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Tomato severe rugose virus: potential of susceptible species as source of virus inoculum, vertical and horizontal transmission by B. tabaci MEAM1 and selection of mild strains for pre-immunization in tomato

Grant number: 18/01633-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2018
Effective date (End): February 28, 2021
Field of knowledge:Agronomical Sciences - Agronomy
Principal Investigator:Jorge Alberto Marques Rezende
Grantee:Gabriel Madoglio Favara
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated research grant:12/51771-4 - Begomovirus and Crinivirus in Solanaceae: molecular epidemiology and management strategies, AP.TEM

Abstract

Tomato crops are susceptible to several species of virus belonging to the genus Begomovirus. Tomato Severe Rugose Virus (ToSRV) is one of the most important species in Brazil because it predominates in tomato main producing regions of this country and causes economic damages to production. ToSRV is transmitted in a circulative persistent manner by the whitefly Bemisia tabaci MEAM1. In addition, ToSRV has a wide host range including weeds and cultivated plants. These alternative hosts can act as reservoirs of the virus in the field. Although not very often, there is Begomovirus specie that can be transmitted to the progeny of B. tabaci, via transovarial and also among adults, via mating, as demonstrated for Tomato Yellow Leaf Curl Virus. This may be important in the epidemiology of the disease, since the viral inoculum remains in the vector, even in the absence of virus host plants. Despite the use of resistant cultivars and the constant application of insecticides for vector control, the disease associated with ToSRV occurs at high incidence in tomato crops. These facts justify the importance of improving knowledge about the epidemiology of the disease and the virus-vector relationships to allow the development of alternative management measures of this disease. The objectives of this work will be: to evaluate the potential of ToSRV susceptible species as source of virus inoculum; to verify the transovarial transmission and via mating of ToSRV by B. tabaci MEAM1; search for mild strains of ToSRV and carry out pre-immunization tests on tomato. The results obtained will provide important information that can be used to manage this disease more efficiently in tomato crops. (AU)