Publicado

2014-07-01

Caracterización morfológica, biológica y genética de un aislamiento Colombiano de granulovirus de Erinnyis ello (L.) (Lepidoptera: Sphingidae)

Characterization of a Colombian isolate of Erinnyis ello granulovirus (L.) (Lepidoptera: Sphingidae)

Palabras clave:

gusano cachón, baculovirus, control biológico, filogenia (es)
hornworm, baculovirus, biological control, biopesticide (en)

Autores/as

  • Gloria Patricia Barrera Cubillos Corpoica
  • Juliana Gómez Corpoica
  • Paola Cuartas Corpoica
  • Guillermo León Corpoica
  • Laura Fernanda Villamizar Rivero Corpoica
El gusano cachón Erinnyis ello (L.) es una plaga polífaga que puede causar graves pérdidas en cultivos de caucho. El uso de granulovirus representa una alternativa interesante para el control biológico de este insecto. Tres aislamientos colombianos del granulovirus de E. ello (EeGV) recuperados en larvas de campo, fueron caracterizados morfológica y molecularmente. Los cuerpos de inclusión de los tres aislamientos presentaron forma ovoide con una única nucleocápside, con tamaño promedio de 302,9 ± 22 x 181,5 ± 16 nm. El análisis de los perfiles de restricción con diferentes endonucleasas no mostró diferencias entre los tres aislamientos, lo cual sugiere que son muestras de la misma cepa viral, denominada VG010, cuyo tamaño del genoma se estimó en 88,7 Kb. El análisis de las relaciones filogenéticas basado en las secuencias de lef-8, lef-9 y gran mostró con alta consistencia la estrecha relación entre VG010 y un aislamiento de EeGV (M34-4) previamente descrito, lo cual sugiere que son variantes genotípicas de la misma especie viral. La eficacia del aislamiento VG010 en condiciones de laboratorio sobre larvas de segundo y cuarto estadio fue de 100 % y 64 % respectivamente, mientras que la concentración letal media (CL50) fue 4,3 x 103 CI/mL. La productividad viral, osciló entre 2,1 x 109 y 3,8 x 109 CI/gramo de larva. Estos resultados representan la base para el desarrollo de un nuevo bioinsecticida para el control de la plaga en campo.
Erinnyis ello (L.) is a polyphagous lepidopteran pest that may cause serious annual losses in the rubber industry. The use of granulovirus represents an interesting alternative as a biological control agent for this insect. Three Colombian isolates of granulovirus for E. ello (EeGV) were obtained from field larvae and characterized at morphological, biological and molecular level. Occlusion bodies (OB) of the three isolates showed an oval morphology with a unique nucleocapsid, with a size of 302.9 ± 22 x 181.5 ± 16 nm. Analysis of DNA endonuclease restriction profiles did not showed differences among the three viral isolates, which means that they correspond to samples of the same viral strain, denominated VG010. The VG010 viral genome size was estimated to be approximately 88.7 kb. The analysis of the phylogenetic relationships based on selected gene sequences lef-8, lef-9 and gran showed a close relationship between VG010 and the previously described isolate EeGV (M34-4). These sequence similarities suggest that the three isolates are genotypic variants of the same viral species. The in vitro efficacy of the VG010 isolate against second and fourth instar larvae was 100 and 64%, respectively, while the mean lethal concentration (LC50) was 4,3 x 103 OB/mL. The viral productivity ranged between 2.1 x 109 and 3.8 x 109 OB/g of larvae. These results represent the basis to develop a new biopesticide control agent for the pest in the field.

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