Groundnut ringspot virus

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symptoms of natural infections by the Groundnut ringspot tospovirus on (left) Solanum lycopersicum and (right) Petunia hybrida (click on image to enlarge it)
Authors: A.F. Esquivel, V.M. Camelo-García, J.A.M. Rezende, E.W. Kitajima, L.R. González and H. Sarubbi
Source: Australasian Plant Disease Notes (2019), 14, art. 5
transmission EM image of Petunia hybrida leaf showing Groundnut ringspot tospovirus virions (arrows) (click on image to enlarge it)
Authors: A.F. Esquivel, V.M. Camelo-García, J.A.M. Rezende, E.W. Kitajima, L.R. González and H. Sarubbi
Source: Australasian Plant Disease Notes (2019), 14, art. 5

Groundnut ringspot tospovirus (GRSV)

This virus infects groundnuts, tomatoes and various other plants in the Americas and Africa. Symptoms on groundnut are stunting, smaller and distorted leaves and ringspots. On tomatoes and pepper they have been mainly described as chlorosis, mosaic, ringspots and stem necrosis. The virus can be transmitted by several species of thrips in a circulative-propagative manner. These include Frankliniella occidentalis and F. schultzei.

The genomes of GRSV consists of three RNA segments named small (S), medium (M), and large (L). The RNA of the S segment encodes a nucleocapsid protein and a silencing suppressor protein. The RNA of the M segment encodes a precursor for two glycoproteins and a movement protein. The RNA of the L segment encodes a multifunction protein, with an RNA-dependent RNA polymerase domain.