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Virulence and genetic characterization of six baculovirus strains isolated from different populations of Spodoptera frugiperda (Lepidoptera: Noctuidae)

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Abstract

Fall armyworm (FAW), Spodoptera frugiperda (Smith, 1797), is a polyphagous, voracious, and economically important agricultural pest. Biological control of FAW is a strategy that must be further explored. This study evaluated six baculovirus strains isolated from infected FAW larvae from Mexico, Argentina, Honduras, and the United States. Five alphabaculoviruses (SfNPV-An2, SfNPV-Arg, SfNPV-Fx, SfNPV-Ho, and SfNPV-Sin) and one betabaculovirus (SfGV-RV) were tested against FAW larvae, showing a wide diversity of virulence levels among strains when their estimated LC50s were compared, being SfNPV-Arg, SfNPV-Ho and SfNPV-Fx more virulent than SfNPV-An2, SfNPV-Sin, and SfGV-RV. To determine any virulence difference in vitro studies of these isolates, Sf9 cell cultures were used. Interestingly, only ODVs from four of the test SfNPV strains showed infectivity on Sf9 cell cultures, and some differences in virulence were observed. Genomic restriction analyses and partial sequences of lef-8, lef-9, and polh/granulin genes showed little variability among alphabaculoviruses, both, among them and with previously reported sequences. However, sequences from SfGV-RV were closer to previously reported sequences from the SfGV-VG008 strain than the SfGV-Arg and SfGV-VG014 strains. The great difference in the in vivo virulence was not correlated with great similarity among the isolates. The characterization of these six baculovirus isolates offers the basis for exploring their potential as biological control agents against S. frugiperda, as well the initial studies on their specific infection mechanisms, evolution, and ecology.

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Acknowledgements

We thank Jonatan C. Rangel-Núñez for his technical assistance with all experiments and CONACYT for the ISZ’s fellowship (No. 495732).

Funding

This work was supported by L.E. Studium, Smart Loire Valley Fellowships Programme under the Marie Skłodowska-Curie grant agreement (No. 665790), and Consejo Nacional de Ciencia y Tecnología (CONACYT) grant No. 140615.

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Bioassays, analysis of genes, cell line infections [IZS]; manuscript writing [IAHA]; data analysis of the manuscript [EAH]; data analysis, correction, and revision of manuscript [JEI]; project design, correction, and revision of manuscript [MCRC].

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Correspondence to Ma. Cristina Del Rincón-Castro.

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Authors declare there are no conflicts of interest.

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This manuscript is in compliance with ethical standards. This manuscript does not contain any studies with human participants or animals performed by any of the authors.

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Communicated by Erko Stackebrandt.

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Zanella-Saenz, I., Herniou, E.A., Ibarra, J.E. et al. Virulence and genetic characterization of six baculovirus strains isolated from different populations of Spodoptera frugiperda (Lepidoptera: Noctuidae). Arch Microbiol 204, 108 (2022). https://doi.org/10.1007/s00203-021-02722-8

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  • DOI: https://doi.org/10.1007/s00203-021-02722-8

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