1887

Abstract

The cassava hornworm (Lepidoptera: Sphingidae) is an important pest in Brazil. This insect feeds on host plants of several species, especially (cassava) and (rubber tree). Cassava hornworm outbreaks are quite common in Brazil and can cause great impact over crop production. Granulare and polyhedral-shaped occlusion bodies (OBs) were observed in extracts of dead larvae from rubber-tree plantations by light and scanning electron microscopy (SEM), suggesting a mixed infection. The polyhedral-shaped OB surface revealed indentations that resemble those found in cypovirus polyhedra. After OB nucleic acid extraction followed by cDNA production and Illumina deep-sequencing analysis, the results confirmed for the presence of a putative novel cypovirus that carries ten segments and also a betabaculovirus (Erinnyis ello granulovirus, ErelGV). Phylogenetic analysis of the predicted segment 1-enconded RdRP showed that the new cypovirus isolate is closely related to a member of species , which was isolated from (Lepidoptera: Nymphalidae). Therefore, we named this new isolate Erinnyis ello cypovirus 2 (ErelCPV-2). Genome analyses showed that ErelCPV-2 segment 8 (S8) has a predicted amino acid identity of 35.82 % to a hypothetical protein of betabaculoviruses. This putative protein has a cGAMP-specific nuclease domain related to the poxvirus immune nucleases (poxins) from the 2′,3′-cGAMP-degrading enzyme family.

Funding
This study was supported by the:
  • Bergmann Morais Ribeiro , Conselho Nacional de Desenvolvimento Científico e Tecnológico , (Award 305756/2017-6)
  • Bergmann Morais Ribeiro , Fundação de Apoio à Pesquisa do Distrito Federal , (Award 193.001532/2016)
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/content/journal/jgv/10.1099/jgv.0.001413
2020-04-30
2020-06-04
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