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Decker-Franco C, Taibo CB, Di Rienzo JA, Alfonso V, Arneodo JD. Comparative Pathogenesis of Generalist AcMNPV and Specific RanuNPV in Larvae of Rachiplusia nu (Lepidoptera: Noctuidae) Following Single and Mixed Inoculations. JOURNAL OF ECONOMIC ENTOMOLOGY 2021; 114:1009-1014. [PMID: 33604661 DOI: 10.1093/jee/toab010] [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: 11/03/2020] [Indexed: 06/12/2023]
Abstract
The South American soybean pest, Rachiplusia nu (Guenée), is naturally infected by Autographa californica multiple nucleopolyhedrovirus (AcMNPV) and Rachiplusia nu nucleopolyhedrovirus (RanuNPV). We compared their pathogenicity to fourth-instar R. nu larvae, by evaluating time to death and virus spread throughout the tissues in single and mixed infections. Bioassays showed that generalist AcMNPV had a faster speed of kill than specific RanuNPV, while the mixed-virus treatment did not statistically differ from AcMNPV alone. Histopathology evidenced similar tissue tropism for both viruses, but co-inoculation resulted in mostly AcMNPV-infected cells. In sequential inoculations, however, the first virus administered predominated over the second one. Implications on baculovirus interactions and biocontrol potential are discussed.
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Affiliation(s)
- Cecilia Decker-Franco
- Instituto de Microbiología y Zoología Agrícola (IMyZA), Centro de Investigaciones en Ciencias Veterinarias y Agronómicas (CICVyA), Instituto Nacional de Tecnología Agropecuaria (INTA), Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
| | - Catalina B Taibo
- Laboratorio de Microscopía, CICVyA, INTA, Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
| | - Julio A Di Rienzo
- Cátedra de Estadística y Biometría, Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba, 5000 Córdoba, Argentina
| | - Victoria Alfonso
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
- Instituto de Biotecnología (IB), CICVyA, INTA, Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
| | - Joel D Arneodo
- Instituto de Microbiología y Zoología Agrícola (IMyZA), Centro de Investigaciones en Ciencias Veterinarias y Agronómicas (CICVyA), Instituto Nacional de Tecnología Agropecuaria (INTA), Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Nicolás Repetto y de los Reseros s/n, 1686 Hurlingham, Argentina
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Zwart MP, Van Der Werf W, Van Oers MM, Hemerik L, Van Lent JMV, De Visser JAGM, Vlak JM, Cory JS. Mixed infections and the competitive fitness of faster-acting genetically modified viruses. Evol Appl 2009; 2:209-21. [PMID: 25567862 PMCID: PMC3352374 DOI: 10.1111/j.1752-4571.2008.00058.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2008] [Accepted: 11/28/2008] [Indexed: 11/28/2022] Open
Abstract
Faster-acting recombinant baculoviruses have shown potential for improved suppression of insect pests, but their ecological impact on target and nontarget hosts and naturally occurring pathogens needs to be assessed. Previous studies have focused on the fitness of recombinants at the between-hosts level. However, the population structure of the transmission stages will also be decided by within-host selection. Here we have experimentally quantified the within-host competitive fitness of a fast-acting recombinant Autographa californica multicapsid nucleopolyhedrovirus missing the endogenous egt gene (vEGTDEL), by means of direct competition in single- and serial-passage experiments with its parental virus. Quantitative real-time PCR was employed to determine the ratio of these two viruses in passaged mixtures. We found that vEGTDEL had reduced within-host fitness: per passage the ratio of wild type to vEGTDEL was on average enhanced by a factor of 1.53 (single passage) and 1.68 (serial passage). There is also frequency-dependence: the higher the frequency of vEGTDEL, the stronger the selection against it is. Additionally, the virus ratio is a predictor of time to host death and virus yield. Our results show that egt is important to within-host fitness and allow for a more complete assessment of the ecological impact of recombinant baculovirus release.
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Affiliation(s)
- Mark P Zwart
- Laboratory of Virology, Wageningen University Wageningen, The Netherlands ; Laboratory of Genetics, Wageningen University Wageningen, The Netherlands
| | - Wopke Van Der Werf
- Crop and Weed Ecology Group, Wageningen University Wageningen, The Netherlands
| | - Monique M Van Oers
- Laboratory of Virology, Wageningen University Wageningen, The Netherlands
| | - Lia Hemerik
- Biometris, Wageningen University Wageningen, The Netherlands
| | - Jan M V Van Lent
- Laboratory of Virology, Wageningen University Wageningen, The Netherlands
| | | | - Just M Vlak
- Laboratory of Virology, Wageningen University Wageningen, The Netherlands
| | - Jenny S Cory
- Department of Biology, Algoma University Sault Ste. Marie, Ontario, Canada ; Department of Biological Sciences, Simon Fraser University Burnaby, British Columbia, Canada
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