscopic changes led to two groups of body phenotypes, silencing of target genes was associated with the distinct cellular phenotypes. We show that regardless of the target gene tested, cells that displayed histological changes were those that are in direct contact with the dsRNA-containing gut lumen, suggesting that the greatest efficiency of the orally-delivered dsRNAs is localized to gut tissues in T. urticae.
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Affiliation(s)
- Nicolas Bensoussan
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada.,Institut national de recherche pour l'agriculture, l'alimentation et l'environnement, 33882, Villenave d'Ornon, France
| | - Maja Milojevic
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada
| | - Kristie Bruinsma
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada
| | - Sameer Dixit
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada.,National Institute of Plant Genome Research, New Delhi, 110067, India
| | - Sean Pham
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada
| | - Vinayak Singh
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada
| | - Vladimir Zhurov
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada
| | - Miodrag Grbić
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada
| | - Vojislava Grbić
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada.
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12
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Qin S, Zhu B, Huang X, Hull JJ, Chen L, Luo J. Functional Role of AsAP in the Reproduction of Adelphocoris suturalis (Hemiptera: Miridae). INSECTS 2022; 13:755. [PMID: 36005380 PMCID: PMC9409435 DOI: 10.3390/insects13080755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Adelphocoris suturalis Jakovlev (Hemiptera: Miridae) is an omnivorous agricultural pest that has severe economic impacts on a diverse range of agricultural crops. Although the targeted disruption of reproductive development among insects has been proposed as a novel control strategy for pest species, the current understanding of the physiology and molecular mechanisms of A. suturalis reproduction is very limited. In this study, we isolated a putative A. suturalisaspartic protease (AsAP) gene that is highly expressed in the fat body and ovaries of sexually mature females. The double-stranded RNA (dsRNA)-mediated knockdown of AsAP suppressed ovarian development and negatively impacted female fertility, which suggested that it plays an essential role in A. suturalis reproduction. The results of this study could help to expand our understanding of A. suturalis reproductive development and have the potential to facilitate the development of effective strategies for the better control of this pest species.
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Affiliation(s)
- Shidong Qin
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Bangqin Zhu
- Guiyang Center for Disease Control and Prevention, Guiyang 550003, China
| | - Xingxing Huang
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - J. Joe Hull
- Pest Management and Biocontrol Research Unit, US Arid Land Agricultural Research Center, USDA Agricultural Research Services, Maricopa, AZ 85138, USA
| | - Lizhen Chen
- Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Jing Luo
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
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13
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Dixit S, Widemann E, Bensoussan N, Salehipourshirazi G, Bruinsma K, Milojevic M, Shukla A, Romero LC, Zhurov V, Bernards MA, Chruszcz M, Grbić M, Grbić V. β-Cyanoalanine synthase protects mites against Arabidopsis defenses. PLANT PHYSIOLOGY 2022; 189:1961-1975. [PMID: 35348790 PMCID: PMC9342966 DOI: 10.1093/plphys/kiac147] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 03/07/2022] [Indexed: 05/06/2023]
Abstract
Glucosinolates are antiherbivory chemical defense compounds in Arabidopsis (Arabidopsis thaliana). Specialist herbivores that feed on brassicaceous plants have evolved various mechanisms aimed at preventing the formation of toxic isothiocyanates. In contrast, generalist herbivores typically detoxify isothiocyanates through glutathione conjugation upon exposure. Here, we examined the response of an extreme generalist herbivore, the two-spotted spider mite Tetranychus urticae (Koch), to indole glucosinolates. Tetranychus urticae is a composite generalist whose individual populations have a restricted host range but have an ability to rapidly adapt to initially unfavorable plant hosts. Through comparative transcriptomic analysis of mite populations that have differential susceptibilities to Arabidopsis defenses, we identified β-cyanoalanine synthase of T. urticae (TuCAS), which encodes an enzyme with dual cysteine and β-cyanoalanine synthase activities. We combined Arabidopsis genetics, chemical complementation and mite reverse genetics to show that TuCAS is required for mite adaptation to Arabidopsis through its β-cyanoalanine synthase activity. Consistent with the β-cyanoalanine synthase role in detoxification of hydrogen cyanide (HCN), we discovered that upon mite herbivory, Arabidopsis plants release HCN. We further demonstrated that indole glucosinolates are sufficient for cyanide formation. Overall, our study uncovered Arabidopsis defenses that rely on indole glucosinolate-dependent cyanide for protection against mite herbivory. In response, Arabidopsis-adapted mites utilize the β-cyanoalanine synthase activity of TuCAS to counter cyanide toxicity, highlighting the mite's ability to activate resistant traits that enable this extreme polyphagous herbivore to exploit cyanogenic host plants.
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Affiliation(s)
| | | | - Nicolas Bensoussan
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | | | - Kristie Bruinsma
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Maja Milojevic
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Akanchha Shukla
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Luis C Romero
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, E-41092 Seville, Spain
| | - Vladimir Zhurov
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Mark A Bernards
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Maksymilian Chruszcz
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, 29208, USA
| | - Miodrag Grbić
- Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7
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14
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Wise JC, Wise AG, Rakotondravelo M, Vandervoort C, Seeve C, Fabbri B. Trunk injection delivery of dsRNA for RNAi-based pest control in apple trees. PEST MANAGEMENT SCIENCE 2022; 78:3528-3533. [PMID: 35578562 PMCID: PMC9541757 DOI: 10.1002/ps.6993] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 05/13/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND RNA interference (RNAi) is a promising new approach for controlling insect pests without the use of synthetic pesticides. Trunk injection is a delivery system for woody plants that harnesses the vascular system of the tree to transport materials to the tree canopy. Full size apple trees were injected with double-stranded RNA (dsRNA), and season-long leaf samples were taken to measure the vascular mobility and temporal persistence of dsRNA, using quantitative reverse transcription polymerase chain reaction (qRT-PCR). RESULTS The qRT-PCR results revealed that the quantities of dsRNA in the apple leaves of treated trees were significantly greater than those in the leaves of untreated trees for both 2019 and 2020 studies. The peak dsRNA concentration in 2019 was 242 pg/30 mg of leaf tissue, and in 2020 was 16.4 pg/30 mg. The persistence of dsRNA in the apple tree canopy in 2019 was at least 84 days, and in 2020 was at least 141 days. CONCLUSIONS The highest mean measurement of dsRNA on a single date in 2019 was 242 pg, which is approximately equivalent to 8 ng/1 g leaf tissue. The projection using the highest replicate concentration from the same date is approximately equivalent to 27 ng/1 g leaf tissue, which may be sufficient to be considered biologically active. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- John C Wise
- Department of EntomologyMichigan State UniversityEast LansingMIUSA
| | - Annabel G Wise
- Veterinary Diagnostic LaboratoryMichigan State UniversityEast LansingMIUSA
| | | | - Christine Vandervoort
- Department of Plant, Soil and Microbial SciencesMichigan State UniversityEast LansingMIUSA
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15
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Takeda M, Suzuki T. Circadian and Neuroendocrine Basis of Photoperiodism Controlling Diapause in Insects and Mites: A Review. Front Physiol 2022; 13:867621. [PMID: 35812309 PMCID: PMC9257128 DOI: 10.3389/fphys.2022.867621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 05/02/2022] [Indexed: 11/13/2022] Open
Abstract
The photoperiodic system is concealed in the highly complex black-box, comprising four functional subunits: 1) a photo/thermo-sensitive input unit, 2) a photoperiodic clock based on a circadian system, 3) a condenser unit counting the number of inductive signals, and 4) a neuroendocrine switch that triggers a phenotypic shift. This review aims to summarize the research history and current reach of our understanding on this subject to connect it with the molecular mechanism of the circadian clock rapidly being unveiled. The review also focuses on the mode of intersubunit information transduction. It will scan the recent advancement in research on each functional subunit, but special attention will be given to the circadian clock–endocrine conjunct and the role of melatonin signaling in the regulation of insect photoperiodism. Prothoracicotropic hormone (PTTH) probably plays the most crucial role in the regulation of pupal diapause, which is the simplest model system of diapause regulation by hormones investigated so far, particularly in the Chinese oak silkmoth (Antheraea pernyi). A search for the trigger to release the PTTH found some candidates, that is, indoleamines. Indolamine metabolism is controlled by arylalkylamine N-acetyltransferase (aaNAT). Indolamine dynamics and aaNAT enzymatic activity changed according to photoperiods. aaNAT activity and melatonin content in the brain showed not only a photoperiodic response but also a circadian fluctuation. aaNAT had multiple E-boxes, suggesting that it is a clock-controlled gene (ccg), which implies that cycle (cyc, or brain–muscle Arnt-like 1 = Bmal1)/Clock (Clk) heterodimer binds to E-box and stimulates the transcription of aaNAT, which causes the synthesis of melatonin. RNAi against transcription modulators, cyc, or Clk downregulated aaNAT transcription, while RNAi against repressor of cyc/Clk, per upregulated aaNAT transcription. Immunohistochemical localization showed that the circadian neurons carry epitopes of melatonin-producing elements such as aaNAT, the precursor serotonin, HIOMT, and melatonin as well as clock gene products such as cyc-ir, Per-ir, and dbt-ir, while PTTH-producing neurons juxtaposed against the clock neurons showed hMT2-ir in A. pernyi brain. Melatonin probably binds to the putative melatonin receptor (MT) that stimulates Ca2+ influx, which in turn activates PKC. This induces Rab 8 phosphorylation and exocytosis of PTTH, leading to termination of diapause. All the PTTH-expressing neurons have PKC-ir, and Rab8-ir. When diapause is induced and maintained under short days, serotonin binding to 5HTR1B suppresses PTTH release in a yet unknown way. RNAi against this receptor knocked out photoperiodism; short day response is blocked and diapause was terminated even under the short day condition. The result showed that a relatively simple system controls both induction and termination in pupal diapause of A. pernyi: the circadian system regulates the transcription of aaNAT as a binary switch, the enzyme produces a melatonin rhythm that gates PTTH release, and 5HTR1B and MT are probably also under photoperiodic regulation. Finally, we listed the remaining riddles which need to be resolved, to fully understand this highly complex system in future studies.
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Affiliation(s)
- Makio Takeda
- Graduate School of Agricultural Science, Kobe University, Kobe, Japan
- *Correspondence: Makio Takeda,
| | - Takeshi Suzuki
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
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16
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Li X, Liu R, Li G, Jin D, Guo J, Ochoa R, Yi T. Identification of the fibroin of Stigmaeopsis nanjingensis by a nanocarrier-based transdermal dsRNA delivery system. EXPERIMENTAL & APPLIED ACAROLOGY 2022; 87:31-47. [PMID: 35543822 PMCID: PMC9287230 DOI: 10.1007/s10493-022-00718-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 04/19/2022] [Indexed: 06/15/2023]
Abstract
Stigmaeopsis nanjingensis (Ma and Yuan) (Acari: Tetranychidae) is an important pest of bamboo-feeding behavior and silk production by the female adult mites is seriously harmful to bamboo leaves. Due to its small size, silking and cocooning, its management is difficult. This study discusses a fast and easy method for management of the pest by disturbing the spinning behavior. Stigmaeopsis nanjingensis is host specific and feeds only on bamboo leaves. Leaf margins of bamboo are highly hydrophobic, which makes dsRNA difficult to immerse. Hence, it is a challenge to apply the commonly used feeding method to inhibit gene expression in mites. In this study, we deliver dsRNA to interfere with the expression of fibroin by body wall permeation with a nanocarrier-based delivery system. The dsRNA/nanocarrier formulation droplets could enter the body cavity within 2 min after falling on the mite. The fibroin silencing efficiency was 75.4%, and the results of electron microscopy showed that dsRNA/nanocarrier damage the morphological structure of the silk thread. This study demonstrated the effectiveness of a nanocarrier-based percutaneous dsRNA delivery system in S. nanjingensis and its effect on the fibroin gene that influences the spinning behavior of S. nanjingensis. These findings may provide a new delivery system for RNAi-based control of spider mites that utilize protective webbing in the field.
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Affiliation(s)
- Xia Li
- Institute of Entomology, Guizhou University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang, 550025, China
- Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agricultural and Rural Affairs, Guiyang, 550025, China
| | - Rundong Liu
- Institute of Entomology, Guizhou University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang, 550025, China
- Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agricultural and Rural Affairs, Guiyang, 550025, China
| | - Gang Li
- Institute of Entomology, Guizhou University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang, 550025, China
- Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agricultural and Rural Affairs, Guiyang, 550025, China
| | - Daochao Jin
- Institute of Entomology, Guizhou University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang, 550025, China
- Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agricultural and Rural Affairs, Guiyang, 550025, China
| | - Jianjun Guo
- Institute of Entomology, Guizhou University, Guiyang, 550025, China
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang, 550025, China
- Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agricultural and Rural Affairs, Guiyang, 550025, China
| | - Ronald Ochoa
- Systematic Entomology Laboratory (SEL), Agricultural Research Service (ARS), Beltsville Agricultural Research Centre (BARC), United States Department of Agriculture (USDA), Maryland, 20705, USA
| | - Tianci Yi
- Institute of Entomology, Guizhou University, Guiyang, 550025, China.
- Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang, 550025, China.
- Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agricultural and Rural Affairs, Guiyang, 550025, China.
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17
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Papapostolou KM, Riga M, Samantsidis GR, Skoufa E, Balabanidou V, Van Leeuwen T, Vontas J. Over-expression in cis of the midgut P450 CYP392A16 contributes to abamectin resistance in Tetranychus urticae. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2022; 142:103709. [PMID: 34995778 DOI: 10.1016/j.ibmb.2021.103709] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/22/2021] [Accepted: 12/28/2021] [Indexed: 06/14/2023]
Abstract
Cytochrome P450 mediated metabolism is a well-known mechanism of insecticide resistance. However, to what extent qualitative or quantitative changes are responsible for increased metabolism, is not well understood. Increased expression of P450 genes is most often reported, but the underlying regulatory mechanisms remain widely unclear. In this study, we investigate CYP392A16, a P450 from the polyphagous and major agricultural pest Tetranychus urticae. High expression levels of CYP392A16 and in vitro metabolism assays have previously associated this P450 with abamectin resistance. Here, we show that CYP392A16 is primarily localized in the midgut epithelial cells, as indicated by immunofluorescence analysis, a finding also supported by a comparison between feeding and contact toxicity bioassays. Silencing via RNAi of CYP392A16 in a highly resistant T. urticae population reduced insecticide resistance levels from 3400- to 1900- fold, compared to the susceptible reference strain. Marker-assisted backcrossing, using a single nucleotide polymorphism (SNP) found in the CYP392A16 allele from the resistant population, was subsequently performed to create congenic lines bearing this gene in a susceptible genetic background. Toxicity assays indicated that the allele derived from the resistant strain confers 3.6-fold abamectin resistance compared to the lines with susceptible genetic background. CYP392A16 is over-expressed at the same levels in these lines, pointing to cis-regulation of gene expression. In support of that, functional analysis of the putative promoter region from the resistant and susceptible parental strains revealed a higher reporter gene expression, confirming the presence of cis-acting regulatory mechanisms.
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Affiliation(s)
- Kyriaki Maria Papapostolou
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, GR-700 13, Heraklion, Crete, Greece; Department of Biology, University of Crete, Vassilika Vouton, 70013, Heraklion, Greece
| | - Maria Riga
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, GR-700 13, Heraklion, Crete, Greece; Department of Biology, University of Crete, Vassilika Vouton, 70013, Heraklion, Greece.
| | - George-Rafael Samantsidis
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, GR-700 13, Heraklion, Crete, Greece; Department of Biology, University of Crete, Vassilika Vouton, 70013, Heraklion, Greece
| | - Evangelia Skoufa
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, GR-700 13, Heraklion, Crete, Greece; Department of Biology, University of Crete, Vassilika Vouton, 70013, Heraklion, Greece
| | - Vasileia Balabanidou
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, GR-700 13, Heraklion, Crete, Greece
| | - Thomas Van Leeuwen
- Department of Plants and Crops, Faculty of Bioscience Engineering, Coupure Links 653, Ghent University, B-9000, Ghent, Belgium
| | - John Vontas
- Institute of Molecular Biology & Biotechnology, Foundation for Research & Technology Hellas, 100 N. Plastira Street, GR-700 13, Heraklion, Crete, Greece; Department of Crop Science, Agricultural University of Athens, 75 Iera Odos Street, GR-11855, Athens, Greece.
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18
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Zhenhui W, Qi C, Shuo Y, Shuoyu Y, Qin L, Endong W, Bo Z, Jiale L, Xuenong X. Molecular characterization, expression, and function of Vitellogenin genes in Phytoseiulus persimilis. EXPERIMENTAL & APPLIED ACAROLOGY 2022; 86:343-356. [PMID: 35239074 DOI: 10.1007/s10493-022-00698-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 02/05/2022] [Indexed: 06/14/2023]
Abstract
Vitellogenin (Vg) is an important factor that impacts oocyte maturation, egg formation and embryonic development in Arthropoda. Two orthologs of Vg gene were obtained from the genome of Phytoseiulus persimilis and termed as PpVg1 and PpVg2. Both orthologs belong to the large lipid transfer protein superfamily. The expression of PpVg1 and PpVg2 was low in immatures and male adults, and increased rapidly in female adults after mating, and reached a peak before the first egg was laid (168× and 20.5× the level in virgin females, respectively). When PpVg1 and PpVg2 were interfered with dsRNA, the relative expression decreased by 81.0 and 30.9%, respectively, and 7.8 and 31.4% interfered individuals died within 24 h. Among surviving individuals, ca. 51.1 and 44.8% are infertile. Factors that might be related to expression of Vg genes are also discussed.
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Affiliation(s)
- Wang Zhenhui
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Cai Qi
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yan Shuo
- Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China
| | - Yang Shuoyu
- Beijing Hooseen Biotechnology Co., Ltd, Beijing, China
| | - Lu Qin
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Wang Endong
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zhang Bo
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lv Jiale
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
| | - Xu Xuenong
- Lab of Predatory Mites, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
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Fernando DD, Korhonen PK, Gasser RB, Fischer K. An RNA Interference Tool to Silence Genes in Sarcoptes scabiei Eggs. Int J Mol Sci 2022; 23:ijms23020873. [PMID: 35055058 PMCID: PMC8777771 DOI: 10.3390/ijms23020873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 01/05/2022] [Accepted: 01/11/2022] [Indexed: 12/10/2022] Open
Abstract
In a quest for new interventions against scabies-a highly significant skin disease of mammals, caused by a parasitic mite Sarcoptes scabiei-we are focusing on finding new intervention targets. RNA interference (RNAi) could be an efficient functional genomics approach to identify such targets. The RNAi pathway is present in S. scabiei and operational in the female adult mite, but other developmental stages have not been assessed. Identifying potential intervention targets in the egg stage is particularly important because current treatments do not kill this latter stage. Here, we established an RNAi tool to silence single-copy genes in S. scabiei eggs. Using sodium hypochlorite pre-treatment, we succeeded in rendering the eggshell permeable to dsRNA without affecting larval hatching. We optimised the treatment of eggs with gene-specific dsRNAs to three single-copy target genes (designated Ss-Cof, Ss-Ddp, and Ss-Nan) which significantly and repeatedly suppressed transcription by ~66.6%, 74.3%, and 84.1%, respectively. Although no phenotypic alterations were detected in dsRNA-treated eggs for Ss-Cof and Ss-Nan, the silencing of Ss-Ddp resulted in a 38% reduction of larval hatching. This RNAi method is expected to provide a useful tool for larger-scale functional genomic investigations for the identification of essential genes as potential drug targets.
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Affiliation(s)
- Deepani D. Fernando
- Infectious Diseases Program, Cell and Molecular Biology Department, QIMR Berghofer Medical Research Institute, Brisbane, QLD 4006, Australia;
| | - Pasi K. Korhonen
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, VIC 3052, Australia; (P.K.K.); (R.B.G.)
| | - Robin B. Gasser
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, VIC 3052, Australia; (P.K.K.); (R.B.G.)
| | - Katja Fischer
- Infectious Diseases Program, Cell and Molecular Biology Department, QIMR Berghofer Medical Research Institute, Brisbane, QLD 4006, Australia;
- Correspondence:
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Double-Strand RNA (dsRNA) Delivery Methods in Insects: Diaphorina citri. Methods Mol Biol 2022; 2360:253-277. [PMID: 34495520 PMCID: PMC8959005 DOI: 10.1007/978-1-0716-1633-8_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
RNAi is a gene-silencing mechanism conserved in the vast majority of eukaryotes. It is widely used to study gene function in animals due to the ease of eliciting gene knockdown. Beyond research applications, RNAi technology based on exogenous dsRNA is a promising candidate for next generation insect pest control. An advantage of using RNAi is that design of dsRNA essentially requires only the sequence of the target gene. The greatest challenge, however, is dsRNA delivery for large-scale insect control. Delivery methods that have widely been used are oral, injection, or via soaking. Unfortunately, each insect presents its own challenges owing to the differences in the presence of dsRNA degrading enzymes, cellular uptake efficiency, expression of core RNAi machinery, the nature of the target gene, the concentration and persistence of the dsRNA, as well as the particular way of feeding of each insect, which together cause variations in the efficiency of RNAi. In this chapter, a protocol for the synthetic production of dsRNA is described along with three methods for delivery that have been successful in one of the more problematic insects, Diaphorina citri.
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21
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Ghazy NA, Suzuki T. Environmental RNAi-based reverse genetics in the predatory mite Neoseiulus californicus: Towards improved methods of biological control. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2022; 180:104993. [PMID: 34955179 DOI: 10.1016/j.pestbp.2021.104993] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 10/31/2021] [Accepted: 11/15/2021] [Indexed: 06/14/2023]
Abstract
The predatory mite Neoseiulus californicus (McGregor) (Mesostigmata: Phytoseiidae) has been commercialized by manufacturers in the pest control industry and is used worldwide as a natural enemy of spider mites. However, because its genome has not been sequenced, reverse genetics techniques that could be used to analyze gene function have not been established. Here we partially sequenced the gene that encodes the vacuolar-type H+-ATPase (V-ATPase), an ATP-dependent proton pump, in N. californicus (NcVATPase) and then conducted a functional analysis using environmental RNA interference (eRNAi) by orally administering sequence-specific exogenous dsRNA (dsRNA-NcVATPase) to larvae and adult females. The larvae treated with dsRNA-NcVATPase took longer to develop and had lower survivorship, fecundity, and offspring viability at the adult stage than those treated with a control dsRNA. Adult females treated with dsRNA-NcVATPase showed significant reductions in survival, fecundity, and prey consumption, and their endogenous gene expression level of NcVATPase was reduced by approximately 65% compared with the control. Our findings suggest that the NcVATPase gene, silencing of which inhibits feeding and reproduction, is an excellent biomarker for investigating the eRNAi mechanism in N. californicus. The highly efficient experimental system of eRNAi established in this study paves the way for applied research using eRNAi to enhance the predatory ability of N. californicus.
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Affiliation(s)
- Noureldin Abuelfadl Ghazy
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan; Agriculture Zoology Department, Faculty of Agriculture, Mansoura University, 35516 El-Mansoura, Egypt; Japan Society for the Promotion of Science, Chiyoda, Tokyo 102-0083, Japan.
| | - Takeshi Suzuki
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan; Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8538, Japan.
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22
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Salehipourshirazi G, Bruinsma K, Ratlamwala H, Dixit S, Arbona V, Widemann E, Milojevic M, Jin P, Bensoussan N, Gómez-Cadenas A, Zhurov V, Grbic M, Grbic V. Rapid specialization of counter defenses enables two-spotted spider mite to adapt to novel plant hosts. PLANT PHYSIOLOGY 2021; 187:2608-2622. [PMID: 34618096 PMCID: PMC8644343 DOI: 10.1093/plphys/kiab412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 08/05/2021] [Indexed: 05/06/2023]
Abstract
Genetic adaptation, occurring over a long evolutionary time, enables host-specialized herbivores to develop novel resistance traits and to efficiently counteract the defenses of a narrow range of host plants. In contrast, physiological acclimation, leading to the suppression and/or detoxification of host defenses, is hypothesized to enable broad generalists to shift between plant hosts. However, the host adaptation mechanisms used by generalists composed of host-adapted populations are not known. Two-spotted spider mite (TSSM; Tetranychus urticae) is an extreme generalist herbivore whose individual populations perform well only on a subset of potential hosts. We combined experimental evolution, Arabidopsis thaliana genetics, mite reverse genetics, and pharmacological approaches to examine mite host adaptation upon the shift of a bean (Phaseolus vulgaris)-adapted population to Arabidopsis. We showed that cytochrome P450 monooxygenases are required for mite adaptation to Arabidopsis. We identified activities of two tiers of P450s: general xenobiotic-responsive P450s that have a limited contribution to mite adaptation to Arabidopsis and adaptation-associated P450s that efficiently counteract Arabidopsis defenses. In approximately 25 generations of mite selection on Arabidopsis plants, mites evolved highly efficient detoxification-based adaptation, characteristic of specialist herbivores. This demonstrates that specialization to plant resistance traits can occur within the ecological timescale, enabling the TSSM to shift to novel plant hosts.
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Affiliation(s)
| | - Kristie Bruinsma
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Huzefa Ratlamwala
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Sameer Dixit
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Vicent Arbona
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Castelló de la Plana, E-12071, Spain
| | - Emilie Widemann
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Maja Milojevic
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Pengyu Jin
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Nicolas Bensoussan
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Aurelio Gómez-Cadenas
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Castelló de la Plana, E-12071, Spain
| | - Vladimir Zhurov
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
| | - Miodrag Grbic
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
- Instituto de Ciencias de la Vid y el Vino (CSIC, UR, Gobiernode La Rioja), Logrono 26006, Spain
- Department of Biology, University of Belgrade, Belgrade, Serbia
| | - Vojislava Grbic
- Department of Biology, The University of Western Ontario, London, Ontario N6A 5B8, Canada
- Author for communication:
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Huo SM, Zhang YY, Song ZR, Xiong XH, Hong XY. The potential pigmentation-related genes in spider mites revealed by comparative transcriptomes of the red form of Tetranychus urticae. INSECT MOLECULAR BIOLOGY 2021; 30:580-593. [PMID: 34309936 DOI: 10.1111/imb.12727] [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: 03/23/2021] [Revised: 05/27/2021] [Accepted: 07/22/2021] [Indexed: 06/13/2023]
Abstract
Colouration in spider mites is due to the presence of carotenoids with diverse colours, including yellows, oranges and reds. Tetranychus urticae has two main colour forms, red and green. Although a ketolase has been implicated in determining the colour, the underlying genetic basis of body colour divergence between the two forms has remained unclear. Based on a combination of comparative transcriptomes and RNA interference, we found that a gene encoding a cytochrome P450 enzyme of the CYP4 clan (CYP389B1) had remarkably high expression in adult females of the red T. urticae, as well as in hybrids obtained by crossing the red and green forms. Down-regulation of this gene by RNA interference resulted in decreased accumulation of red pigment. Up-regulation of the expressions of a scavenger receptor gene (SCARB1) and a mitochondrial glycine transporter (SLC25A38) also strongly contributed to red colour development in adult females. Suppressing the mRNA levels of these genes also resulted in reduced accumulation of red pigment in the three other spider mites with red body colour. Our results provide evidence that the body colour divergence between the two forms is caused by different expressions of pigmentation-related genes, and point to a possible role of a novel cytochrome P450 gene (CYP389B1) in regulating red-orange body colour. These findings expand the number of candidate cytochrome P450 genes involved in endogenous pigmentation and will help to understand their roles in determining colour patterns in mites and other species.
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Affiliation(s)
- S-M Huo
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Y-Y Zhang
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - Z-R Song
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - X-H Xiong
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - X-Y Hong
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
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24
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Wei P, Wang C, Li C, Chen M, Sun J, Van Leeuwen T, He L. Comparing the efficiency of RNAi after feeding and injection of dsRNA in spider mites. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2021; 179:104966. [PMID: 34802516 DOI: 10.1016/j.pestbp.2021.104966] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 09/14/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Pesticide resistance in spider mites drives the development of acaricides with novel mode of action, which could benefit from RNAi as a screening tool in search of new molecular targets. RNAi via oral delivery of dsRNA has been frequently reported in spider mites, but injection of dsRNA is rarely reported. We compare here the efficiency of oral delivery versus injection of dsRNA in female adult mites. When comparing silencing efficiency, oral delivery of dsRNAs silenced 40.6 ± 8.9% of CPR, 63.8 ± 6.9% of CHMP2A, and 37.7 ± 5.7% of CHMP3 genes. Similar silencing efficiencies were found for injection (48.6 ± 3.7% of CPR, 70.2 ± 4.1% of CHMP2A, 59.8 ± 2.2% of CHMP3), but with much lower quantities of dsRNAs. Oral delivery of dsRNA failed to silence the expression of the CHMP4B gene, but this could be accomplished by injection of dsRNA (23.1 ± 1.0%). When scoring the phenotypic effects of silencing, both oral delivery and injection of CHMP2A- and CHMP3-dsRNA influenced the locomotion speed of mites significantly. For CPR, silencing could only be accomplished by dsRNA injection, not by feeding. CPR silencing significantly impacted the toxicity of a typical acaricide, pyridaben, as the susceptibility of mites raised 2.75-fold. Last, injection of Eya-dsRNA in adults produced transgenerational phenotypic effects on 3.59% of offspring, as quantified by an observed deviation in eye development, while oral delivery of Eya-dsRNA did not. In conclusion, injection of dsRNA is superior to oral delivery in silencing the expression of the selected genes in this study and could be considered the method of choice to study gene function in reverse genetic approaches.
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Affiliation(s)
- Peng Wei
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China; Academy of Agricultural Sciences, Southwest University, Chongqing, China; State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Southwest University, Chongqing, China
| | - Chao Wang
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China; Academy of Agricultural Sciences, Southwest University, Chongqing, China; State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Southwest University, Chongqing, China
| | - Chunji Li
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China; Academy of Agricultural Sciences, Southwest University, Chongqing, China; State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Southwest University, Chongqing, China
| | - Ming Chen
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China; Academy of Agricultural Sciences, Southwest University, Chongqing, China; State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Southwest University, Chongqing, China
| | - Jingyu Sun
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China; Academy of Agricultural Sciences, Southwest University, Chongqing, China; State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Southwest University, Chongqing, China
| | - Thomas Van Leeuwen
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Lin He
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China; Academy of Agricultural Sciences, Southwest University, Chongqing, China; State Cultivation Base of Crop Stress Biology for Southern Mountainous Land of Southwest University, Southwest University, Chongqing, China.
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25
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Garbatti Factor B, de Moura Manoel Bento F, Figueira A. Methods for Delivery of dsRNAs for Agricultural Pest Control: The Case of Lepidopteran Pests. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2021; 2360:317-345. [PMID: 34495524 DOI: 10.1007/978-1-0716-1633-8_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
RNA interference (RNAi) is a natural mechanism of gene regulation, highly conserved in eukaryotes. Since the elucidation of the gene silencing mechanism, RNAi became an important tool used in insect reverse genetics. The demonstration of effective target-gene silencing by ingestion of double-stranded RNA (dsRNA) produced by transgenic plants indicated the RNAi potential to be used in insect pest management, particularly in agriculture. However, the efficiency of gene silencing by RNAi in insects may vary according to the target taxa, and lepidopteran species have been shown to be quite recalcitrant to RNAi. Developing transgenic plants is a time-consuming and labor-intensive process, so alternative oral delivery systems are required to develop and optimize RNAi settings, such as selecting an efficient target gene, and dsRNA design, length, and stability, among other features. We have developed delivery systems to evaluate dsRNAs to silence genes from two important lepidopteran crop pests of tomato (Solanum lycopersicum) and sugarcane (Saccharum × officinarum): Tuta absoluta (Meyrick), the South American Tomato Pinworm, and Diatraea saccharalis (Fabricius), the Sugarcane Borer, respectively. The protocol described here can be used in similar species and includes (a) direct oral delivery by droplets containing dsRNA; (b) oral delivery by tomato leaflets that absorbed dsRNA solution; (c) delivery by Escherichia coli expressing dsRNA; and (d) delivery by transgenic plants expressing dsRNA.
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Affiliation(s)
- Bruna Garbatti Factor
- Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brazil
| | | | - Antonio Figueira
- Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba, SP, Brazil.
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26
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Koch A, Wassenegger M. Host-induced gene silencing - mechanisms and applications. THE NEW PHYTOLOGIST 2021; 231:54-59. [PMID: 33774815 DOI: 10.1111/nph.17364] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/10/2021] [Indexed: 05/05/2023]
Abstract
Host-induced gene silencing (HIGS) technology has emerged as a powerful alternative to chemical treatments for protecting plants from pathogens or pests. More than 170 HIGS studies have been published so far, and HIGS products have been launched. First, we discuss the strengths and limitations of this technology in a pathosystem-specific context. Next, we highlight the requirement for fundamental knowledge on the molecular mechanisms (i.e. uptake, processing and translocation of transgene-expressed double-stranded RNAs) that determine the efficacy and specificity of HIGS. Additionally, we speculate on the contribution of host and target RNA interference machineries, which may be incompatible depending on the lifestyle of the pathogen or pest. Finally, we predict that closing these gaps in knowledge will lead to the development of novel integrative concepts, precise risk assessment and tailor-made HIGS therapy for plant diseases.
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Affiliation(s)
- Aline Koch
- Institute of Phytomedicine, University of Hohenheim, Otto-Sander-Straße 5, Stuttgart, D-70599, Germany
| | - Michael Wassenegger
- RLP AgroScience, Breitenweg 71, Neustadt, 67435, Germany
- Centre for Organismal Studies, University of Heidelberg, Heidelberg, 69120, Germany
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Xia X, Peng CW, Cui JR, Jin PY, Yang K, Hong XY. Wolbachia affects reproduction in the spider mite Tetranychus truncatus (Acari: Tetranychidae) by regulating chorion protein S38-like and Rop. INSECT MOLECULAR BIOLOGY 2021; 30:18-29. [PMID: 32945029 DOI: 10.1111/imb.12669] [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: 05/03/2020] [Revised: 08/20/2020] [Accepted: 09/14/2020] [Indexed: 06/11/2023]
Abstract
Wolbachia-induced reproductive regulation in hosts has been used to control pest populations, but little is known about the molecular mechanism underlying Wolbachia regulation of host genes. Here, reproductive regulation by Wolbachia in the spider mite Tetranychus truncatus was studied at the molecular level. Infection with Wolbachia resulted in decreasing oviposition and cytoplasmic incompatibility in T. truncatus. Further RNA-seq revealed genes regulated by Wolbachia in T. truncatus. Real-time quantitative polymerase chain reaction (qPCR) showed that genes, including chorion protein S38-like and Rop were down-regulated by Wolbachia. RNA interference (RNAi) of chorion protein S38-like and Rop in Wolbachia-uninfected T. truncatus decreased oviposition, which was consistent with Wolbachia-induced oviposition decrease. Interestingly, suppressing Rop in Wolbachia-infected T. truncatus led to increased Wolbachia titres in eggs; however, this did not occur after RNAi of chorion protein S38-like. This is the first study to show that chorion protein S38-like and Rop facilitate Wolbachia-mediated changes in T. truncatus fertility. In addition, RNAi of Rop turned the body colour of Wolbachia-uninfected T. truncatus black, which indicates that the role of Rop is not limited to the reproductive regulation of T. truncatus.
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Affiliation(s)
- X Xia
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - C-W Peng
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - J-R Cui
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - P-Y Jin
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - K Yang
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
| | - X-Y Hong
- Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu, China
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28
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Chen W, Bartley K, Nunn F, Bowman AS, Sternberg JM, Burgess STG, Nisbet AJ, Price DRG. RNAi gene knockdown in the poultry red mite, Dermanyssus gallinae (De Geer 1778), a tool for functional genomics. Parasit Vectors 2021; 14:57. [PMID: 33461614 PMCID: PMC7813172 DOI: 10.1186/s13071-020-04562-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 12/21/2020] [Indexed: 02/07/2023] Open
Abstract
Background The avian haematophagous ectoparasite Dermanyssus gallinae, commonly known as the poultry red mite, causes significant economic losses to the egg-laying industry worldwide and also represents a significant welfare threat. Current acaricide-based controls are unsustainable due to the mite’s ability to rapidly develop resistance, thus developing a novel sustainable means of control for D. gallinae is a priority. RNA interference (RNAi)-mediated gene silencing is a valuable tool for studying gene function in non-model organisms, but is also emerging as a novel tool for parasite control. Methods Here we use an in silico approach to identify core RNAi pathway genes in the recently sequenced D. gallinae genome. In addition we utilise an in vitro feeding device to deliver double-stranded (ds) RNA to D. gallinae targeting the D. gallinae vATPase subunit A (Dg vATPase A) gene and monitor gene knockdown using quantitative PCR (qPCR). Results Core components of the small interfering RNA (siRNA) and microRNA (miRNA) pathways were identified in D. gallinae, which indicates that these gene silencing pathways are likely functional. Strikingly, the P-element-induced wimpy testis (PIWI)-interacting RNA (piRNA) pathway was absent in D. gallinae. In addition, feeding Dg vATPase A dsRNA to adult female D. gallinae resulted in silencing of the targeted gene compared to control mites fed non-specific lacZ dsRNA. In D. gallinae, dsRNA-mediated gene knockdown was rapid, being detectable 24 h after oral delivery of the dsRNA, and persisted for at least 120 h. Conclusions This study shows the presence of core RNAi machinery components in the D. gallinae genome. In addition, we have developed a robust RNAi methodology for targeting genes in D. gallinae that will be of value for studying genes of unknown function and validating potential control targets in D. gallinae. ![]()
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Affiliation(s)
- Wan Chen
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK.,Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3FX, UK
| | - Kathryn Bartley
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK
| | - Francesca Nunn
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK
| | - Alan S Bowman
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3FX, UK
| | - Jeremy M Sternberg
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3FX, UK
| | - Stewart T G Burgess
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK
| | - Alasdair J Nisbet
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK
| | - Daniel R G Price
- Moredun Research Institute, Pentland Science Park, Bush Loan, Penicuik, Midlothian, EH26 0PZ, UK.
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29
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Environmental RNAi pathways in the two-spotted spider mite. BMC Genomics 2021; 22:42. [PMID: 33421998 PMCID: PMC7796550 DOI: 10.1186/s12864-020-07322-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 12/11/2020] [Indexed: 11/10/2022] Open
Abstract
Background RNA interference (RNAi) regulates gene expression in most multicellular organisms through binding of small RNA effectors to target transcripts. Exploiting this process is a popular strategy for genetic manipulation and has applications that includes arthropod pest control. RNAi technologies are dependent on delivery method with the most convenient likely being feeding, which is effective in some animals while others are insensitive. The two-spotted spider mite, Tetranychus urticae, is prime candidate for developing RNAi approaches due to frequent occurrence of conventional pesticide resistance. Using a sequencing-based approach, the fate of ingested RNAs was explored to identify features and conditions that affect small RNA biogenesis from external sources to better inform RNAi design. Results Biochemical and sequencing approaches in conjunction with extensive computational assessment were used to evaluate metabolism of ingested RNAs in T. urticae. This chelicerae arthropod shows only modest response to oral RNAi and has biogenesis pathways distinct from model organisms. Processing of synthetic and plant host RNAs ingested during feeding were evaluated to identify active substrates for spider mite RNAi pathways. Through cataloging characteristics of biochemically purified RNA from these sources, trans-acting small RNAs could be distinguished from degradation fragments and their origins documented. Conclusions Using a strategy that delineates small RNA processing, we found many transcripts have the potential to enter spider mite RNAi pathways, however, trans-acting RNAs appear very unstable and rare. This suggests potential RNAi pathway substrates from ingested materials are mostly degraded and infrequently converted into regulators of gene expression. Spider mites infest a variety of plants, and it would be maladaptive to generate diverse gene regulators from dietary RNAs. This study provides a framework for assessing RNAi technology in organisms where genetic and biochemical tools are absent and benefit rationale design of RNAi triggers for T.urticae.
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30
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Environmental RNA interference in two-spotted spider mite, Tetranychus urticae, reveals dsRNA processing requirements for efficient RNAi response. Sci Rep 2020; 10:19126. [PMID: 33154461 PMCID: PMC7644771 DOI: 10.1038/s41598-020-75682-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 10/16/2020] [Indexed: 12/13/2022] Open
Abstract
Comprehensive understanding of pleiotropic roles of RNAi machinery highlighted the conserved chromosomal functions of RNA interference. The consequences of the evolutionary variation in the core RNAi pathway genes are mostly unknown, but may lead to the species-specific functions associated with gene silencing. The two-spotted spider mite, Tetranychus urticae, is a major polyphagous chelicerate pest capable of feeding on over 1100 plant species and developing resistance to pesticides used for its control. A well annotated genome, susceptibility to RNAi and economic importance, make T. urticae an excellent candidate for development of an RNAi protocol that enables high-throughput genetic screens and RNAi-based pest control. Here, we show that the length of the exogenous dsRNA critically determines its processivity and ability to induce RNAi in vivo. A combination of the long dsRNAs and the use of dye to trace the ingestion of dsRNA enabled the identification of genes involved in membrane transport and 26S proteasome degradation as sensitive RNAi targets. Our data demonstrate that environmental RNAi can be an efficient reverse genetics and pest control tool in T. urticae. In addition, the species-specific properties together with the variation in the components of the RNAi machinery make T. urticae a potent experimental system to study the evolution of RNAi pathways.
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Namin HH, Zhurov V, Spenler J, Grbić M, Grbić V, Scott IM. Resistance to pyridaben in Canadian greenhouse populations of two-spotted spider mites, Tetranychus urticae (Koch). PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2020; 170:104677. [PMID: 32980052 DOI: 10.1016/j.pestbp.2020.104677] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 08/06/2020] [Accepted: 08/07/2020] [Indexed: 06/11/2023]
Abstract
Two-spotted spider mite (TSSM) Tetranychus urticae (Koch) is an important agricultural pest that causes considerable yield losses to over 150 field and greenhouse crops. Mitochondrial electron transport inhibitors (METI) acaricides are commonly used to control mite species in commercial Canadian greenhouses. Development of resistance to METIs in TSSM populations have been reported worldwide, but not until recently in Canada. The objectives of this study were to: 1) monitor the acaricide-susceptibility in greenhouse TSSM populations, and 2) investigate the resistance to pyridaben, a METI acaricide, in greenhouse resistant and pyridaben-selected (SRS) mite strains. The increased mortality to the pyridaben sub-lethal concentration (LC30) when SRS mites were exposed to piperonyl butoxide (PBO), a general cytochrome P450 monooxygenase inhibitor, and higher P450 activity compared to the greenhouse strain (RS) mites, indicated that P450s may be at least partially responsible for the resistance. The molecular mechanisms of target site insensitivity-mediated resistance in the pyridaben resistant strain of TSSM were investigated by comparing the DNA sequence of NADH dehydrogenase subunits TYKY and PSST, NADH-ubiquinone oxidoreductase chain 1 and 5 (ND1, ND5) and the NADH-ubiquinone oxidoreductase subunit 49 kDa from SRS to the reference strain (SS) and RS. Despite a number of nucleotide substitutions, none correlated with the pyridaben resistance. Understanding the underlying mechanisms of TSSM adaptation to acaricides is an essential part of resistance management strategy in any IPM program. The findings of this study will encourage growers to apply acaricides with different modes of action to reduce the rate at which acaricide resistance will occur in greenhouse TSSM populations.
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Affiliation(s)
| | - Vladimir Zhurov
- Department of Biology, The University of Western Ontario, London, Ontario, Canada
| | - Jeremy Spenler
- Department of Biology, The University of Western Ontario, London, Ontario, Canada
| | - Miodrag Grbić
- Department of Biology, The University of Western Ontario, London, Ontario, Canada
| | - Vojislava Grbić
- Department of Biology, The University of Western Ontario, London, Ontario, Canada
| | - Ian M Scott
- Agriculture and Agri-Food Canada, London Research and Development Centre, London, Ontario, Canada.
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Ojeda-Martinez D, Martinez M, Diaz I, Santamaria ME. Saving time maintaining reliability: a new method for quantification of Tetranychus urticae damage in Arabidopsis whole rosettes. BMC PLANT BIOLOGY 2020; 20:397. [PMID: 32854637 PMCID: PMC7450957 DOI: 10.1186/s12870-020-02584-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 07/29/2020] [Indexed: 05/06/2023]
Abstract
BACKGROUND The model species Tetranychus urticae produces important plant injury and economic losses in the field. The current accepted method for the quantification of the spider mite damage in Arabidopsis whole rosettes is time consuming and entails a bottleneck for large-scale studies such as mutant screening or quantitative genetic analyses. Here, we describe an improved version of the existing method by designing an automatic protocol. The accuracy, precision, reproducibility and concordance of the new enhanced approach are validated in two Arabidopsis accessions with opposite damage phenotypes. Results are compared to the currently available manual method. RESULTS Image acquisition experiments revealed that the automatic settings plus 10 values of brightness and the black background are the optimal conditions for a specific recognition of spider mite damage by software programs. Among the different tested methods, the Ilastik-Fiji tandem based on machine learning was the best procedure able to quantify the damage maintaining the differential range of damage between accessions. In addition, the Ilastik-Fiji tandem method showed the lowest variability within a set of conditions and the highest stability under different lighting or background surroundings. Bland-Altman concordance results pointed out a negative value for Ilastik-Fiji, which implies a minor estimation of the damage when compared to the manual standard method. CONCLUSIONS The novel approach using Ilastik and Fiji programs entails a great improvement for the quantification of the specific spider mite damage in Arabidopsis whole rosettes. The automation of the proposed method based on interactive machine learning eliminates the subjectivity and inter-rater-variability of the previous manual protocol. Besides, this method offers a robust tool for time saving and to avoid the damage overestimation observed with other methods.
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Affiliation(s)
- Dairon Ojeda-Martinez
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
| | - Manuel Martinez
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Madrid, Spain
| | - Isabel Diaz
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Madrid, Spain
| | - M Estrella Santamaria
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain.
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Ghazy NA, Okamura M, Sai K, Yamakawa S, Hamdi FA, Grbic V, Suzuki T. A Leaf-Mimicking Method for Oral Delivery of Bioactive Substances Into Sucking Arthropod Herbivores. FRONTIERS IN PLANT SCIENCE 2020; 11:1218. [PMID: 32849754 PMCID: PMC7431704 DOI: 10.3389/fpls.2020.01218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 07/27/2020] [Indexed: 05/22/2023]
Abstract
Spider mites (Acari: Tetranychidae) are pests of a wide range of agricultural crops, vegetables, and ornamental plants. Their ability to rapidly develop resistance to synthetic pesticides has prompted the development of new strategies for their control. Evaluation of synthetic pesticides and bio-pesticides-and more recently the identification of RNA interference (RNAi) target genes-requires an ability to deliver test compounds efficiently. Here we describe a novel method that uses a sheet-like structure mimicking plant leaves and allows for oral delivery of liquid test compounds to a large number of individuals in a limited area simultaneously (~100 mites cm-2). The main component is a fine nylon mesh sheet that holds the liquid within each pore, much like a plant cell, and consequently allows for greater distribution of specific surface area even in small amounts (10 µl cm-2 for 100-µm mesh opening size). The nylon mesh sheet is placed on a solid plane (e.g., the undersurface of a Petri dish), a solution or suspension of test compounds is pipetted into the mesh sheet, and finally a piece of paraffin wax film is gently stretched above the mesh so that the test mites can feed through it. We demonstrate the use of the method for oral delivery of a tracer dye (Brilliant Blue FCF), pesticides (abamectin and bifenazate), dsRNA targeting the Vacuolar-type H+-VATPase gene, or fluorescent nanoparticles to three species of Tetranychus spider mites (Acari: Tetranychidae) and to the cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae). The method is fast, easy, and highly reproducible and can be adapted to facilitate several aspects of bioassays.
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Affiliation(s)
- Noureldin Abuelfadl Ghazy
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
- Agriculture Zoology Department, Faculty of Agriculture, Mansoura University, El-Mansoura, Egypt
- Japan Society for the Promotion of Science, Chiyoda, Japan
| | - Mayo Okamura
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Kanae Sai
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Sota Yamakawa
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Faten Abdelsalam Hamdi
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
| | - Vojislava Grbic
- Department of Biology, The University of Western Ontario, London, ON, Canada
- Instituto de Ciencias de la Vid y el Vino, Logrono, Spain
| | - Takeshi Suzuki
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan
- Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Koganei, Japan
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Liu J, Legarrea S, Alba JM, Dong L, Chafi R, Menken SBJ, Kant MR. Juvenile Spider Mites Induce Salicylate Defenses, but Not Jasmonate Defenses, Unlike Adults. FRONTIERS IN PLANT SCIENCE 2020; 11:980. [PMID: 32754172 PMCID: PMC7367147 DOI: 10.3389/fpls.2020.00980] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 06/16/2020] [Indexed: 05/25/2023]
Abstract
When plants detect herbivores they strengthen their defenses. As a consequence, some herbivores evolved the means to suppress these defenses. Research on induction and suppression of plant defenses usually makes use of particular life stages of herbivores. Yet many herbivorous arthropods go through development cycles in which their successive stages have different characteristics and lifestyles. Here we investigated the interaction between tomato defenses and different herbivore developmental stages using two herbivorous spider mites, i.e., Tetranychus urticae of which the adult females induce defenses and T. evansi of which the adult females suppress defenses in Solanum lycopersicum (tomato). First, we monitored egg-to-adult developmental time on tomato wild type (WT) and the mutant defenseless-1 (def-1, unable to produce jasmonate-(JA)-defenses). Then we assessed expression of salivary effector genes (effector 28, 84, SHOT2b, and SHOT3b) in the consecutive spider mite life stages as well as adult males and females. Finally, we assessed the extent to which tomato plants upregulate JA- and salicylate-(SA)-defenses in response to the consecutive mite developmental stages and to the two sexes. The consecutive juvenile mite stages did not induce JA defenses and, accordingly, egg-to-adult development on WT and def-1 did not differ for either mite species. Their eggs however appeared to suppress the SA-response. In contrast, all the consecutive feeding stages upregulated SA-defenses with the strongest induction by T. urticae larvae. Expression of effector genes was higher in the later developmental stages. Comparing expression in adult males and females revealed a striking pattern: while expression of effector 84 and SHOT3b was higher in T. urticae females than in males, this was the opposite for T. evansi. We also observed T. urticae females to upregulate tomato defenses, while T. evansi females did not. In addition, of both species also the males did not upregulate defenses. Hence, we argue that mite ontogenetic niche shifts and stage-specific composition of salivary secreted proteins probably together determine the course and efficiency of induced tomato defenses.
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Affiliation(s)
- Jie Liu
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
- State Key Laboratory of Rice Biology & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China
| | - Saioa Legarrea
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Juan M. Alba
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Lin Dong
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Rachid Chafi
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Steph B. J. Menken
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
| | - Merijn R. Kant
- Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands
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Yang J, Zhang Y, Zhao J, Gao Y, Liu Z, Zhang P, Fan J, Zhou X, Fan R. Selection of Reference Genes for RT-qPCR Analysis Under Extrinsic Conditions in the Hawthorn Spider Mite, Amphitetranychus viennensis. Front Physiol 2020; 11:378. [PMID: 32372977 PMCID: PMC7187807 DOI: 10.3389/fphys.2020.00378] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 03/30/2020] [Indexed: 01/19/2023] Open
Abstract
Hawthorn spider mite, Amphitetranychus viennensis Zacher, is an economically important arthropod pest for fruit trees and woody ornamental plants. Extensive and repetitive use of synthetic acaricides has led to the development of resistance in A. viennensis. To understand the molecular basis of pesticide resistance, and to develop genetic-based control alternatives (e.g., RNAi-based biopesticides), a standardized protocol for real-time quantitative reverse transcription PCR (RT-qPCR) is needed. In the proceeding phase of this research, we screened for the internal references for RT-qPCR analysis from a pool of A. viennensis housekeeping genes under the intrinsic conditions, including developmental stage, sex, and diapause. Here, we continued our efforts to search for the reference genes under an array of extrinsic conditions, including temperature, humidity, photoperiod, host plant, and dietary RNAi. The stability of these candidate reference genes was investigated using geNorm, NormFinder, BestKeeper, and ΔCt method, respectively. Finally, RefFinder, a statistical platform integrating all four algorisms, provided a comprehensive list of genes for each extrinsic condition: (1) EF1A, α-tubulin and Actin3 were the best candidates for temperature, (2) GAPDH, 18S, and Actin3 were the most stable genes for humidity, (3) V-ATPase B, Actin3, and 18S were the top reference genes for photoperiod, (4) GAPDH, V-ATPase B, and α-tubulin were recommended for host plants, and (5) GAPDH, V-ATPase B, and RPS9 were the top choices for dietary RNAi. Overall, V-ATPase B, GAPDH, and Actin3 were the most commonly selected reference genes in A. viennensis regardless of the experimental conditions, including both intrinsic and extrinsic. Information present here lays the foundation for the genomic and functional genomic research in A. viennensis.
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Affiliation(s)
- Jing Yang
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China.,Department of Entomology, University of Kentucky, Lexington, KY, United States
| | - Yuying Zhang
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Jin Zhao
- Research Institute of Applied Biology, Shanxi University, Taiyuan, China
| | - Yue Gao
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Zhongfang Liu
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Pengjiu Zhang
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Jianbin Fan
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
| | - Xuguo Zhou
- Department of Entomology, University of Kentucky, Lexington, KY, United States
| | - Renjun Fan
- College of Plant Protection, Shanxi Agricultural University (Institute of Plant Protection, Shanxi Academy of Agricultural Science), Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan, China
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Dermauw W, Jonckheere W, Riga M, Livadaras I, Vontas J, Van Leeuwen T. Targeted mutagenesis using CRISPR-Cas9 in the chelicerate herbivore Tetranychus urticae. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2020; 120:103347. [PMID: 32114158 DOI: 10.1016/j.ibmb.2020.103347] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 02/04/2020] [Accepted: 02/25/2020] [Indexed: 06/10/2023]
Abstract
The use of CRISPR-Cas9 has revolutionized functional genetic work in many organisms, including more and more insect species. However, successful gene editing or genetic transformation has not yet been reported for chelicerates, the second largest group of terrestrial animals. Within this group, some mite and tick species are economically very important for agriculture and human health, and the availability of a gene-editing tool would be a significant advancement for the field. Here, we report on the use of CRISPR-Cas9 in the spider mite Tetranychus urticae. The ovary of virgin adult females was injected with a mix of Cas9 and sgRNAs targeting the phytoene desaturase gene. Natural mutants of this laterally transferred gene have previously shown an easy-to-score albino phenotype. Albino sons of injected virgin females were mated with wild-type females, and two independent transformed lines where created and further characterized. Albinism inherited as a recessive monogenic trait. Sequencing of the complete target-gene of both lines revealed two different lesions at expected locations near the PAM site in the target-gene. Both lines did not genetically complement each other in dedicated crosses, nor when crossed to a reference albino strain with a known genetic defect in the same gene. In conclusion, two independent mutagenesis events were induced in the spider mite T. urticae using CRISPR-Cas9, hereby providing proof-of-concept that CRISPR-Cas9 can be used to create gene knockouts in mites.
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Affiliation(s)
- Wannes Dermauw
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium.
| | - Wim Jonckheere
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Maria Riga
- Molecular Entomology Lab, Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology (FORTH), Nikolaou Plastira Street 100, 70013, Heraklion, Crete, Greece
| | - Ioannis Livadaras
- Molecular Entomology Lab, Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology (FORTH), Nikolaou Plastira Street 100, 70013, Heraklion, Crete, Greece
| | - John Vontas
- Molecular Entomology Lab, Institute of Molecular Biology and Biotechnology (IMBB), Foundation for Research and Technology (FORTH), Nikolaou Plastira Street 100, 70013, Heraklion, Crete, Greece; Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Thomas Van Leeuwen
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium.
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Santamaria ME, Arnaiz A, Rosa-Diaz I, González-Melendi P, Romero-Hernandez G, Ojeda-Martinez DA, Garcia A, Contreras E, Martinez M, Diaz I. Plant Defenses Against Tetranychus urticae: Mind the Gaps. PLANTS 2020; 9:plants9040464. [PMID: 32272602 PMCID: PMC7238223 DOI: 10.3390/plants9040464] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 04/01/2020] [Accepted: 04/03/2020] [Indexed: 01/24/2023]
Abstract
The molecular interactions between a pest and its host plant are the consequence of an evolutionary arms race based on the perception of the phytophagous arthropod by the plant and the different strategies adopted by the pest to overcome plant triggered defenses. The complexity and the different levels of these interactions make it difficult to get a wide knowledge of the whole process. Extensive research in model species is an accurate way to progressively move forward in this direction. The two-spotted spider mite, Tetranychus urticae Koch has become a model species for phytophagous mites due to the development of a great number of genetic tools and a high-quality genome sequence. This review is an update of the current state of the art in the molecular interactions between the generalist pest T. urticae and its host plants. The knowledge of the physical and chemical constitutive defenses of the plant and the mechanisms involved in the induction of plant defenses are summarized. The molecular events produced from plant perception to the synthesis of defense compounds are detailed, with a special focus on the key steps that are little or totally uncovered by previous research.
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Affiliation(s)
- M. Estrella Santamaria
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Ana Arnaiz
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Irene Rosa-Diaz
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Pablo González-Melendi
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, UPM, 28040 Madrid, Spain
| | - Gara Romero-Hernandez
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Dairon A. Ojeda-Martinez
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Alejandro Garcia
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Estefania Contreras
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
| | - Manuel Martinez
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, UPM, 28040 Madrid, Spain
| | - Isabel Diaz
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de Madrid, UPM, 28223 Madrid, Spain; (M.E.S.); (A.A.); (I.R.-D.); (P.G.-M.); (G.R.-H.); (D.A.O.-M.); (A.G.); (E.C.); (M.M.)
- Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, UPM, 28040 Madrid, Spain
- Correspondence: ; Tel.: +34-910679180
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Abstract
The RNA interference (RNAi) triggered by short/small interfering RNA (siRNA) was discovered in nematodes and found to function in most living organisms. RNAi has been widely used as a research tool to study gene functions and has shown great potential for the development of novel pest management strategies. RNAi is highly efficient and systemic in coleopterans but highly variable or inefficient in many other insects. Differences in double-stranded RNA (dsRNA) degradation, cellular uptake, inter- and intracellular transports, processing of dsRNA to siRNA, and RNA-induced silencing complex formation influence RNAi efficiency. The basic dsRNA delivery methods include microinjection, feeding, and soaking. To improve dsRNA delivery, various new technologies, including cationic liposome-assisted, nanoparticle-enabled, symbiont-mediated, and plant-mediated deliveries, have been developed. Major challenges to widespread use of RNAi in insect pest management include variable RNAi efficiency among insects, lack of reliable dsRNA delivery methods, off-target and nontarget effects, and potential development of resistance in insect populations.
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Affiliation(s)
- Kun Yan Zhu
- Department of Entomology, Kansas State University, Manhattan, Kansas 66506, USA;
| | - Subba Reddy Palli
- Department of Entomology, University of Kentucky, Lexington, Kentucky 40546, USA;
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Dalakouras A, Wassenegger M, Dadami E, Ganopoulos I, Pappas ML, Papadopoulou K. Genetically Modified Organism-Free RNA Interference: Exogenous Application of RNA Molecules in Plants. PLANT PHYSIOLOGY 2020; 182:38-50. [PMID: 31285292 PMCID: PMC6945881 DOI: 10.1104/pp.19.00570] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 06/28/2019] [Indexed: 05/08/2023]
Abstract
The latest advances in the field exogenous application of RNA molecules in plants help to protect and modify them through RNA interference (RNAi).
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Affiliation(s)
- Athanasios Dalakouras
- University of Thessaly, Department of Biochemistry and Biotechnology, 41500 Larissa, Greece
- Institute of Plant Breeding and Genetic Resources Hellenic Agricultural Organization (ELGO)-DEMETER, 57001 Thessaloniki, Greece
| | - Michael Wassenegger
- RLP AgroScience, Alplanta Institute for Plant Research, 67435 Neustadt an der Weinstrasse, Germany
| | - Elena Dadami
- University of Thessaly, Department of Biochemistry and Biotechnology, 41500 Larissa, Greece
| | - Ioannis Ganopoulos
- Institute of Plant Breeding and Genetic Resources Hellenic Agricultural Organization (ELGO)-DEMETER, 57001 Thessaloniki, Greece
| | - Maria L Pappas
- Democritus University of Thrace, Department of Agricultural Development, 68200 Orestiada, Greece
| | - Kalliope Papadopoulou
- University of Thessaly, Department of Biochemistry and Biotechnology, 41500 Larissa, Greece
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Yang J, Gao Y, Liu Z, Lu J, Zhang Y, Zhang P, Fan J, Zhou X, Fan R. Selection of Reference Genes for RT-qPCR Analysis Under Intrinsic Conditions in the Hawthorn Spider Mite, Amphitetranychus viennensis (Acarina: Tetranychidae). Front Physiol 2019; 10:1427. [PMID: 31803072 PMCID: PMC6877696 DOI: 10.3389/fphys.2019.01427] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 11/04/2019] [Indexed: 12/12/2022] Open
Abstract
Hawthorn spider mite, Amphitetranychus viennensis Zacher, is one of the most devastating pests of deciduous fruit trees. The overall goal of this research is to develop a standardized protocol for real-time quantitative reverse transcription PCR (RT-qPCR) analysis in A. viennensis following the MIQE (minimum information for publication of Quantitative real time PCR experiments) guidelines. Based on the previous knowledge, we hypothesized that internal references for RT-qPCR analysis reside in housekeeping genes (HKGs). To test this hypothesis, we examined the stability of nine HKGs from A. viennensis, including 18S ribosomal RNA (18S), 28S ribosomal RNA (28S), Elongation factor 1-alpha (EF1A), Actin3, V-ATP vacuolar-type H+-ATPase (V-ATPase), α-tubulin (α-tubulin), Ribosomal protein L13 (RPL13), 40S ribosomal protein S9 (RPS9), and Glyceraldehyde 3-phosphate dehydrogenase (GAPDH). The expression profile of these candidates under intrinsic conditions was evaluated by a panel of computational programs, including geNorm, Normfinder, BestKeeper, and ΔCt method. Based on RefFinder, a comprehensive software integrating all four above-mentioned algorithms, V-ATPase, Actin3, and GAPDH are the top three reference genes, which are stably expressed across all the intrinsic conditions, including developmental stage, sex, and diapause. In addition, we compared reference genes recommended for different developmental stages among the nine cell-content feeding arthropods, including four spider mites, A. viennensis, Tetranychus urticae, Tetranychus cinnabarinus, and Panonychus citri, and five hemipterans, Myzus persicae, Aphis gossypii, Toxoptera citricida, Lipaphis erysimi, and Sogatella furcifera. Not surprisingly, rRNAs and ribosomal proteins, the most abundant RNA species, is the top choice, and follows by EF1A, Actin, GAPDH, and tubulin. Information present here lays the foundation for the genomic and functional genomic research in cell-content feeding arthropods in general and A. viennensis in particular.
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Affiliation(s)
- Jing Yang
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China.,Department of Entomology, University of Kentucky, Lexington, KY, United States
| | - Yue Gao
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
| | - Zhongfang Liu
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
| | - Junjiao Lu
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
| | - Yuying Zhang
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
| | - Pengjiu Zhang
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
| | - Jianbin Fan
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
| | - Xuguo Zhou
- Department of Entomology, University of Kentucky, Lexington, KY, United States
| | - Renjun Fan
- Shanxi Key Laboratory of Integrated Pest Management in Agriculture (IPMA), Institute of Plant Protection, Shanxi Academy of Agricultural Sciences, Taiyuan, China
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Zhang Y, Xu L, Li S, Zhang J. Bacteria-Mediated RNA Interference for Management of Plagiodera versicolora (Coleoptera: Chrysomelidae). INSECTS 2019; 10:insects10120415. [PMID: 31766384 PMCID: PMC6955681 DOI: 10.3390/insects10120415] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 01/08/2023]
Abstract
RNA interference (RNAi) has emerged as a novel and feasible strategy for pest management. Methods for cost-effective production and stable delivery of double-stranded RNA (dsRNA) to the target insects are crucial for the wide application of RNAi for pest control. In this study, we tested the expression of dsRNA in RNaseIII-deficient Escherichia coli HT115 which was then fed to Plagiodera versicolora larvae, an insect pest of Salicaceae plants worldwide. By targeting six potential genes, including actin (ACT), signal recognition particle protein 54k (SRP54), heat shock protein 70 (HSC70), shibire (SHI), cactus (CACT), and soluble N-ethylmaleimide-sensitive fusion attachment proteins (SNAP), we found that feeding bacteria-expressed dsRNA successfully triggered the silencing of the five target genes tested and the suppression of ACT and SRP54 genes caused significant mortality. Our results suggest that the oral delivery of bacteria-expressed dsRNA is a potential alternative for the control of P. versicolora, and that ACT and SRP54 genes are the potent targets.
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The sex- and duration-dependent effects of intermittent fasting on lifespan and reproduction of spider mite Tetranychus urticae. Front Zool 2019; 16:10. [PMID: 31007704 PMCID: PMC6458716 DOI: 10.1186/s12983-019-0310-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 03/29/2019] [Indexed: 11/19/2022] Open
Abstract
Background Intermittent fasting (IF) is receiving increasing attention as an alternative to continuous restriction of calories because of its benefits in aging-related disease prevention and lifespan extension. However, whether both sexes with sexual dimorphism have similar response to IF have rarely been assayed. In this study, we determined how different durations of IF influence lifespan and whether males and females differed in their responses to IF. We also tested whether there is a trade-off between lifespan and lifetime reproduction in females under IF. Method We used spider mite Tetranychus urticae, with female-biased sexual size dimorphism (SSD), as our model species to investigate the survival and lifespan difference of both sexes at different durations of IF regimes, and explore the association between longevity and fecundity in females within and across treatments. Results The lifespan of females increased before intermediate level of IF and then decreased afterwards, but males showed a decreasing trend in lifespan when subjected to IF. Within each treatment, female longevity was positively associated with their fecundity. However, the females fed ad libitum had a higher lifetime fecundity with a shorter lifespan, whereas mites fed 50% IF outlived ad libitum fed ones with lower fecundity because of the later onset of reproduction and lower daily fecundity, showing clear survival and reproduction trade-off when variation of resource availability enhanced across treatments. Conclusion We showed sex-specific response to IF in lifespan, indicating that sexes with SSD have different optimal level of IF. These findings showed trade-off between survival and reproduction between treatments but not within treatments, suggesting that variation in resource availability is the necessary precondition for life history trade-off, and IF extends lifespan of females at the cost of reproductive success.
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Zhu L, Zhang W, Li G, Sun QZ, Wang JJ, Smagghe G, Jiang HB. Molecular characterization of ecdysis triggering hormone and its receptor in citrus red mite (Panonychus citri). Comp Biochem Physiol A Mol Integr Physiol 2019; 230:100-105. [DOI: 10.1016/j.cbpa.2019.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 12/22/2018] [Accepted: 01/02/2019] [Indexed: 01/07/2023]
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Santamaría ME, Martínez M, Arnaiz A, Rioja C, Burow M, Grbic V, Díaz I. An Arabidopsis TIR-Lectin Two-Domain Protein Confers Defense Properties against Tetranychus urticae. PLANT PHYSIOLOGY 2019; 179:1298-1314. [PMID: 30765478 PMCID: PMC6446783 DOI: 10.1104/pp.18.00951] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 02/04/2019] [Indexed: 05/13/2023]
Abstract
Plant immunity depends on fast and specific transcriptional reprogramming triggered by the perception of biotic stresses. Numerous studies have been conducted to better understand the response of plants to the generalist herbivore two-spotted spider mite (Tetranychus urticae). However, how plants perceive mites and how this perception is translated into changes in gene expression are largely unknown. In this work, we identified a gene induced in Arabidopsis (Arabidopsis thaliana) upon spider mite attack that encodes a two-domain protein containing predicted lectin and Toll/Interleukin-1 receptor domains. The gene, previously named PP2-A5, belongs to the Phloem Protein2 family. Biotic assays showed that PP2-A5 confers tolerance to T. urticae Overexpression or knockout of PP2-A5 leads to transcriptional reprogramming that alters the balance of hormone accumulation and corresponding signaling pathways. The nucleocytoplasmic location of this protein supports a direct interaction with regulators of gene transcription, suggesting that the combination of two putative signaling domains in a single protein may provide a novel mechanism for regulating gene expression. Together, our results suggest that PP2-A5 improves the ability to defend against T. urticae by participating in the tight regulation of hormonal cross talk upon mite feeding. Further research is needed to determine the mechanism by which this two-domain protein functions and to clarify its molecular role in signaling following a spider mite attack.
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Affiliation(s)
- M Estrella Santamaría
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Campus de Montegancedo, 28223 Madrid, Spain
- Departamento de Biotecnología y Biología Vegetal-Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, 28040 Madrid, Spain
| | - Manuel Martínez
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Campus de Montegancedo, 28223 Madrid, Spain
- Departamento de Biotecnología y Biología Vegetal-Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, 28040 Madrid, Spain
| | - Ana Arnaiz
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Campus de Montegancedo, 28223 Madrid, Spain
| | - Cristina Rioja
- DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg C, Denmark
| | - Meike Burow
- DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg C, Denmark
| | - Vojislava Grbic
- Department of Biology, University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Isabel Díaz
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Campus de Montegancedo, 28223 Madrid, Spain
- Departamento de Biotecnología y Biología Vegetal-Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, 28040 Madrid, Spain
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Abouelmaaty HG, Fukushi M, Abouelmaaty AG, Ghazy NA, Suzuki T. Leaf disc-mediated oral delivery of small molecules in the absence of surfactant to the two-spotted spider mite, Tetranychus urticae. EXPERIMENTAL & APPLIED ACAROLOGY 2019; 77:1-10. [PMID: 30604195 DOI: 10.1007/s10493-018-0335-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 12/12/2018] [Indexed: 05/12/2023]
Abstract
The two-spotted spider mite (TSSM), Tetranychus urticae, is a chelicerate herbivore with a wide host range and strong ability to develop pesticide resistance. Experimental TSSM populations are easy to maintain, and the recent publication of the complete TSSM genome sequence and development of RNA interference-based reverse genetics protocols make this species an ideal chelicerate model for the study of pesticide resistance and plant-herbivore interactions. In such studies, treated leaf discs are often used for oral delivery of test compounds. When preparing these leaf discs, the organosilicone surfactant Silwet L-77 is used to promote wetting of the leaf surface and distribution of the test compound across the entire leaf surface. Here, we examined the toxicity of Silwet L-77 and found it to be toxic to TSSMs. We then developed a novel means of preparing leaf discs in which a polypropylene sheet rather than Silwet L-77 was used to ensure distribution of a tracer dye across the entire leaf surface. These leaf discs were then successfully used to deliver the tracer dye into the midgut of TSSMs. No significant differences were observed in the survival, fecundity, or feeding activity of TSSMs fed on leaf discs treated with water via our novel method compared with those fed on untreated leaf discs. Thus, our novel method of preparing leaf discs eliminates concerns regarding the bioactivity of surfactants in TSSMs, and we anticipate that it will be useful for improving oral delivery-based bioassays that use TSSMs.
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Affiliation(s)
- Hebatallah Galal Abouelmaaty
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
- Plant Protection Research Institute, Agriculture Research Center, Dokki, Giza, 12311, Egypt
| | - Mimoe Fukushi
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
| | - Ayatallah Galal Abouelmaaty
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
| | - Noureldin Abuelfadl Ghazy
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
- Agriculture Zoology Department, Faculty of Agriculture, Mansoura University, El-Mansoura, 35516, Egypt
| | - Takeshi Suzuki
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan.
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de Lillo E, Pozzebon A, Valenzano D, Duso C. An Intimate Relationship Between Eriophyoid Mites and Their Host Plants - A Review. FRONTIERS IN PLANT SCIENCE 2018; 9:1786. [PMID: 30564261 PMCID: PMC6288765 DOI: 10.3389/fpls.2018.01786] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 11/16/2018] [Indexed: 05/20/2023]
Abstract
Eriophyoid mites (Acari Eriophyoidea) are phytophagous arthropods forming intimate relationships with their host plants. These mites are associated with annual and perennial plants including ferns, and are highly specialized with a dominant monophagy. They can be classified in different ecological classes, i.e., vagrant, gall-making and refuge-seeking species. Many of them are major pests and some of them are vectors of plant pathogens. This paper critically reviews the knowledge on eriophyoids of agricultural importance with emphasis on sources for host plant resistance to these mites. The role of species belonging to the family Eriophyidae as vectors of plant viruses is discussed. Eriophyoid-host plant interactions, the susceptibility within selected crops and main host plant tolerance/resistance mechanisms are discussed. Fundamental concepts, subjects, and problems emerged in this review are pointed out and studies are suggested to clarify some controversial points.
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Affiliation(s)
- Enrico de Lillo
- Department of Soil, Plant and Food Sciences, Entomological and Zoological Section, University of Bari Aldo Moro, Bari, Italy
| | - Alberto Pozzebon
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Padova, Italy
| | - Domenico Valenzano
- Department of Soil, Plant and Food Sciences, Entomological and Zoological Section, University of Bari Aldo Moro, Bari, Italy
| | - Carlo Duso
- Department of Agronomy, Food, Natural Resources, Animals and Environment, University of Padova, Padova, Italy
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Niu J, Shen G, Christiaens O, Smagghe G, He L, Wang J. Beyond insects: current status and achievements of RNA interference in mite pests and future perspectives. PEST MANAGEMENT SCIENCE 2018; 74:2680-2687. [PMID: 29749092 DOI: 10.1002/ps.5071] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/19/2018] [Accepted: 05/07/2018] [Indexed: 05/28/2023]
Abstract
Mites comprise a group of key agricultural pests on a wide range of crops. They cause harm through feeding on the plant and transferring dangerous pathogens, and the rapid evolution of pesticide resistance in mites highlights the need for novel control methods. Currently, RNA interference (RNAi) shows great potential for insect pest control. Here, we review the literature regarding RNAi in mite pests. We discuss different target genes and RNAi efficiency in various mite species, a promising Varroa control program using RNAi, the synergy of RNAi with plant defense mechanisms and microorganisms, and current understanding of systemic movement of double-stranded RNA (dsRNA). On the basis of this evidence, we can conclude that there is clear potential for application of RNAi-based mite control, but further research on several aspects of RNAi in mites is needed, including: (i) the factors influencing RNAi efficiency, (ii) the mechanism of environmental RNAi and cross-kingdom dsRNA trafficking, (iii) the mechanism of possible systemic and parental RNAi, and (iv) non-target effects, specifically in predatory mites, which should be considered during RNAi target selection. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Jinzhi Niu
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
- Academy of Agricultural Sciences, Southwest University, Chongqing, China
| | - Guangmao Shen
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
- Academy of Agricultural Sciences, Southwest University, Chongqing, China
| | - Olivier Christiaens
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Guy Smagghe
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
- Academy of Agricultural Sciences, Southwest University, Chongqing, China
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Lin He
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
- Academy of Agricultural Sciences, Southwest University, Chongqing, China
| | - Jinjun Wang
- Key Laboratory of Entomology and Pest Control Engineering, College of Plant Protection, Southwest University, Chongqing, China
- Academy of Agricultural Sciences, Southwest University, Chongqing, China
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Yoon JS, Sahoo DK, Maiti IB, Palli SR. Identification of target genes for RNAi-mediated control of the Twospotted Spider Mite. Sci Rep 2018; 8:14687. [PMID: 30279530 PMCID: PMC6168543 DOI: 10.1038/s41598-018-32742-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 09/11/2018] [Indexed: 01/19/2023] Open
Abstract
RNA interference (RNAi) is being developed for the management of pests that destroy crops. The twospotted Spider Mite (TSSM), Tetranychus urticae is a worldwide pest due to its unique physiological and behavioral characteristics including extraordinary ability to detoxify a wide range of pesticides and feed on many host plants. In this study, we conducted experiments to identify target genes that could be used for the development of RNAi-based methods to control TSSM. Leaf disc feeding assays revealed that knockdown in the expression genes coding for proteins involved in the biosynthesis and action of juvenile hormone (JH) and action of ecdysteroids [Methoprene-tolerant (Met), retinoid X receptor β, farnesoic acid O-methyltransferase, and CREB-binding protein] caused 35-56% mortality. Transgenic tobacco plants expressing hairpin dsRNA targeting Met gene were generated and tested. About 48% mortality was observed in TSSM raised on transgenic tobacco plants expressing dsMet. These studies not only broaden our knowledge on understanding hormone action in TSSM but also identified target genes that could be used in RNAi-mediated control of TSSM.
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Affiliation(s)
- June-Sun Yoon
- Department of Entomology, University of Kentucky, Lexington, Kentucky, 40546, USA
| | - Dipak K Sahoo
- KTRDC, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, 40546, USA
- Department of Agronomy, Iowa State University, Ames, IA, 50011, USA
| | - Indu B Maiti
- KTRDC, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, 40546, USA
| | - Subba R Palli
- Department of Entomology, University of Kentucky, Lexington, Kentucky, 40546, USA.
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Bensoussan N, Zhurov V, Yamakawa S, O'Neil CH, Suzuki T, Grbić M, Grbić V. The Digestive System of the Two-Spotted Spider Mite, Tetranychus urticae Koch, in the Context of the Mite-Plant Interaction. FRONTIERS IN PLANT SCIENCE 2018; 9:1206. [PMID: 30271412 PMCID: PMC6142783 DOI: 10.3389/fpls.2018.01206] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 07/26/2018] [Indexed: 05/07/2023]
Abstract
The two-spotted spider mite (TSSM), Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most polyphagous herbivores, feeding on more than 1,100 plant species. Its wide host range suggests that TSSM has an extraordinary ability to modulate its digestive and xenobiotic physiology. The analysis of the TSSM genome revealed the expansion of gene families that encode proteins involved in digestion and detoxification, many of which were associated with mite responses to host shifts. The majority of plant defense compounds that directly impact mite fitness are ingested. They interface mite compounds aimed at counteracting their effect in the gut. Despite several detailed ultrastructural studies, our knowledge of the TSSM digestive tract that is needed to support the functional analysis of digestive and detoxification physiology is lacking. Here, using a variety of histological and microscopy techniques, and a diversity of tracer dyes, we describe the organization and properties of the TSSM alimentary system. We define the cellular nature of floating vesicles in the midgut lumen that are proposed to be the site of intracellular digestion of plant macromolecules. In addition, by following the TSSM's ability to intake compounds of defined sizes, we determine a cut off size for the ingestible particles. Moreover, we demonstrate the existence of a distinct filtering function between midgut compartments which enables separation of molecules by size. Furthermore, we broadly define the spatial distribution of the expression domains of genes involved in digestion and detoxification. Finally, we discuss the relative simplicity of the spider mite digestive system in the context of mite's digestive and xenobiotic physiology, and consequences it has on the effectiveness of plant defenses.
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Affiliation(s)
- Nicolas Bensoussan
- Department of Biology, The University of Western Ontario, London, ON, Canada
| | - Vladimir Zhurov
- Department of Biology, The University of Western Ontario, London, ON, Canada
| | - Sota Yamakawa
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Caroline H. O'Neil
- Robarts Research Institute, The University of Western Ontario, London, ON, Canada
| | - Takeshi Suzuki
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Miodrag Grbić
- Department of Biology, The University of Western Ontario, London, ON, Canada
| | - Vojislava Grbić
- Department of Biology, The University of Western Ontario, London, ON, Canada
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Mondal M, Mansfield K, Flynt A. siRNAs and piRNAs collaborate for transposon control in the two-spotted spider mite. RNA (NEW YORK, N.Y.) 2018; 24:899-907. [PMID: 29678924 PMCID: PMC6004056 DOI: 10.1261/rna.065839.118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 04/16/2018] [Indexed: 05/11/2023]
Abstract
RNAi has revolutionized genetic research, and is being commercialized as an insect pest control technology. Mechanisms exploited for this purpose are antiviral and therefore rapidly evolving. Ideally, RNAi will also be used for noninsect pests; however, differences in RNAi biology make this uncertain. Tetranychus urticae (two-spotted spider mite) is a destructive noninsect pest, which has a proclivity to develop pesticide resistance. Here we provide a comprehensive study of the endogenous RNAi pathways of spider mites to inform design of exogenous RNAi triggers. This effort revealed unexpected roles for small RNAs and novel genome surveillance pathways. Spider mites have an expanded RNAi machinery relative to insects, encoding RNA dependent RNA polymerase (Rdrp) and extra Piwi-class effectors. Through analyzing T. urticae transcriptome data we explored small RNA biogenesis, and discovered five siRNA loci that appear central to genome surveillance. These RNAs are expressed in the gonad, which we hypothesize to trigger production of piRNAs for control of transposable elements (TEs). This work highlights the need to investigate endogenous RNAi biology as lessons from model organisms may not hold in other species, impacting development of an RNAi strategy.
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Affiliation(s)
- Mosharrof Mondal
- Department of Biological Sciences, The University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA
| | - Kody Mansfield
- Department of Biological Sciences, The University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA
| | - Alex Flynt
- Department of Biological Sciences, The University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA
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