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Yuan JN, Ye ZX, Chen MN, Ren PP, Ning C, Sun ZT, Chen JP, Zhang CX, Li JM, Mao Q. Identification and Characterization of Three Novel Solemo-like Viruses in the White-Backed Planthopper, Sogatella furcifera. INSECTS 2024; 15:394. [PMID: 38921109 PMCID: PMC11203538 DOI: 10.3390/insects15060394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 05/13/2024] [Accepted: 05/22/2024] [Indexed: 06/27/2024]
Abstract
Agricultural insects play a crucial role in transmitting plant viruses and host a considerable number of insect-specific viruses (ISVs). Among these insects, the white-backed planthoppers (WBPH; Sogatella furcifera, Hemiptera: Delphacidae) are noteworthy rice pests and are responsible for disseminating the southern rice black-streaked dwarf virus (SRBSDV), a significant rice virus. In this study, we analyzed WBPH transcriptome data from public sources and identified three novel viruses. These newly discovered viruses belong to the plant-associated viral family Solemoviridae and were tentatively named Sogatella furcifera solemo-like virus 1-3 (SFSolV1-3). Among them, SFSolV1 exhibited a prevalent existence in different laboratory populations, and its complete genome sequence was obtained using rapid amplification of cDNA ends (RACE) approaches. To investigate the antiviral RNA interference (RNAi) response in WBPH, we conducted an analysis of virus-derived small interfering RNAs (vsiRNAs). The vsiRNAs of SFSolV1 and -2 exhibited typical patterns associated with the host's siRNA-mediated antiviral immunity, with a preference for 21- and 22-nt vsiRNAs derived equally from both the sense and antisense genomic strands. Furthermore, we examined SFSolV1 infection and distribution in WBPH, revealing a significantly higher viral load of SFSolV1 in nymphs' hemolymph compared to other tissues. Additionally, in adult insects, SFSolV1 exhibited higher abundance in male adults than in female adults.
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Affiliation(s)
- Jing-Na Yuan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Zhuang-Xin Ye
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Meng-Nan Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Peng-Peng Ren
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Chao Ning
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Zong-Tao Sun
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Jian-Ping Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
- College of Forestry, Nanjing Forestry University, Nanjing 210037, China
| | - Chuan-Xi Zhang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Jun-Min Li
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
| | - Qianzhuo Mao
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo 315211, China; (J.-N.Y.); (Z.-X.Y.); (M.-N.C.); (P.-P.R.); (C.N.); (Z.-T.S.); (J.-P.C.); (C.-X.Z.); (J.-M.L.)
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Liao A, Cavigliasso F, Savary L, Kawecki TJ. Effects of an entomopathogenic fungus on the reproductive potential of Drosophila males. Ecol Evol 2024; 14:e11242. [PMID: 38590549 PMCID: PMC10999951 DOI: 10.1002/ece3.11242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/20/2024] [Accepted: 03/25/2024] [Indexed: 04/10/2024] Open
Abstract
While mortality is often the primary focus of pathogen virulence, non-lethal consequences, particularly for male reproductive fitness, are less understood; however, they are essential for understanding how sexual selection contributes to promoting resistance. We investigated how the fungal pathogen Metarhizium brunneum affects mating ability, fertility, and seminal fluid protein (SFP) expression of male Drosophila melanogaster paired with highly receptive virgin females in non-competitive settings. Depending on sex and dose, there was a 3-6-day incubation period after infection, followed by an abrupt onset of mortality. Meanwhile, the immune response was strongly induced already 38 h after infection and continued to increase as infection progressed. Latency to mate somewhat increased during the incubation period compared to sham-treated males, but even on Day 5 post infection >90% of infected males mated within 2 h. During the incubation period, M. brunneum infection reduced male reproductive potential (the number of offspring sired without mate limitation) by 11%, with no clear increase over time. Approaching the end of the incubation period, infected males had lower ability to convert number of mating opportunities into number of offspring. After repeated mating, infected males had lower SFP expression than sham controls, more so in males that mated with few mates 24 h earlier. Overall, despite strong activation of the immune response, males' mating ability and fertility remained surprisingly little affected by the fungal infection, even shortly before the onset of mortality. This suggests that the selection for resistance acts mainly through mortality, and the scope for fertility selection to enhance resistance in non-competing settings is rather limited.
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Affiliation(s)
- Aijuan Liao
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
| | - Fanny Cavigliasso
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
| | - Loriane Savary
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
| | - Tadeusz J. Kawecki
- Department of Ecology and EvolutionUniversity of LausanneLausanneSwitzerland
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Hitchcock TJ, Gardner A. Sex-biased demography modulates male harm across the genome. Proc Biol Sci 2021; 288:20212237. [PMID: 34933602 PMCID: PMC8692969 DOI: 10.1098/rspb.2021.2237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 11/26/2021] [Indexed: 11/22/2022] Open
Abstract
Recent years have seen an explosion of theoretical and empirical interest in the role that kin selection plays in shaping patterns of sexual conflict, with a particular focus on male harming traits. However, this work has focused solely on autosomal genes, and as such it remains unclear how demography modulates the evolution of male harm loci occurring in other portions of the genome, such as sex chromosomes and cytoplasmic elements. To investigate this, we extend existing models of sexual conflict for application to these different modes of inheritance. We first analyse the general case, revealing how sex-specific relatedness, reproductive value and the intensity of local competition combine to determine the potential for male harm. We then analyse a series of demographically explicit models, to assess how dispersal, overlapping generations, reproductive skew and the mechanism of population regulation affect sexual conflict across the genome, and drive conflict between nuclear and cytoplasmic genes. We then explore the effects of sex biases in these demographic parameters, showing how they may drive further conflicts between autosomes and sex chromosomes. Finally, we outline how different crossing schemes may be used to identify signatures of these intragenomic conflicts.
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Affiliation(s)
| | - Andy Gardner
- School of Biology, University of St Andrews, St Andrews KY16 9TH, UK
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Brusini J, Wang Y, Matos L, Sylvestre LS, Bolker B, Wayne M. Virulence evolution in a host-parasite system in the absence of viral evolution. EVOLUTIONARY ECOLOGY RESEARCH 2013; 15:883-901. [PMID: 28217033 PMCID: PMC5315458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
QUESTION How does virulence evolve in the Drosophila melanogaster/sigma virus (DMelSV) system? ORGANISMS Drosophila melanogaster (host) and DMelSV (parasite). EMPIRICAL METHODS Artificial selection on whole-carcass viral titre of infected flies, including two selection regimes (maternal and biparental transmission) and three treatments within each regime (increased titre, decreased titre, and control). The maternal transmission selection regime lasted for six generations, while the biparental transmission selection regime lasted for twelve generations. We further quantified virulence by estimating the fecundity, viability, and development time of infected flies. Finally, we sequenced virus strains at the end of selection. PREDICTIONS AND CONCLUSIONS Titre is defined here as the number of viral genomes inside a single fly, while virulence is defined as harm to host. We predicted that titre would respond to both increased and decreased selection, that virulence would evolve as a positively correlated response, and that sequence evolution in the viruses would be responsible for these changes. Titre did respond to selection in the biparental regime, although both high and control lines both demonstrated increased titre, while the titre of the low lines did not change. One component of virulence, development time, was positively correlated with titre in the biparental transmission lines (maternal transmission lines were not scored for virulence). However, we detected few (and in some cases, no) genomic changes in the virus, making viral evolution unlikely to be responsible for the response to selection and the association between development time and titre.
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Affiliation(s)
- J. Brusini
- Department of Biology, University of Florida, Gainesville, Florida, USA
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California, USA
| | - Y. Wang
- Department of Biology, University of Florida, Gainesville, Florida, USA
- Department of Chemistry, University of California, Irvine, California, USA
| | - L.F. Matos
- Department of Biology, Eastern Washington University, Cheney, Washington, USA
| | - L.-S. Sylvestre
- Department of Biology, University of Florida, Gainesville, Florida, USA
| | - B.M. Bolker
- Departments of Mathematics & Statistics and Biology, McMaster University, Hamilton, Ontario, Canada
| | - M.L. Wayne
- Department of Biology, University of Florida, Gainesville, Florida, USA
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