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The amplifier host hypothesis in the epidemiology of the Golden Mosaic of tomatoes, caused by Tomato Severe Rugose Virus (ToSRV): experimental proof and determination of the conditions of occurrence

Grant number: 20/05563-7
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): June 01, 2021
Effective date (End): May 31, 2023
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal researcher:Jorge Alberto Marques Rezende
Grantee:Vinicius Henrique Bello
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated research grant:18/18274-3 - Begomovirus and crinivirus in solanasceous: regional molecular epidemiology and sustainable integrated management alternatives, AP.TEM

Abstract

Tomato Severe Rugose Virus (ToSRV) is the main begomovirus that affects tomato crops in Brazil. ToSRV is transmitted by the whitefly Bemisia tabaci MEAM1 in a circulative persistent mode. When in high incidence, the losses caused by the begomovirus can reach 100%. The frequent use of insecticides has become the main management approach to control the vector populations present in the field, however, they it is unable to reduce the primary spread, i.e., infection caused by the influx of viruliferous whiteflies coming from external sources of inoculum. High recurrent and localized incidences of ToSRV prompted the existence of amplifier hosts. They occur in high density near the target crop, in a specific place/time and are hosts of the virus and its vectors, providing the necessary force of infection for epidemics to occur. The recent report of ToSRV infecting common bean and soybean, as well as the finding of high infection of tomato plants with ToSRV, in crops near to soybean infected plants with the begomovirus, reinforce the hypothesis of the occurrence and epidemiological importance of the amplifier host. This work has as main objectives the experimental proof and the characterization of the conditions of occurrence of the amplifier host in the tomato-ToSRV pathosystem, aiming to reproduce the occurrence of an epidemic caused by ToSRV in tomato from the virus amplifying host in the field, to provide subsidies for disease management measures. Specific objectives to support the above study will be: to identify and characterize molecularly isolates of ToSRV from different regions of the country; to analyze the susceptibility of soybean and bean genotypes to different isolates of ToSRV and to analyze the effect of the phenological stage of soybean and bean plants on susceptibility to infection with ToSRV. (AU)

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